Bibliographies thématiques / RF deflectors

Littérature scientifique sur le sujet « RF deflectors »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "RF deflectors"

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ALESINI, DAVID. « RF DEFLECTOR BASED SUB-PS BEAM DIAGNOSTICS : APPLICATION TO FEL AND ADVANCED ACCELERATORS ». International Journal of Modern Physics A 22, no 22 (10 septembre 2007) : 3693–725. http://dx.doi.org/10.1142/s0217751x07037378.

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RF deflectors are very promising devices for longitudinal and transverse phase space characterization and beam manipulation in advanced accelerators. Measurement setups for longitudinal pulse shape as well as phase space and transverse beam slice emittance characterizations are described as well the main design criteria of traveling wave and standing wave RF deflectors used for beam diagnostics putting in evidence the advantages or disadvantages of the two devices in terms of performances, required power and power limitations.
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Doolittle, L., M. Placidi, P. Emma, A. Ratti, S. U. De Silva, R. G. Olave et J. R. Delayen. « Cascading RF deflectors in compact beam spreader schemes ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 899 (août 2018) : 32–42. http://dx.doi.org/10.1016/j.nima.2018.04.039.

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Otani, M., K. Futatsukawa, K. Hirano, Y. Kondo, A. Miura, H. Oguri et Y. Liu. « Longitudinal bunch size measurement using an RF deflector ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 908 (novembre 2018) : 313–17. http://dx.doi.org/10.1016/j.nima.2018.08.094.

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Jing-Ru, Zhang, Dai Jian-Ping, Gu Qiang, Pei Guo-Xi, Zhao Ming-Hua, Zhong Shao-Peng, Wang Xing-Tao, Chen Yong-Zhong et Hou Mi. « Bunch length measurement using a traveling wave RF deflector ». Chinese Physics C 34, no 1 (janvier 2010) : 138–42. http://dx.doi.org/10.1088/1674-1137/34/1/026.

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Akira, Inoue, Natsui Takuya et Yoshida Mitsuhiro. « Cut disk structure type RF-deflector for slice emittance measurement for RF-gun at SuperKEKB ». Energy Procedia 131 (décembre 2017) : 334–41. http://dx.doi.org/10.1016/j.egypro.2017.09.431.

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Yamada, K., T. Motobayashi et I. Tanihata. « RF deflector system for proton-rich RI beams in RIKEN ». Nuclear Physics A 746 (décembre 2004) : 156–60. http://dx.doi.org/10.1016/j.nuclphysa.2004.09.064.

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Shor, A., D. Vartsky, V. Dangendorf, D. Bar, Y. Ben Aliz, D. Berkovits, M. Brandis et al. « Fast beam chopper at SARAF accelerator via RF deflector before RFQ ». Journal of Instrumentation 7, no 06 (7 juin 2012) : C06003. http://dx.doi.org/10.1088/1748-0221/7/06/c06003.

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Otani, M., K. Futatsukawa, Y. Liu, K. Hirano, A. Miura et T. Maruta. « Longitudinal Bunch Size Measurements with an RF Deflector at J-PARC LINAC ». Journal of Physics : Conference Series 1067 (septembre 2018) : 052008. http://dx.doi.org/10.1088/1742-6596/1067/5/052008.

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Pandey, H. K., T. K. Bhattacharya et A. Chakrabarti. « Development of deflector cavity and RF amplifier for bunch length detector system ». Journal of Instrumentation 11, no 02 (4 février 2016) : T02001. http://dx.doi.org/10.1088/1748-0221/11/02/t02001.

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Bai, Jin, Qushan Chen et Kuanjun Fan. « Design of a multipurpose RF deflector system applied in a compact linac ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 988 (février 2021) : 164893. http://dx.doi.org/10.1016/j.nima.2020.164893.

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Thèses sur le sujet "RF deflectors"

1

Dal, Forno Massimo. « Theoretical and experimental analysis of interactions between electromagnetic fields and relativistic electrons in vacuum chamber ». Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8570.

