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Letteratura scientifica selezionata sul tema "High-Current pulse"

Autore: Grafiati

Pubblicato: 7 dicembre 2024

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Articoli di riviste sul tema "High-Current pulse"

1

Godun, D. V., S. V. Bordusau e G. P. Budzko. "Output Current Control System of a High Voltage Electric Pulse Generator for Plasma Excitation". PLASMA PHYSICS AND TECHNOLOGY 6, n. 1 (2019): 7–9. http://dx.doi.org/10.14311/ppt.2019.1.7.

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A control and pulse discharge current limiting system integrated into an AC/DC converter and pulse modulator of a high voltage pulse generator have been developed. The peculiarity of such system\textquotesingle s operation is the stabilization of the power supplied to the discharge and the correction of the width of output electric pulses towards decrease upon reaching the specified pulsed current amplitude value. The system enables the pulse generator to work in the modes close to the ``short circuited load'' mode. In this case the driving module of a composite IGBT key performs the correction of the working pulse width and blocks the pulse generator operation if needed. The suggested circuit design solutions allow using the generator in a wide range of electric plasma-forming parameters' modes and working with various types of vacuum gas discharge systems.

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2

Deke Yan, Deke Yan, Yongsheng Gou Yongsheng Gou, Zhiyuan Song Zhiyuan Song, Chuandong Sun Chuandong Sun e Shaolan Zhu Shaolan Zhu. "Study on the circuit producing high-speed pulse with high peak current". Chinese Optics Letters 9, s1 (2011): s10307–310310. http://dx.doi.org/10.3788/col201109.s10307.

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3

Fan, Xian Guang, Zhen Bang Hu, Ying Jie Xu, Xiu Fen Wang, Xin Wang e Yong Zuo. "Pulsed Driver Control System for High-Power LED". Applied Mechanics and Materials 536-537 (aprile 2014): 1178–82. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1178.

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Pulsed current source is used to drive high-power LED in thermal analysis and testing. A new scheme to design the high-power LED pulsed current source, which integrates FPGA device, with highly quality single-chip microcomputer C8051F as the control center, is introduced. In order to obtain the LED automatic current control, the negative feedback is used in the LED pulsed driver. The pulsed current source consists of constant-current source and couple output interface controlled by square pulse signal, which ensures the stability of pulsed current, rise time and fall time. It is convenient to adjust the pulse current amplitude, pulse width, pulse cycle and sampling gate independently. Results show that the current stability of the driver control system can obtain 0.01%.

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4

Hu, L., B. Gao, J. K. Lv, S. C. Sun, Y. Hao e G. F. Tu. "Halo Evolution of Hypereutectic Al-17.5Si Alloy Treated with High-Current Pulsed Electron Beam". Journal of Nanomaterials 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/806151.

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Halo evolution of an Al-17.5Si alloy surface after treatment with increasing pulse numbers of a high-current pulsed electron beam (HCPEB) was investigated. A halo is a ring microstructure resembling a bull’s eye. SEM results indicate that the nanocrystallization of halo induced by HCPEB treatment leads to gradual diffusion of the Si phase. Multiple pulses numbers cause the Si phase to be significantly refined and uniformly distributed. In addition, nanosilicon particles with a grain size of 30~100 nm were formed after HCPEB treatment, as shown by TEM observation. XRD results indicate that Si diffraction peaks broadened after HCPEB treatment. The microhardness tests demonstrate that the microhardness at the midpoint from the halo edge to center decreased sharply from 9770.7 MPa at 5 pulses to 2664.14 MPa at 25 pulses. The relative wear resistance of a 15-pulse sample is effectively improved by a factor of 6.5, exhibiting optimal wear resistance.

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5

Sun, Yue, Kui Li, Bo Gao, Pengyue Sun, Haiyang Fu, Zhuang Liu e Juntai Yin. "Study on microstructure and wear resistance of Zr-17Nb alloy irradiated by high current pulsed electron beam". REVIEWS ON ADVANCED MATERIALS SCIENCE 59, n. 1 (6 novembre 2020): 514–22. http://dx.doi.org/10.1515/rams-2020-0047.

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AbstractIn this paper, the microstructure and wear resistance of Zr-17Nb alloy treated by high current pulsed electron beam were studied in detail. A phase change occurs after pulse treatments using X-Ray Diffraction (XRD) analysis, showing β (Nb) phase and α (Zr) phase transformed by a part of β (Zr, Nb) phase. Also, narrowing and shifting of β (Zr, Nb) diffraction peaks were found. Scanning Electron Microscope (SEM) and metallographic analysis results reveal that the microstructure of alloy surface before high current pulsed electron beam (HCPEB) treatment is composed of equiaxed crystals. But, after 15 and 30 pulse treatments, crater structures are significantly reduced. Besides, it was also found that the alloy surface has undergone eutectoid transformation after 30 pulse treatments, and the reaction of β (Zr, Nb) → αZr + βNb had occurred. Microhardness test results show that microhardness value presents a downward trend as the number of pulses increases, which is mainly due to the coarsening of the grains and the formation of a softer β (Nb) phase after phase transformation. The wear resistance test results show that the friction coefficient increases first, then decreases and then increases with the increase of pulse number.

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6

Kuznetsov, V. A., G. D. Polkovnikov, V. E. Gromov, V. A. Kuznetsova e O. A. Peregudov. "High power current pulse generator based on reversible thyristor converter". Izvestiya. Ferrous Metallurgy 62, n. 12 (15 gennaio 2020): 964–71. http://dx.doi.org/10.17073/0368-0797-2019-12-964-971.

