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Academic literature on the topic 'RF mirror'

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Published: 6 September 2023

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Journal articles on the topic "RF mirror"

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Danisi, A., G. Vayakis, and M. Walsh. "Guidelines for optimal design of radio-frequency in-vacuum coaxial transmission line for mirror cleaning service in ITER diagnostics." Journal of Instrumentation 17, no. 02 (February 1, 2022): C02019. http://dx.doi.org/10.1088/1748-0221/17/02/c02019.

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Abstract Several optical diagnostics in the ITER fusion reactor make use of big mirrors which are placed within the ITER vacuum vessel (VV), and therefore cannot have high accessibility. Plasma deposits developing on these mirrors may hinder the reflectivity of the mirror themselves, requiring a remote cleaning operation. The radio-frequency (RF) discharge mirror cleaning service operates a plasma discharge in the vicinity of the mirror, eroding the deposit layer and therefore cleaning the mirror remotely. In order to achieve this, RF power needs to be sent from outside the VV to the mirror, using a transmission line. Very stringent design requirements are applicable to the design of this RF line, such as vacuum compatibility, high power handling, low losses, overall matching, no cable over-heating, etc. This paper analytically addresses the design optimization of the RF mirror cleaning transmission line, taking into account ITER requirements, in order to give robust guidelines for the possible ad-hoc cable design adaptation that is to be undertaken case-by-case. The design guidelines are based on underlying transmission line theory, from which a set of design equations are drawn. The optimal design is achieved using design optimization considerations in the available design space. These guidelines are considered to be a useful design tool for optical diagnostics requiring mirror cleaning operation, and are aimed at harmonising the transmission line design procedures across the different cases.
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Kotelnikov, I. A., and S. G. Kuzmin. "RF plugging of mirror plasma." Journal of Fusion Energy 15, no. 3-4 (December 1996): 173–81. http://dx.doi.org/10.1007/bf02266932.

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Yadav, Praveen Kumar, Mukund Kumar, Raj Kumar Gupta, Mangalika Sinha, J. A. Chakera, and M. H. Modi. "Refurbishment of an Au-coated toroidal mirror by capacitively coupled RF plasma discharge." Journal of Synchrotron Radiation 26, no. 4 (May 17, 2019): 1152–60. http://dx.doi.org/10.1107/s1600577519003485.

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Deposition of synchrotron-radiation-induced carbon contamination on beamline optics causes their performance to deteriorate, especially near the carbon K edge. The photon flux losses due to carbon contamination have spurred researchers to search for a suitable decontamination technique to restore the optical surface and retain its performance. Several in situ and ex situ refurbishing strategies for beamline optics are still under development to solve this serious issue. In this work, the carbon contamination is removed from a large (340 mm × 60 mm) Au-coated toroidal mirror surface using a capacitively coupled low-pressure RF plasma. Before and after RF plasma cleaning, the mirror was characterized by Raman spectroscopy, soft X-ray reflectivity (SXR) and atomic force microscopy (AFM) techniques. The Raman spectra of the contaminated mirror clearly show the G (1575–1590 cm−1) and D (1362–1380 cm−1) bands of graphitic carbon. The SXR curve of the contaminated mirror shows a clear dip near the critical momentum transfer of carbon, indicating the presence of carbon contamination on the mirror surface. This dip disappears after removal of the contamination layer by RF plasma exposure. A decrease in the intensities of the CO bands is also observed by optical emission spectrometry during plasma exposure. The AFM and SXR results suggest that the root-mean-square (r.m.s.) roughness of the mirror surface does not increase after plasma exposure.
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Tominaga, Yusuke, Atsushi Mikami, Akiya Iwamura, Koji Usami, and Kazuyuki Takeda. "Heating-free, room-temperature operation of a radiofrequency-to-light signal transducer with a membrane oscillator and a built-in metasurface mirror." Applied Physics Express 15, no. 1 (December 9, 2021): 012003. http://dx.doi.org/10.35848/1882-0786/ac3e15.

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Abstract We present an electro-mechano-optical radiofrequency (rf)-to-light signal transducer robust against laser heating and thus operational at room temperature. A metal-free, low-loss metasurface mirror and an aluminum electrode made separately on a Si3N4 membrane oscillator comprise a chain of electro-mechanical and opto-mechanical systems, mediating electrical and optical signals through the (2,2)-mode characteristic oscillation. We demonstrate up-conversion of rf signals at 175.2 MHz by 6 orders of magnitude in frequency to an optical regime with the transfer efficiency of 2.3 × 10−9, also showing stable operation due to reduced laser heating of the mirror.
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Shigin, Pavel, Nikita Babinov, Gregory De Temmerman, Alessandro Danisi, Artem Dmitriev, Jens Larsen, Rene Madsen, et al. "RF discharge mirror cleaning system development for ITER diagnostics." Fusion Engineering and Design 164 (March 2021): 112162. http://dx.doi.org/10.1016/j.fusengdes.2020.112162.