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2011/2012
Il laser ad elettroni liberi (FEL) è una sorgente luminosa di quarta generazione che ha specifiche più stringenti rispetto alle sorgenti luminose di terza generazione, tra le quali ricordiamo i sincrotroni. La cosiddetta emittanza e la traiettoria del fascio determinano la qualità del fascio, e devono soddisfare severi requisiti nei FEL. Per esempio, nella sala ondulatori, la posizione del fascio deve essere misurata con risoluzione micrometrica. Il controllo della posizione del fascio può essere effettuato utilizzando i “Cavity Beam Position Monitor” (Cavity BPM). Questa tesi descrive l’attività di ricerca eseguita sui Cavity BPM. Precisamente, la progettazione, la simulazione elettromagnetica e l'ottimizzazione di un Cavity BPM sono state effettuate. Successivamente, 25 Cavity BPM sono stati fabbricati e installati nella sala ondulatori del progetto FERMI@Elettra. I segnali sono stati acquisiti e processati con un nuovo tipo di elettronica, e una serie di misure sono state effettuate. Il secondo dispositivo studiato in questo dottorato è l'acceleratore lineare di particelle. Tradizionali strutture acceleranti, dotate di un accoppiatore a singolo ingresso causano la degradazione delle proprietà fascio elettronico, a causa dell’ asimmetria del campo elettromagnetico. Un nuovo tipo di accoppiatore, con cortocircuito mobile, viene proposto, nel quale il campo elettrico è stato simmetrizzato. La progettazione, simulazione elettromagnetica e ottimizzazione del dispositivo sono state effettuate, e un prototipo della struttura accelerante è stato prodotto e sintonizzato. Il campo elettrico è stato misurato con il metodo bead-pull. Infine, in questa tesi sono descritti i deflettori RF ad alta energia, che sono degli strumenti di diagnostica in grado di misurare le proprietà fascio elettronico, in particolare la lunghezza del banco di elettroni e lo spazio longitudinale di fase.
The Free Electron Laser (FEL) is a fourth generation light source that has more stringent specifications with respect to the third generation light sources, such as synchrotrons. The so-called emittance and the beam trajectory determine the beam quality, and must satisfy stringent requirements in FELs. For example, in the undulator hall, the beam position must be measured with the micrometer resolution. The control in the beam position can be achieved using a cavity beam position monitor (Cavity BPM). This thesis describes the research performed on the cavity BPM. Precisely, the electromagnetic design, the simulation and the optimization of a cavity BPM have been carried out. Subsequently, 25 cavity BPMs have been manufactured and installed in the undulator hall of the FERMI@Elettra project. A new RF front-end has been set up, and a series of measurements have been performed. The second device studied in this PhD is the travelling wave linear accelerator. Traditional accelerating structures endowed with a single feed coupler cause degradation of the electron beam properties, due to the electromagnetic field asymmetry. A new type of single feed structure with movable short circuit is proposed, where the electric field has been symmetryzed. The electromagnetic design, simulation and optimization of the device have been carried out, and a prototype of the accelerating structure has been produced and tuned. The electric field has been measured with the bead-pull method. Finally, in this thesis are described the High Energy RF Deflector (HERFD), which are a fundamental diagnostic tool to measure the electron beam properties, in particular the bunch length and the longitudinal phase space.
XXV Ciclo
1984
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2

Dal, Forno Massimo. « Theoretical and experimental analysis of interactions between electromagnetic fields and relativistic electrons in vacuum chamber ». Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8537.