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In metal forming using high power current pulses, it becomes necessary to control both reproduction frequency and pulse amplitude. Description of a generator of high power current pulses with controlled thyristor converter is provided as a power source of charging device (charger) for regulating voltage (pulse amplitude) of capacitor charge. Faults of the generators associated with inrush current in capacitor charge modes are revealed, which reduces quality of supply network. To reduce time of transient processes while lowering voltage across capacitors, application of reverse thyristor converter is applied as a power source. Structural diagram of generator is considered, which includes reversible thyristor converter with separate control, power unit, capacitor recharge device, charger parameters automatic control system and capacitor charge process control system. Calculation of parameters of automatic control system regulators is presented. To obtain optimal transients, standard methodology for setting regulators to a modular optimum was used. In order to reduce overshoot at time of disturbances appearance, which can reach 100 % and higher, socalled logical device was introduced into the automatic control system. It blocks control pulses on thyristors of converter and simultaneously reduces signal at the output of current regulator to zero. Simulation model of high power current pulse generator in MatLab – Simulink environment was synthesized. Analysis of the model was carried out, and graphs are given that explain principle of device operation and transition processes under various operating modes. Generator application will allow user to adjust amplitude of current pulses with high speed and to obtain sufficiently high-quality transient processes of capacitors charge (discharge), which will have beneficial effect on supply network. Application of better converters will significantly increase frequency of reproduction of current pulses.

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7

Park, Hyeong-Gyu, Beom-Soo Kang e Jeong Kim. "Numerical Modeling and Experimental Verification for High-Speed Forming of Al5052 with Single Current Pulse". Metals 9, n. 12 (5 dicembre 2019): 1311. http://dx.doi.org/10.3390/met9121311.

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Application of electric current pulses during plastic deformation changes the mechanical behavior owing to the electro-plastic effect. The effect of electric current pulses on the Al5052 alloy is investigated in this study. In order to demonstrate the advantages of passing electric current pulses through a metal sheet during the forming process, a uniaxial tensile test with an electric current pulse was carried out using a self-designed device; this device can apply a 2-kA electric current pulse to the specimen for a short period (>100ms). The electric current increases the temperature of the specimen due to Joule heating. It is, therefore, necessary to decouple the thermal effect from the overall behavior to understand only the contribution of electric current in the mechanical behavior. Firstly, an electro-thermo-mechanical finite element study of an electrically assisted uniaxial tensile test of Al5052 alloy is performed to isolate the thermal effect. The simulated results yielded the thermal effect due to the electric current. By comparing the experimental and simulated results, the contribution of electric current is decoupled from that of thermal effect. The electric current-dependent material model is implemented into the commercial FEM code LS-DYNA using user-defined material(UMAT) subroutine. The electric current-dependent material model was used to simulate the electro-mechanical finite element analysis of the high-speed forming of an aluminum sheet with electric current pulse. Simulation results were compared with experimental results at several applied electric currents to evaluate the accuracy of the UMAT. The present work can be utilized to develop simpler constitutive models for the mechanical behavior of metals subjected to a pulsed electric current.

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8

Wei, Xianqi, Xiaoli Wang, Xin Li e Weihua Liu. "Electronic Pulses from Pulsed Field Emission of CNT Cathodes". Journal of Nanomaterials 2018 (2018): 1–6. http://dx.doi.org/10.1155/2018/4396430.

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We presented a demonstration of infrared laser irradiated field emission electronic pulse based on carbon nanotube (CNT) cathodes. Electronic pulses greatly depended on pulsed infrared laser and were almost synchronous with laser pulses. We have designed a pulsed field emission cathode based on CNTs and investigated correlation between electronic pulse and laser pulse, acquiring the shortest width of electronic pulses about 50 ms and turn-on field less than 0.14 V/μm. Besides, we have studied the thermal effect on the pulsed field emission of CNT cathodes caused by laser heating. Interestingly, the thermal effect has caused an enhancement of emission current but resulted in a waveform distortion on short electronic pulses. The application of laser pulses on CNT cathodes would extend conventional electron sources to a pulsed electron source and offered a possibility of pulsed field emission. These results were encouraging us to prepare further studies of ultrafast electronic pulses for high-frequency electron sources.

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9

Kandratsyeu, Aleh, Uladzimir Sabaleuski, Luis Redondo e Andrei G. Pakhomov. "Four Channel 6.5 kV, 65 A, 100 ns–100 µs Generator with Advanced Control of Pulse and Burst Protocols for Biomedical and Biotechnological Applications". Applied Sciences 11, n. 24 (11 dicembre 2021): 11782. http://dx.doi.org/10.3390/app112411782.

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Pulsed electric fields in the sub-microsecond range are being increasingly used in biomedical and biotechnology applications, where the demand for high-voltage and high-frequency pulse generators with enhanced performance and pulse flexibility is pushing the limits of pulse power solid state technology. In the scope of this article, a new pulsed generator, which includes four independent MOSFET based Marx modulators, operating individually or combined, controlled from a computer user interface, is described. The generator is capable of applying different pulse shapes, from unipolar to bipolar pulses into biological loads, in symmetric and asymmetric modes, with voltages up to 6.5 kV and currents up to 65 A, in pulse widths from 100 ns to 100 µs, including short-circuit protection, current and voltage monitoring. This new scientific tool can open new research possibility due to the flexibility it provides in pulse generation, particularly in adjusting pulse width, polarity, and amplitude from pulse-to-pulse. It also permits operating in burst mode up to 5 MHz in four independent channels, for example in the application of synchronized asymmetric bipolar pulses, which is shown together with other characteristics of the generator.