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Tang, Yunying, Fukun Liu, Xiaojie Wang, Wei Wei, Liyuan Zhang, Handong Xu, Dajun Wu, Weiye Xu, and Jian Wang. "Conceptual design of CFETR ECRH equatorial launcher and upper launcher." EPJ Web of Conferences 203 (2019): 04016. http://dx.doi.org/10.1051/epjconf/201920304016.

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The Electron Cyclotron Resonance Heating (ECRH) system of China Fusion Engineering Test Reactor (CFETR) is designed to inject 20 MW RF power into the plasma for heating and current drive (H&CD) applications. The ECRH system consists of 20 gyrotrons, the associated power supplies, the transmission lines and one launcher. In order to compare the launcher performance from equatorial and upper ports, two types of launcher are designed in this paper. In equatorial launcher (EL), twenty in-vessel transmission lines are divided into four groups. Every five gaussian beams from in-vessel transmission lines face one fixed focusing mirror and one steering mirror. All gaussian beams are injected into the plasma with optimal toroidal and poloidal angles calculated by C3PO/LUKE code. In upper launcher (UL), twenty-one transmission lines are supposed and divides into three groups. Every seven gaussian beams are injected into one fixed focusing mirrors and all twenty-one beams reflected to one common steering mirror finally. The optical transmission characteristics and the convergence information of gaussian beams are checked and optimized. The EL or UL is installed on the equatorial or upper port with a port-plug modular structure.
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Ueda, Kyosuke, Takayuki Narushima, Tomoyuki Katsube, Hiroshi Kawamura, and Takashi Goto. "In Vitro Evaluation of RF Magnetron-Sputtered Calcium Phosphate Films on Titanium." Key Engineering Materials 352 (August 2007): 305–9. http://dx.doi.org/10.4028/www.scientific.net/kem.352.305.

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Calcium phosphate coating films were fabricated on mirror-polished or blast-treated titanium substrates using radio-frequency (RF) magnetron sputtering and they were evaluated in vitro. Immersion tests for the films were conducted using phosphate-buffered saline (PBS(-)), and apatite formation and the elution of calcium ions from the films were investigated. The bonding strengths between the calcium phosphate films and titanium substrates before and after the immersion tests were evaluated. After the immersion tests, a decrease in the bonding strength was observed for the coating films on the mirror-polished titanium substrates, while that for the blast-treated titanium substrates was almost the same as that before the immersion tests.
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Chandrasenan, Archa, and Joseph Zacharias. "Non-linear photonic loop mirror based co-site interference canceller." Laser Physics Letters 19, no. 11 (October 13, 2022): 116207. http://dx.doi.org/10.1088/1612-202x/ac9679.

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Abstract Full duplex-in band (FDIB) is a well-established solution for increasing the data rate and spreading the link range for future communication systems. FDIB systems need no additional bandwidth requirement. However, they are confronted with a major interference challenge on the same site, called co-site interference (CSI). Long-established co-site interference cancellation (CSIC) methods achieve a cancellation depth upto 35 dB, conversely it has space containments, manufacturing imperfections, induces noise penalties and limits isolation bandwidth. To overcome these problems, RF photonic CSIC methods have been developed, which have produced 30 dB wide-band interference suppression. They also increase bandwidth, have a flexible structure, minimize losses and prevent periodic power fading. But these systems have a problem of inherent DC drift, low maintenance of coherence, and low isolation at low transmission power. Thus, there is a high need for photonic CSIC designs of FDIB systems that operate over wider bandwidths and at higher transmission powers. Here, a newfangled CSIC system based on a non-linear photonic loop and frequency down-conversion is proposed. It shows excellent CSIC suppression of greater than 61 dB, for a single frequency signal of interest (SOI) with maximum RF power of 13 dBm. Without frequency down-conversion, the system maintains an average cancellation depth of 62.541 dB for single frequency SOI. After frequency down conversion, the system maintains an average cancellation depth of 61.208 dB for narrow band SOI. The system attains 18% error vector magnitude at −20 dB RF output power, which confirms the comprehensive quality of the system.
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Kwon, M., J. G. Bak, K. K. Choh, J. H. Choi, J. J. Choi, J. W. Choi, K. S. Chung, et al. "RF-heating and plasma confinement studies in the HANBIT mirror device." Nuclear Fusion 43, no. 8 (July 18, 2003): 686–91. http://dx.doi.org/10.1088/0029-5515/43/8/308.