Texte intégral
Résumé :
2011/2012
Il laser ad elettroni liberi (FEL) è una sorgente luminosa di quarta generazione che ha specifiche più stringenti rispetto alle sorgenti luminose di terza generazione, tra le quali ricordiamo i sincrotroni. La cosiddetta emittanza e la traiettoria del fascio determinano la qualità del fascio, e devono soddisfare severi requisiti nei FEL. Per esempio, nella sala ondulatori, la posizione del fascio deve essere misurata con risoluzione micrometrica. Il controllo della posizione del fascio può essere effettuato utilizzando i “Cavity Beam Position Monitor” (Cavity BPM). Questa tesi descrive l’attività di ricerca eseguita sui Cavity BPM. Precisamente, la progettazione, la simulazione elettromagnetica e l'ottimizzazione di un Cavity BPM sono state effettuate. Successivamente, 25 Cavity BPM sono stati fabbricati e installati nella sala ondulatori del progetto FERMI@Elettra. I segnali sono stati acquisiti e processati con un nuovo tipo di elettronica, e una serie di misure sono state effettuate. Il secondo dispositivo studiato in questo dottorato è l'acceleratore lineare di particelle. Tradizionali strutture acceleranti, dotate di un accoppiatore a singolo ingresso causano la degradazione delle proprietà fascio elettronico, a causa dell’ asimmetria del campo elettromagnetico. Un nuovo tipo di accoppiatore, con cortocircuito mobile, viene proposto, nel quale il campo elettrico è stato simmetrizzato. La progettazione, simulazione elettromagnetica e ottimizzazione del dispositivo sono state effettuate, e un prototipo della struttura accelerante è stato prodotto e sintonizzato. Il campo elettrico è stato misurato con il metodo bead-pull. Infine, in questa tesi sono descritti i deflettori RF ad alta energia, che sono degli strumenti di diagnostica in grado di misurare le proprietà fascio elettronico, in particolare la lunghezza del banco di elettroni e lo spazio longitudinale di fase.
The Free Electron Laser (FEL) is a fourth generation light source that has more stringent specifications with respect to the third generation light sources, such as synchrotrons. The so-called emittance and the beam trajectory determine the beam quality, and must satisfy stringent requirements in FELs. For example, in the undulator hall, the beam position must be measured with the micrometer resolution. The control in the beam position can be achieved using a cavity beam position monitor (Cavity BPM). This thesis describes the research performed on the cavity BPM. Precisely, the electromagnetic design, the simulation and the optimization of a cavity BPM have been carried out. Subsequently, 25 cavity BPMs have been manufactured and installed in the undulator hall of the FERMI@Elettra project. A new RF front-end has been set up, and a series of measurements have been performed. The second device studied in this PhD is the travelling wave linear accelerator. Traditional accelerating structures endowed with a single feed coupler cause degradation of the electron beam properties, due to the electromagnetic field asymmetry. A new type of single feed structure with movable short circuit is proposed, where the electric field has been symmetryzed. The electromagnetic design, simulation and optimization of the device have been carried out, and a prototype of the accelerating structure has been produced and tuned. The electric field has been measured with the bead-pull method. Finally, in this thesis are described the High Energy RF Deflector (HERFD), which are a fundamental diagnostic tool to measure the electron beam properties, in particular the bunch length and the longitudinal phase space.
XXV Ciclo
1984
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3

Khan, Sajjad. « Liquid Crystal Optics for Communications, Signal Processing and 3-D Microscopic Imaging ». Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3389.