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10

Fathimulla, A., H. Hier e J. Abrahams. "High-current pulse-doped GaInAs MESFET". Electronics Letters 24, n. 8 (1988): 498. http://dx.doi.org/10.1049/el:19880338.

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Più fonti

Tesi sul tema "High-Current pulse"

1

Palomera-Arias, Rogelio 1972. "PIN diode switch circuit for short time high current pulse signal". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47505.

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2

Lanz, B. (Brigitte). "Compact current pulse-pumped GaAs–AlGaAs laser diode structures for generating high peak-power (1–50 watt) picosecond-range single optical pulses". Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526213569.

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Abstract Although gain-switching is a simple, well-established technique for obtaining ultrashort optical pulses generated with laser diodes, the optical energy in a pulse achievable from commercial structures using this technique is no more than moderate and the ‘spiking’ behaviour seen at turn-on is likely to evolve into trailing oscillations. This thesis investigates, develops and improves laser diodes in order to offer experimentally verified solutions for maximizing the optical energy so as to achieve a peak power of several watts in a single optical pulse of picosecond-range duration in the gain-switching operation regime, and for suppressing the energy located in any trailing pulses to a negligible level relative to the total optical pulse energy. This was addressed by means of either (i) an ultrashort pump current pulse with an amplitude range ~(1–10) A or (ii) custom laser diode structures, both options being capable of operating uncooled at room temperature (23±3°C). For the first solution a unique superfast gallium arsenide (GaAs) avalanche transistor was utilized as a switch in order to achieve an injection current pulse with a duration of < 1 ns, which is short enough to generate only a first optical ‘spike’ when pumping a commercial laser diode. The most promising structure with regard to the second solution was an edge-emitting semiconductor laser having a strongly asymmetric broadened double heterostructure with a relatively thick active layer. Laser pulses with full width at half maximum (FWHM) of ~100 ps and an optical energy of >3 nJ but with some trailing oscillations were achieved in experiments employing injection current pulses in the nanosecond range with an amplitude of ≤17 A, generated using inexpensive silicon (Si) electronics. The performance was improved by introducing a saturable absorber (SA) into the laser cavity, which suppressed the formation of trailing oscillations, resulting in a single optical pulse
Tiivistelmä ”Gain switching” (vahvistuskytkentä) on tunnettu tekniikka lyhyiden (<100 ps) optisten pulssien generoimiseen laserdiodeilla. Kaupallisia laserdiodirakenteita käyttäen optinen energia rajoittuu kuitenkin 10…100 pJ:n tasolle. Tällöinkin, erityisesti suurilla energiatasoilla, optisessa pulssissa ilmenee voimakkaita jälkioskillaatioita. Tässä väitöskirjassa tutkittiin ja kehitettiin kokeellisesti varmennettuja laserdiodilähetinrakenteita tavoitteena saavuttaa >1 nJ:n optisen pulssin energia ja ~100 ps:n pulssinpituus gain-switching -toimintamoodissa. Tavoitteena oli myös minimoida jälkipulssien energia. Tutkimuksen pääsisältönä on kaksi toimintaperiaatetta: Toisessa tekniikassa päähuomio kohdistuu laseridiodin virta-ajuriin, johon kehitettiin elektroniikka, joka kykenee tuottamaan nopeita virtapulsseja laajalla pulssivirta-alueella. Virtapulssin nopeuden kasvattamisen (<1 ns) osoitettiin edistävän gain switching -ilmiötä. Toisena tekniikkana tutkittiin räätälöityä laserdiodirakennetta, joka sisäisen toimintansa perusteella tuottaa dynaamisessa ohjaustilanteessa tehokkaan ja nopean laserpulssin. Kummankin periaatteen osoitettiin toimivan huonelämpötilassa (23±3°C) ilman erillistä jäähdytystä. Ensimmäisessä ratkaisussa käytettiin nopeaa gallium-arsenidi (GaAs) -avalanchetransistoria virtakytkimenä, jolla saavutettiin <1 ns FWHM injektiovirtapulssi 10 A:n virtatasolla. Tällainen virtapulssi on riittävän lyhyt virittämään ”gain switching” -ilmiön nJ-energiatasolla. Lupaavin rakenne toiseksi ratkaisuksi oli reunaemittoiva puolijohdelaseri, jossa epäsymmetrinen aaltoputki ja aktiivinen alue ovat sijoitettu normaalista laserdiodirakenteesta poiketen rinnakkain. Tällä rakenteella voitiin tuottaa ~100 ps levyisiä (FWHM) ja >3 nJ optisen kokonaisenergian omavia laserpulsseja edullisella pii-pohjaisella (Si) elektroniikalla luoduilla 1.5–2 ns:n (FWHM) ≤17 A injektiovirtapulsseilla. Suorituskykyä saatiin edelleen parannettua istuttamalla saturoiva absorbaattori (SA) laserin optiseen onteloon. Tämän osoitettiin vähentävän jälkioskillaatioiden muodostumista

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3

Bendixsen, Luis Sebastian Caballero. "The design and construction of a compact, high-current pulsed power generator based on multiple low impedance pulse forming lines and networks". Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526548.

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4

Bloomfield, Aaron Paul. "A High Frequency Alternating Current Battery Heater for Military Vehicles". University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302312903.

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5

Gamir, Luis Palafox. "A new method for the determination of the entry position of #gamma#-rays in high purity germanium detectors by current pulse analysis". Thesis, Cranfield University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387640.