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Jhang, Hogun, S. S. Kim, S. G. Lee, J. G. Bak, and B. H. Park. "Influence of rf waves on interchange modes in HANBIT mirror plasmas." Nuclear Fusion 45, no. 9 (August 25, 2005): 1109–19. http://dx.doi.org/10.1088/0029-5515/45/9/011.

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Dissertations / Theses on the topic "RF mirror"

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Issiaka, Koné. "Résonateurs à Ondes Acoustiques Guidées sur Miroir de Bragg." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2010. http://tel.archives-ouvertes.fr/tel-00540624.

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Les composants passifs électro-acoustiques sont des éléments critiques des architectures RF. Les plus représentés sont les filtres à ondes acoustiques de surface (SAW) ou de volume (BAW), qui permettent le filtrage RF (filtre d'antenne). Pour le filtrage de canal, les solutions SAW sont actuellement en place, bien que des travaux récents aient montré l'intérêt des résonateurs à ondes de Lamb pour ce type d'application. Ces derniers composants présentent l'avantage d'être compatibles avec une technologie de fabrication de filtres BAW réalisés sur membrane suspendue (FBAR), permettant une co-intégration des deux types de composants à moindre coût. Toutefois, le choix technologique de STMicroelectronics et du CEA-Leti s'est porté sur une technologie de résonateurs BAW réalisés sur miroir de Bragg (SMR). Le but de cette thèse est donc de démontrer la possibilité de réaliser des résonateurs reprenant le principe des résonateurs à ondes de Lamb, mais co-intégrables avec des BAW-SMR. Après une présentation de l'état des lieux des composants électromécaniques utilisés dans les architectures RF et des diverses propositions de dispositifs semblables présentes dans la littérature, nous abordons une étude théorique du principe de fonctionnement de ce type de composants, ce qui nous permet d'en cerner les caractéristiques : coefficients de couplage électromécaniques proches de ceux des résonateurs à ondes de Lamb, mais fonctionnement à des fréquences proches de celles des résonateurs BAW. Nous présentons ensuite les méthodes de dimensionnement employées. Enfin, nous présentons un procédé de réalisation proche de celui des BAWSMR fabriqués au CEA-Leti, mais adapté à nos composants. A l'issue de caractérisations électriques, nous sommes en mesure de présenter les premiers composants de ce type fonctionnels, et une liste d'améliorations possibles. Ces travaux ont permis des publications dans quatre conférences dont trois internationales, un journal, un dépôt de brevet d'invention et deux publications internes au laboratoire commun IEMNSTMicroelectronics. Mots clés : Résonateur, Filtre, BAW, SAW, Ondes de Lamb, Ondes guidées, MEMS, Architecture RF, Télécommunication mobile, Acoustique, Miroir de Bragg, Modélisation FEM, Matrice de réflexion. Glossaire : SAW : Surface Acoustic Wave Resonator/Résonateur à ondes acoustiques des surface, BAW : Bulk Acoustic Wave/Ondes de volume, FBAR : Film Bulk Acoustic Resonator/Résonateur à ondes de volume sur une membrane, SMR : Solidily Mounted Resonator/Résonateur à ondes de volume sur un miroir de Bragg.
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XIE, JING-HAN, and 謝京翰. "RF magnetron sputter deposition of WO3/Ag/W/WO3 multilayer for electrochromic transparent heat mirror." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fnn4t3.