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This dissertation proposes, studies and experimentally demonstrates novel liquid crystal (LC) optics to solve challenging problems in RF and photonic signal processing, freespace and fiber optic communications and microscopic imaging. These include free-space optical scanners for military and optical wireless applications, variable fiber-optic attenuators for optical communications, photonic control techniques for phased array antennas and radar, and 3-D microscopic imaging. At the heart of the applications demonstrated in this thesis are LC devices that are non-pixelated and can be controlled either electrically or optically. Instead of the typical pixel-by-pixel control as is custom in LC devices, the phase profile across the aperture of these novel LC devices is varied through the use of high impedance layers. Due to the presence of the high impedance layer, there forms a voltage gradient across the aperture of such a device which results in a phase gradient across the LC layer which in turn is accumulated by the optical beam traversing through this LC device. The geometry of the electrical contacts that are used to apply the external voltage will define the nature of the phase gradient present across the optical beam. In order to steer a laser beam in one angular dimension, straight line electrical contacts are used to form a one dimensional phase gradient while an annular electrical contact results in a circularly symmetric phase profile across the optical beam making it suitable for focusing the optical beam. The geometry of the electrical contacts alone is not sufficient to form the linear and the quadratic phase profiles that are required to either deflect or focus an optical beam. Clever use of the phase response of a typical nematic liquid crystal (NLC) is made such that the linear response region is used for the angular beam deflection while the high voltage quadratic response region is used for focusing the beam. Employing an NLC deflector, a device that uses the linear angular deflection, laser beam steering is demonstrated in two orthogonal dimensions whereas an NLC lens is used to address the third dimension to complete a three dimensional (3-D) scanner. Such an NLC deflector was then used in a variable optical attenuator (VOA), whereby a laser beam coupled between two identical single mode fibers (SMF) was mis-aligned away from the output fiber causing the intensity of the output coupled light to decrease as a function of the angular deflection. Since the angular deflection is electrically controlled, hence the VOA operation is fairly simple and repeatable. An extension of this VOA for wavelength tunable operation is also shown in this dissertation. A LC spatial light modulator (SLM) that uses a photo-sensitive high impedance electrode whose impedance can be varied by controlling the light intensity incident on it, is used in a control system for a phased array antenna. Phase is controlled on the Write side of the SLM by controlling the intensity of the Write laser beam which then is accessed by the Read beam from the opposite side of this reflective SLM. Thus the phase of the Read beam is varied by controlling the intensity of the Write beam. A variable fiber-optic delay line is demonstrated in the thesis which uses wavelength sensitive and wavelength insensitive optics to get both analog as well as digital delays. It uses a chirped fiber Bragg grating (FBG), and a 1xN optical switch to achieve multiple time delays. The switch can be implemented using the 3-D optical scanner mentioned earlier. A technique is presented for ultra-low loss laser communication that uses a combination of strong and weak thin lens optics. As opposed to conventional laser communication systems, the Gaussian laser beam is prevented from diverging at the receiving station by using a weak thin lens that places the transmitted beam waist mid-way between a symmetrical transmitter-receiver link design thus saving prime optical power. LC device technology forms an excellent basis to realize such a large aperture weak lens. Using a 1-D array of LC deflectors, a broadband optical add-drop filter (OADF) is proposed for dense wavelength division multiplexing (DWDM) applications. By binary control of the drive signal to the individual LC deflectors in the array, any optical channel can be selectively dropped and added. For demonstration purposes, microelectromechanical systems (MEMS) digital micromirrors have been used to implement the OADF. Several key systems issues such as insertion loss, polarization dependent loss, wavelength resolution and response time are analyzed in detail for comparison with the LC deflector approach. A no-moving-parts axial scanning confocal microscope (ASCM) system is designed and demonstrated using a combination of a large diameter LC lens and a classical microscope objective lens. By electrically controlling the 5 mm diameter LC lens, the 633 nm wavelength focal spot is moved continuously over a 48 [micro]m range with measured 3-dB axial resolution of 3.1 [micro]m using a 0.65 numerical aperture (NA) micro-objective lens. The ASCM is successfully used to image an Indium Phosphide twin square optical waveguide sample with a 10.2 [micro]m waveguide pitch and 2.3 [micro]m height and width. Using fine analog electrical control of the LC lens, a super-fine sub-wavelength axial resolution of 270 nm is demonstrated. The proposed ASCM can be useful in various precision three dimensional imaging and profiling applications.
Ph.D.
Optics and Photonics
Optics
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Actes de conférences sur le sujet "RF deflectors"

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Pérennou, André, Véronique Quintard et Joumane Aboujeib. « Analysis of the first order beam intensity variations in A-O deflectors during the RF transition time ». Dans International Congress on Ultrasonics. Vienna University of Technology, 2007. http://dx.doi.org/10.3728/icultrasonics.2007.vienna.1462_perennou.

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Heikkinen, J., J. Gustafsson, M. Kivikoski, E. Liukkonen et V. Nieminen. « RF deflector system for beamlines ». Dans The fifteenth international conference on the application of accelerators in research and industry. AIP, 1999. http://dx.doi.org/10.1063/1.59069.