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6

Palafox, Gamir Luis. "A new method for the determination of the entry position of γ-rays [gamma rays] in high purity germanium detectors by current pulse analysis". Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/850.

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Abstract (sommario):

A new method for determining the entry point of gamma-rays in closed ended HPGe detectors has been developed. Exploiting the position dependence shown by the current pulses generated when a gamma-ray interacts with the detector, it is possible to electronically divide the crystal in the radial coordinate and thus increase the effective granularity of the detector. Position resolution is particularly important for correcting the Doppler peak broadening observed in many in-beam gamma-spectroscopy experiments. Position resolution within coaxial crystals is accomplished by combining the angular information gained by segmenting the outer contact with the determination of the event radius by current pulse shape analysis. With increasing gamma-energy, more than one interaction is in general required to completely stop a gamma-ray in a germanium detector. The concept of a main interaction, defined as that depositing the largest fraction of the original gamma-energy, is introduced and seen to be the dominant contribution to the event current pulses. A Monte Carlo simulation for the positions and energies of the interactions in an event has been performed in order to establish the physical limits for the position resolution that can be measured in a segmented CLUSTER module. A varying fraction of events, from 55% at a gamma-energy of 400 keV to 85% at 1800 keV, have their main interaction within 5 mm from the entry point. The position of the main interaction can therefore be successfully used to measure the entry position of the gamma-ray in the detector. In order to provide high quality charge/energy and current outputs from the detector signal, a new preamplifier for large volume HPGe detectors has been developed. The intrinsic equivalent noise contribution from the preamplifier was measured at 0.65 keV + 35 eV /pF. The measured energy resolution when the input FET is operated at cryogenic temperature is 2.30 keV at 1333 keV with 3 μs shaping time. Using this preamplifier and the first prototype of a two-fold segmented CLUSTER module, a radial resolution of ±4mm has been measured with the new method both at 662 and 1333 keV. The method can be incorporated into an analogue electronic circuit and is therefore directly applicable in in-beam gamma-spectroscopy experiments.

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7

Palafox, Gamir Luis. "A new method for the determination of the entry position of y-rays [gamma rays] in high purity germanium detectors by current pulse analysis". Thesis, Cranfield University, 1997. http://hdl.handle.net/1826/850.

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Abstract (sommario):

A new method for determining the entry point of gamma-rays in closed ended HPGe detectors has been developed. Exploiting the position dependence shown by the current pulses generated when a gamma-ray interacts with the detector, it is possible to electronically divide the crystal in the radial coordinate and thus increase the effective granularity of the detector. Position resolution is particularly important for correcting the Doppler peak broadening observed in many in-beam gamma-spectroscopy experiments. Position resolution within coaxial crystals is accomplished by combining the angular information gained by segmenting the outer contact with the determination of the event radius by current pulse shape analysis. With increasing gamma-energy, more than one interaction is in general required to completely stop a gamma-ray in a germanium detector. The concept of a main interaction, defined as that depositing the largest fraction of the original gamma-energy, is introduced and seen to be the dominant contribution to the event current pulses. A Monte Carlo simulation for the positions and energies of the interactions in an event has been performed in order to establish the physical limits for the position resolution that can be measured in a segmented CLUSTER module. A varying fraction of events, from 55% at a gamma-energy of 400 keV to 85% at 1800 keV, have their main interaction within 5 mm from the entry point. The position of the main interaction can therefore be successfully used to measure the entry position of the gamma-ray in the detector. In order to provide high quality charge/energy and current outputs from the detector signal, a new preamplifier for large volume HPGe detectors has been developed. The intrinsic equivalent noise contribution from the preamplifier was measured at 0.65 keV + 35 eV /pF. The measured energy resolution when the input FET is operated at cryogenic temperature is 2.30 keV at 1333 keV with 3 μs shaping time. Using this preamplifier and the first prototype of a two-fold segmented CLUSTER module, a radial resolution of ±4mm has been measured with the new method both at 662 and 1333 keV. The method can be incorporated into an analogue electronic circuit and is therefore directly applicable in in-beam gamma- spectroscopy experiments.

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8

Hinde, David Derek. "Corona discharges on the surfaces of high voltage composite insulators". Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/29320/2/David_Hinde_Thesis.pdf.

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The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage electricity networks. Little information is known about the system of localized degradation from corona discharges on the relatively new silicone rubber sheathed composite insulators that are now being widely used in high voltage applications. This current work focuses on the fundamental principles of electrical corona discharge phenomena to provide further insights to where damaging surface discharges may localize and examines how these discharges may degrade the silicone rubber material. Although water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation until now no thorough studies have been made of this phenomenon. Results from systematic measurements taken using modern digital instrumentation to simultaneously record the discharge current pulses and visible images associated with corona discharges from between metal electrodes, metal electrodes and water drops, and between waters drops on the surface of silicone rubber insulation, using a range of 50 Hz voltages are inter compared. Visual images of wet electrodes show how water drops can play a part in encouraging flashover, and the first reproducible visual images of water drop corona at the triple junction of water air and silicone rubber insulation are presented. A study of the atomic emission spectra of the corona produced by the discharge from its onset up to and including spark-over, using a high resolution digital spectrometer with a fiber optic probe, provides further understanding of the roles of the active species of atoms and molecules produced by the discharge that may be responsible for not only for chemical changes of insulator surfaces, but may also contribute to the degradation of the metal fittings that support the high voltage insulators. Examples of real insulators and further work specific to the electrical power industry are discussed. A new design concept to prevent/reduce the damaging effects of water drop corona is also presented.

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9

Hinde, David Derek. "Corona discharges on the surfaces of high voltage composite insulators". Queensland University of Technology, 2009. http://eprints.qut.edu.au/29320/.

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Abstract (sommario):

The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage electricity networks. Little information is known about the system of localized degradation from corona discharges on the relatively new silicone rubber sheathed composite insulators that are now being widely used in high voltage applications. This current work focuses on the fundamental principles of electrical corona discharge phenomena to provide further insights to where damaging surface discharges may localize and examines how these discharges may degrade the silicone rubber material. Although water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation until now no thorough studies have been made of this phenomenon. Results from systematic measurements taken using modern digital instrumentation to simultaneously record the discharge current pulses and visible images associated with corona discharges from between metal electrodes, metal electrodes and water drops, and between waters drops on the surface of silicone rubber insulation, using a range of 50 Hz voltages are inter compared. Visual images of wet electrodes show how water drops can play a part in encouraging flashover, and the first reproducible visual images of water drop corona at the triple junction of water air and silicone rubber insulation are presented. A study of the atomic emission spectra of the corona produced by the discharge from its onset up to and including spark-over, using a high resolution digital spectrometer with a fiber optic probe, provides further understanding of the roles of the active species of atoms and molecules produced by the discharge that may be responsible for not only for chemical changes of insulator surfaces, but may also contribute to the degradation of the metal fittings that support the high voltage insulators. Examples of real insulators and further work specific to the electrical power industry are discussed. A new design concept to prevent/reduce the damaging effects of water drop corona is also presented.

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10

Shahriari, Ejlal. "Commutateurs à semi-conducteurs rapides et à courant élevé pour les applications de puissance pulsée". Electronic Thesis or Diss., Pau, 2024. https://theses.hal.science/tel-04818494.

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Abstract (sommario):

Des impulsions de courant d'amplitude élevée (plusieurs centaines de kA) dans la gamme des microsecondes peuvent être appliquées pour générer des champs magnétiques de l'ordre du mégagauss. Cette technologie relative au domaine des haute puissances pulsées a été utilisée pour des travaux de recherche sur la fusion par confinement inertiel, le X-pinch ou la physique des hautes densités d'énergie. De plus, un certain nombre d'applications industrielles telles que le soudage par impulsion magnétique et la fracturation des roches nécessitent une puissance moyenne élevée, une répétabilité et un générateur d'impulsions de forts courants fiable avec une longue durée de vie. Par conséquent, le développement d'un interrupteur à semi-conducteurs rapide fonctionnant dans la gamme de plusieurs centaines de kA est d'une importance considérable.Un interrupteur rapide à courant élevé est l'un des composants les plus complexes d'un générateur de hautes puissances pulsées. Historiquement, seuls les interrupteurs remplis de gaz pouvaient fonctionner dans de telles conditions extrêmes. Cependant, les interrupteurs remplis de gaz présentent plusieurs inconvénients bien connus, notamment une faible fréquence de répétition des impulsions, une durée de vie courte et une instabilité lors du déclenchement. Ils sont également coûteux à utiliser, nécessitant souvent des systèmes de flux de gaz et des chambres de recirculation de gaz pour une opération répétitive. Ces inconvénients ont freiné l'adoption généralisée des technologies de hautes puissances pulsées.Les récents progrès en physique et technologie des semi-conducteurs ont introduit les interrupteurs à semi-conducteurs dans le domaine des hautes puissances pulsées. En particulier, les structures en silicium à haute tension déclenchées en mode onde d'ionisation par impact représentent une solution prometteuse pour les interrupteurs à semi-conducteurs rapides à très fort courant (dizaines à centaines de kA et gradient de courant de plusieurs dizaines de kA/μs).L'objectif principal de cette thèse est de démontrer expérimentalement la capacité des thyristors à haute tension à commuter rapidement des impulsions de courant d'amplitude élevée. Pour atteindre cet objectif, des études expérimentales et théoriques sont entreprises. Dans les travaux expérimentaux, l'accent principal est porté sur une limitation critique mise en évidence dans la littérature, à savoir la surface de section transversale du thyristor. Pour s'affranchir de cette limitation, plusieurs solutions ont été étudiées dans cette thèse, notamment (i) le déclenchement du plus grand thyristor disponible dans le commerce, d'un diamètre de 100 mm avec une tension de claquage statique de 5,2 kV, (ii) le déclenchement en parallèle d'un ensemble de deux et quatre thyristors à haute tension, (iii) la configuration série-parallèle afin d'augmenter simultanément la tension de blocage et la capacité de courant de l'interrupteur. En termes d'étude théorique, la simulation numérique est réalisée pour apporter une meilleure compréhension des phénomènes de claquage par avalanche en mode de commutation par ionisation d'impact
Micro-second range high-current pulses (100s kA) are applied to generate megagauss-range magnetic fields. This high pulsed power technology has been employed in inertial fusion research, X-pinch, and high-energy-density physics. Moreover, a number of industrial applications such as magnetic pulse welding and rock fracturing require high average power, repeatability, and a reliable high-current pulse generator with a long lifespan. Hence, a fast solid-state switch development operating in the range of several hundred kA is of considerable importance.A fast high-current switch is one of the most complex components in a pulsed power generator. Historically, only gas-filled switches could operate under such extreme conditions. However, gas-filled switches have several well-known disadvantages, including low pulse repetition frequency, short lifetimes, and instability in triggering. They are also expensive to use, often requiring gas flow systems, costly gases, and recirculating chambers of gas for repetitive operation. These disadvantages have hindered the widespread adoption of pulsed power technologies.Recent advancements in semiconductor physics and technology have introduced solid-state switches into the pulsed power domain. In particular, silicon high-voltage structures triggered in impact-ionization wave mode present a promising solution for fast high-current solid-state switches (10s-100s kA and 10s kA/μs).The main goal of this thesis is to experimentally demonstrate the capability of high-voltage thyristors to switch fast-high current pulses. to accomplish this goal, two major axes of study are defined as the experimental and theoretical studies. In the experimental work, the main focus is determined based on a key limitation highlighted in the literature, i.e., the cross-sectional area of the thyristor. To eliminate this limitation several solutions have been investigated in this thesis including (i) triggering the largest commercially available thyristor, 100 mm wafer diameter with 5.2 kV static voltage breakdown. (ii) Parallel triggering of an assembly of two and four high-voltage thyristors. (iii) Series-parallel configuration in order to further increase blocking voltage and current capability of the switch simultaneously. In terms of theoretical study, the numerical simulation is conducted to shed light on the avalanche breakdown phenomena in impact-ionization switching mode