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Ficcadenti, L., L. Palumbo, A. Mostacci, D. Alesini, C. Vaccarezza, G. Di Pirro et J. Rosenzweig. « RF measurements results of the final brazed SPARC RF deflector ». Dans 2007 IEEE Particle Accelerator Conference (PAC). IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4439948.

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Dolgashev, Valery A., et Juwen Wang. « RF design of X-band RF deflector for femtosecond diagnostics of LCLS electron beam ». Dans ADVANCED ACCELERATOR CONCEPTS : 15th Advanced Accelerator Concepts Workshop. AIP, 2013. http://dx.doi.org/10.1063/1.4773780.

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« Study on two-cell rf-deflector cavity for ultra-short electron bunch measurement ». Dans 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC). IEEE, 2013. http://dx.doi.org/10.1109/nssmic.2013.6829754.

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ALESINI, DAVID. « RF DEFLECTOR BASED SUB-PS BEAM DIAGNOSTICS : APPLICATION TO FEL AND ADVANCED ACCELERATORS ». Dans Proceedings of the 46th Workshop of the INFN ELOISATRON Project. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812772176_0001.

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Park, Sunjeong, Key Young Oang, Seong Hee Park, Hyun Woo Kim, Kyu-Ha Jang, Young Uk Jeong, In Hyung Beak et Eun-San Kim. « Ultrashort bunch duration measurement using S-band RF deflector in UED system at KAERI ». Dans 2019 International Vacuum Electronics Conference (IVEC). IEEE, 2019. http://dx.doi.org/10.1109/ivec.2019.8744870.

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Diab, Nadim A., et Issam A. Lakkis. « DSMC Simulations of Squeeze Film Under a Harmonically Oscillating Micro RF Switch With Large Tip Displacements ». Dans ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88422.

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The two-dimensional unsteady behavior of a rarefied gas film under an oscillating micro-cantilever RF switch is presented. The microbeam, undergoing a parabolic deflection profile, is allowed to oscillate harmonically between its equilibrium position and the fixed substrate underneath for large beam-tip displacements. The gas film dynamics in terms of the flow field velocity and fluid forces exerted on the oscillating microbeam are discussed. The numerical technique used to model the rarefied gas flow is the Direct Simulation Monte Carlo (DSMC) method where the Knudsen (Kn) number is greater than 0.01 (ie. non-continuum regime). Unlike previous work in literature, the beam undergoes large deflections, which requires implementation, in DSMC, of a more realistic molecule-beam reflection behavior based on the instantaneous beam’s position and velocity. The effects of inertia, both local acceleration (St) and convection term (Re), and compressibility (Ma) on the gas film dynamics are examined over ranges of oscillating frequencies, velocity amplitudes, and microbeam’s lengths.
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Riza, Nabeel A., et Demetri Psaltis. « Acoustooptic technique for beam scanning and beam formation In phased array radars ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.tht5.

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This paper introduces an optical technique for generation of phased array antenna drive signals for single and continuous mode beam scanning and beam formation. An optical system using two acoustooptic devices, imaging optics, and an array of high-speed detectors is used to generate the correctly phased signals. The required phase change on each detector is brought about by a frequency change in the acoustoptic device drive signal, which in turn maps frequency changes to changes in angular deflections. This results in a spatial frequency change on the detector plane. The detector array samples the generated phase distribution to produce the driving currents for the antenna elements. The Doppler shift in the acoustooptic interaction in the Bragg cells is used to produce the high-frequency carrier signal for the rf antennas. The use of optics eliminates expensive and bulky microwave frequency mixers. This processor can be operated up to a 10-GHz radar carrier frequency and provides system advantages such as single-parameter scan control, multiple-beam scanning, graceful degradation of antenna beam pattern with component failure, small-system losses, low-power requirements, and small size. The processor can be built in either bulk or integrated forms.
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Rapports d'organisations sur le sujet "RF deflectors"

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Stupakov, G. Correct Account of RF Deflections in Linac Acceleration(LCC-0018). Office of Scientific and Technical Information (OSTI), avril 2004. http://dx.doi.org/10.2172/826894.

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