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Libri sul tema "High-Current pulse"

1

Workshop on Short Pulse High Current Cathodes (1990 Bendor, France). Proceedings of the Workshop on Short Pulse High Current Cathodes, Bendor, France, 18-22 June 1990. Gif-sur-Yvette, France: Editions Frontieres, 1990.

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2

Welsh, David S. Current density limitations in a fast-pulsed high-voltage vacuum diode. Monterey, Calif: Naval Postgraduate School, 1992.

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3

Stanton, Bonita. Physics and technology of high current discharges in dense gas media and flows. Hauppauge, N.Y: Nova Science Publishers, 2009.

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4

Wright, A. G. Electronics for PMTs. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199565092.003.0014.

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Photomultipliers (PMTs) are current generators characterized by high gain, wide bandwidth, and high-output impedance. The role of preamplifiers and amplifiers is generally one of conditioning the PMT output. Either the time signature is preserved using a fast voltage preamplifier, or a voltage proportional to the charge in each event is generated with a charge-sensitive preamplifier. Both preamplifier types are generally of low-output impedance, suitable for driving matched coaxial cable. Preamplifiers and amplifiers are available as modular units (e.g. nuclear instrument module), stand alone, or are incorporated in a module including the PMT. Shaping amplifiers are used to further condition preamplifier signals, using integrating and differentiating circuits—particularly relevant to scintillation spectrometers. Discrete-component amplifiers and current-feedback operational amplifiers serve fast applications. Digital signal processing has overtaken many of the classical electronic techniques involving resolution and in pulse shape discrimination. Electronic circuitry for generating fast LED pulses is discussed.

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5

Wright, A. G. Linear performance. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199565092.003.0009.

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This chapter is concerned with a single consideration: the degree of proportionality between a light signal and its resulting electrical output. This is formally referred to as linearity, which depends on the suitability of the chosen PMT and the mode of operation (pulsed or analogue). Applications fall into two groups: analogue operation (DC) and transient applications. Linearity in a pulsed mode of operation concerns both pulse height (charge) and the rate of events. Generally, in the DC mode, only the mean anode current is relevant. Methods for determining both forms of non-linearity are presented, based on actual measurements. Test methods using multiple light sources, bootstrapping, single step (piggyback), and shot noise are investigated. A method for uncovering non-linearity in high-Z scintillators by using coincident gamma emissions (60Co) is demonstrated. An analytical means for correcting results at the 1 % level is provided.

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6

TENS-like devices. Oxford University Press, 2014. http://dx.doi.org/10.1093/med/9780199673278.003.0011.

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TENS-like devices deliver electrical currents across the intact surface of the skin using pulse generators with technical output specifications that differ from a standard TENS device. Technological advances have resulted in reductions in the size and cost of electrotherapeutic devices with increasing varieties of self-administered hand-held TENS-like devices available to practitioners and the general public. The diversity of TENS-like devices available on the market makes synthesizing evidence difficult. The purpose of this chapter is to categorize TENS-like devices and briefly overview the characteristics, mechanism of action, and effectiveness of various TENS-like devices. The chapter covers high-voltage pulsed (Galvanic) current, microcurrent electrical therapy, low-intensity transcutaneous cranial electrical stimulation, transcutaneous spinal electroanalgesia, transcutaneous piezoelectric current, non-invasive interactive neurostimulation, action potential simulation and H-wave therapy, and transcutaneous electrical acupoint stimulation.

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Markov, Marko S., e Sinerik N. Ayrapetyan. Bioelectromagnetics Current Concepts: The Mechanisms of the Biological Effect of Extremely High Power Pulses. Springer, 2006.

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8

Zantis, Franz Peter. Generating of Short Pulses with High Amplitudes by Using of Standard Current-Feedback-Amplifier. GRIN Verlag GmbH, 2014.

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9

Kasprzak, Jaroslaw D., Anita Sadeghpour e Ruxandra Jurcut. Doppler echocardiography. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198726012.003.0003.

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Doppler examination is an integral part of the echocardiogram. Current systems are equipped with spectral Doppler in continuous wave mode (offering measurements of high velocities with limited spatial specificity due to integration of signal along the scan line), pulsed wave mode (high spatial specificity with maximal recordable velocity reduced by the Nyquist limit), and colour Doppler flow mapping (allowing rapid identification of flow pattern within a cross-sectional B-mode sector). Tissue Doppler echocardiography emerged as a basic tool for sampling regional myocardial velocities, in pulsed wave or colour velocity mapping mode. Finally, three-dimensional systems improve spatial presentation of flow phenomena by integrating Doppler-derived flow patterns in three-dimensional datasets.

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10

Wright, A. G. Voltage dividers. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199565092.003.0013.

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Voltage dividers provide accelerating voltages to generate multiplier gain. Dynode voltages must remain constant and independent of the light input to maintain stable gain. The standard resistive divider never quite satisfies this requirement, although acceptable performance can be achieved by careful design. The inclusion of zener diodes improves performance but field-effect transistor (FET) circuits can provide gain stability at high mean anode currents, regardless of whether the application is pulsed or analogue. Design procedures for active and semi-active voltage dividers are presented. Dividers based on the Cockcroft–Walton (CW) principle are particularly suited to portable instrumentation because of their low standing current. Consideration is given to pulsed operation, decoupling, switch-on transients, ripple, dynode signals, single cable dividers, and equivalent circuits at high frequencies. Gating is used to protect a photomultiplier, in the presence of high light levels, by reducing the gain electronically. Various methods for gating a voltage divider are presented.

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Capitoli di libri sul tema "High-Current pulse"

1

Chowdhury, Ankur, Alok K. Saxena e K. D. Joshi. "Coupled Electromagnetic–Structural–Thermal Simulations for Designing High-Current Pulse-Power Inductors for Pulse Shaping of High-Magnitude, Long-Duration Current Pulses". In Lecture Notes in Electrical Engineering, 355–62. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0337-1_35.

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2

Kolacek, K., J. Straus, J. Schmidt, O. Frolov, V. Prukner, J. Sobota, T. Fort e A. Shukurov. "EUV radiation of pulse high-current proximity-wallstabilized discharges". In Springer Proceedings in Physics, 263–68. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1186-0_29.

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3

Shen, Dezhen, e Xiwu Fan. "Free Exciton Emission in ZnSxSe1−x MIS Diodes with High Pulse Current Density". In Springer Proceedings in Physics, 376–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-93430-8_76.

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4

Li, Yuan Yuan, X. Q. Li, Yan Long, Ming Shao e Wei Xia. "Pulse Electric Current Sintering of Iron-Base Powders Prepared by High Energy Milling". In Advances in Machining & Manufacturing Technology VIII, 445–49. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.445.

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5

Zhanhong, Xie, Wu Lizhou, Zhao Yingjie, Gou Xueke, Geng Hao, Zhao Xi e Qiu Qunxian. "Analysis and Test of Influence of MA Pulse High Current on Electromagnetic Vacuum Relay". In Lecture Notes in Electrical Engineering, 527–36. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0451-8_54.

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6

Jiwu, Li, e Cai Weijian. "Comparative Study of Distribution of Collecting Plate Current Density on Electrostatic Precipitations with High Direct Current and Pulse Power Supply". In Electrostatic Precipitation, 337–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_66.

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7

Coeur, F., Y. Arnal, J. Pelletier, O. Lesaint, O. Maulat e M. Roche. "Monoatomic Ion Rich DECR Plasmas for Ion Implantation by Plasma Immersion Using a New High Voltage — High Current Pulse Generator". In Advanced Technologies Based on Wave and Beam Generated Plasmas, 493–94. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-017-0633-9_32.

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8

Tanyag, Rico Mayro P., Bruno Langbehn, Thomas Möller e Daniela Rupp. "X-Ray and XUV Imaging of Helium Nanodroplets". In Topics in Applied Physics, 281–341. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94896-2_7.

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AbstractX-ray and extreme ultraviolet (XUV) coherent diffractive imaging (CDI) have the advantage of producing high resolution images with current spatial resolution of tens of nanometers and temporal resolution of tens of femtoseconds. Modern developments in the production of coherent, ultra-bright, and ultra-short X-ray and XUV pulses have even enabled lensless, single-shot imaging of individual, transient, non-periodic objects. The data collected in this technique are diffraction images, which are intensity distributions of the scattered photons from the object. Superfluid helium droplets are ideal systems to study with CDI, since each droplet is unique on its own. It is also not immediately apparent what shapes the droplets would take or what structures are formed by dopant particles inside the droplet. In this chapter, we review the current state of research on helium droplets using CDI, particularly, the study of droplet shape deformation, the in-situ configurations of dopant nanostructures, and their dynamics after being excited by an intense laser pulse. Since CDI is a rather new technique for helium nanodroplet research, we also give a short introduction on this method and on the different light sources available for X-ray and XUV experiments.

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9

Denman, C. A., e L. A. Schlie. "Sensitive High-Temporal-Resolution Tof Electron Drift Tube; Asymmetrical Current Pulse Observation and Determination of Vd, DLand D3". In Nonequilibrium Effects in Ion and Electron Transport, 359. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0661-0_31.

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10

Dehmollaian, Eshagh, Bernhard Etzlinger, Philipp Peterseil e Andreas Springer. "AI-Enhanced UWB-Based Localisation in Wireless Networks". In Intelligent Secure Trustable Things, 201–16. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-54049-3_12.

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AbstractThanks to low complex and affordable hardware, low power consumption, and pulse-based communication, ultra-wideband (UWB) technology has brought the possibility of positioning in wireless networks for various applications with high precision. Nowadays, the widespread use of this technology for location-based applications together with the integration of this technology in smartphones, motivates more research on the use of this technology for localisation systems. Current research results emphasize that artificial intelligence (AI) algorithms can help to improve the positioning performance of UWB technology due to the use of large amounts of data. In this work, we provide an overview of the challenges and their AI-based solutions in UWB-based localisation systems. This is followed by an overview of related work and an application example.

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Atti di convegni sul tema "High-Current pulse"

1

Leung, Ka-Ngo. "High current short pulse ion sources". In New modes of particle acceleration: Techniques and sources. AIP, 1997. http://dx.doi.org/10.1063/1.52978.

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2

Jones, C. C. R. "High current pulse testing in aircraft lightning clearance". In Pulsed Power Seminar. IEE, 2003. http://dx.doi.org/10.1049/ic:20030073.

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3

Ferrero, R., M. Marracci e B. Tellini. "Analytical study of high pulse current shunts". In 2011 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2011. http://dx.doi.org/10.1109/imtc.2011.5944280.

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4

Nashilevskiy, A. V., G. G. Kanaev, V. I. Krauz, V. V. Myalton, G. E. Remnev e V. P. Vinogradov. "High-current pulse generator for plasma focus". In 2011 IEEE Pulsed Power Conference (PPC). IEEE, 2011. http://dx.doi.org/10.1109/ppc.2011.6191540.

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5

Shoihet, Arthur, Moshe Shvartsas, Beni Gdaliahu e Itzik Edry. "High current short pulse generator for pulse magneto-oscillation (PMO) research". In 2012 IEEE 27th Convention of Electrical & Electronics Engineers in Israel (IEEEI 2012). IEEE, 2012. http://dx.doi.org/10.1109/eeei.2012.6376977.

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Ananyeva, Ludmila, Sergey Ilenok, Mikhail Korovkin, Evgeniy Kumpyak e Andrey Zherlitsyn. "Production of High-Purity Quartz Concentrate by Electrical Pulse Fragmentation". In 2018 20th International Symposium on High-Current Electronics (ISHCE). IEEE, 2018. http://dx.doi.org/10.1109/ishce.2018.8521215.

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7

Hartmann, W. "Design of a high current pulse generator for magnetoforming". In Pulsed Power Seminar. IEE, 2003. http://dx.doi.org/10.1049/ic:20030090.

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8

Obukhov, V. A., A. V. Ovchinnikov, A. F. Piskunkov, A. A. Pertsev e N. P. Shishaev. "High-Speed Macroparticle Destruction in a High-Current Pulse Discharge". In 2008 14th Symposium on Electromagnetic Launch Technology. IEEE, 2008. http://dx.doi.org/10.1109/elt.2008.131.

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9

Schmidt, J., K. Kolacek, O. Frolov, V. Prukner e J. Straus. "High Resolved Spectra of Pulse High Current Capillary Discharge Plasma". In 2008 IEEE International Power Modulators and High Voltage Conference (IPMC). IEEE, 2008. http://dx.doi.org/10.1109/ipmc.2008.4743677.

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Harutyunyan, R. V., e T. R. Harutyunyan. "Simulation of high-current pulse to the electrode". In 2016 International Conference on Actual Problems of Electron Devices Engineering (APEDE). IEEE, 2016. http://dx.doi.org/10.1109/apede.2016.7878973.

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Rapporti di organizzazioni sul tema "High-Current pulse"

1

Leung, K. N. High current short pulse ion sources. Office of Scientific and Technical Information (OSTI), agosto 1996. http://dx.doi.org/10.2172/414414.

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2

Decker, Franz-Josef. High Current, Long Beam Pulse with SLED. Office of Scientific and Technical Information (OSTI), aprile 1999. http://dx.doi.org/10.2172/10200.

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3

Ho, Ching-Hung. A high current, short pulse electron source for wakefield accelerators. Office of Scientific and Technical Information (OSTI), gennaio 1992. http://dx.doi.org/10.2172/7121494.

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4

Ho, Ching-Hung. A high current, short pulse electron source for wakefield accelerators. Office of Scientific and Technical Information (OSTI), gennaio 1992. http://dx.doi.org/10.2172/10115938.

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5

Miller, J. D., R. F. Schneider, H. S. Uhm, K. T. Nguyen e K. W. Struve. Pulse Shaping a High-Current Relativistic Electron Beam in Vacuum. Fort Belvoir, VA: Defense Technical Information Center, giugno 1990. http://dx.doi.org/10.21236/ada230674.

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6

Anders, A., I. Brown, R. MacGill e M. Dickinson. High ion charge states in a high-current, short-pulse, vacuum arc ion source. Office of Scientific and Technical Information (OSTI), settembre 1995. http://dx.doi.org/10.2172/132736.

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7

Wang, Guiding. Development of Long-Pulse Heating and Current Drive Actuators and Operational Techniques Compatible with a High-Z Divertor and First Wall. Office of Scientific and Technical Information (OSTI), novembre 2017. http://dx.doi.org/10.2172/1407405.

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8

Tynan, George. Development of long-pulse heating & current drive actuators & operational techniques compatible with a high-Z divertor & first wall. Office of Scientific and Technical Information (OSTI), gennaio 2018. http://dx.doi.org/10.2172/1416179.

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9

Wukitch, Stephen. Development of long-pulse heating and current drive actuators and operational techniques compatible with a high-Z divertor and first wall. Office of Scientific and Technical Information (OSTI), maggio 2019. http://dx.doi.org/10.2172/1511865.

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10

Mordijck, Saskia. Final Technical Report: Development of long-pulse heating and current drive actuators and operational techniques compatible with a high-Z divertor and first wall. Office of Scientific and Technical Information (OSTI), marzo 2018. http://dx.doi.org/10.2172/1430223.

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