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碩士
明新科技大學
光電系統工程系碩士班
108
In this study, in order to prevent the silver film from being oxidized, a layer of tungsten（W）was deposited on the silver（Ag）film to form the WO3/Ag/W/WO3（WAWW）conductive multilayer films, which were deposited on the B270 glass substrate with W and Ag targets by using radio frequency magnetron reactive sputtering system at room temperature. The WAWW multilayer films were electrically conductive when the thickness of the W layer must be greater than 2 nm. The sheet resistance of the WAWW films was 4.6 /sq when the thickness of the W layer was 2 nm. Based on the structure of the WAWW multilayer films, the WAWW 7-layer coating was designed by the Essential Macleod optical film software and was fabricated to investigate its optical properties and electrochromism. The design of electrochromic WAWW 7-layer coating was WO3（29.46 nm）/Ag（14.2 nm）/W（2 nm）/WO3（68.58 nm）/Ag（16.97 nm）/W（2 nm）/WO3（30.4 nm）. The average transmittance of the WAWW 7-layer coating in the visible light range and the infrared range in the bleached state was 71.5% and 9.9%, respectively. The average transmittance of the WAWW 7-layer coating in the visible light range in the colored state was 23.6%. The WAWW 7-layer coating has electrochromic properties and electrical conductivity and can be used as a transparent heat mirror.
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Goulding, Richard Howell. "RF startup in the Phaedrus and Phaedrus-B tandem mirrors." 1987. http://catalog.hathitrust.org/api/volumes/oclc/17020573.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1987.
Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 241).
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Books on the topic "RF mirror"

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Centre, Bhabha Atomic Research, ed. Development of a state-of-the-art R.F. sputtering coating system for the fabrication of multilayer x-ray mirrors. Mumbai: Bhabha Atomic Research Centre, 2000.

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Wu, Zhizheng. Modeling and Control of Magnetic Fluid Deformable Mirrors for Adaptive Optics Systems. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Iqbal, Azhar, Zhizheng Wu, and Foued Ben Amara. Modeling and Control of Magnetic Fluid Deformable Mirrors for Adaptive Optics Systems. Springer, 2014.

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Conference papers on the topic "RF mirror"

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Wasilewski, B., H. J. Baker, and D. R. Hall. "RF-Excited Slab Waveguide CO2 Lasers Utilising Graded Phase Mirror Resonators." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwn2.

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RF discharge excited slab-waveguide carbon dioxide lasers have been developed as relatively inexpensive sources of good beam quality, high power, far infrared radiation (10.6µm). They commonly incorporate a hybrid resonator design which involves waveguide propagation in the transverse direction and a confocal-unstable design in the lateral (wide) dimension. Such resonators offer excellent beam quality, adequate for most applications. However, they may exhibit variations in the beam shape when mirrors are tilted, and scaling the laser to high powers requires use of wide spherical mirrors, which causes increased sensitivity to unwanted spherical curvatures (bending and twisting) overlaid on the mirror shape during manufacturing and/or mounting, To remove this unwanted behaviour, alternative resonator geometries are under consideration.
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YANG, T., X. YAO, S. PENG, W. KRUEGER, and F. CHANG-DIAZ. "An RF heated tandem mirror plasma propulsion study." In 25th Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-2383.

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Adams, Michael, Sian Byron, Adam Chace, James Schemmer, and Peter Vitruk. "Mode Quality Control in Large Area, RF Excited CO2 Laser Employing Split-Wave Hybrid Resonator." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthh6.

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Gas discharge excitation at 40.68 MHz (ISM frequency in the VHF-band) is proven to be efficient for non-wave-guide, diffusion-cooled, large area CO2 laser employing a novel type of resonator cavity referred to as split-wave hybrid (SWH) resonator [1]. SWH resonator approach represents a custom resonator concept in the design of sealed-off, high power, single mode CO2 lasers for industrial applications. Electrode walls in the SWH resonator act as wave-front-splitting mirrors similar to a Fresnel double mirror or Lloyd mirror interferometer [2].
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Watkins, G. T., and K. Mimis. "Dynamic Load Modulation RF Amplifier with Current Mirror Based Varactor Driver Amplifier." In Active and Passive RF Devices Seminar. Institution of Engineering and Technology, 2016. http://dx.doi.org/10.1049/ic.2016.0007.

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Zmuda, H., and E. N. Toughlian. "Deformable mirror-based optical beam-forming systems for phased-array radar." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fee3.

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Two types of photonic processors for generating the properly phased signals for a dynamically steered phased-array antenna are presented. Both methods make use of a class of spatial light modulator known as a deformable-mirror device (DMD). These devices can be envisioned as an N × N array of mirror elements, each capable of (computer-controlled) independent motion that is typically on the order of optical wavelengths. Varying this optical path length produces a substantial rf phase shift through photomixing. Because the number of elements in a DMD can be large (each DMD element corresponds to an array element, the highly directive antenna radiation patterns necessary for radar applications can be readily achieved. It is further demonstrated that a DMD-based system can be used to synthesize a variable rf delay line. Continuously variable true time delay in the rf regime has never been previously obtained, and, as such the scheme presented represents a significant contribution to the rf/microwave community as a whole. Experimental results that demonstrate both systems' performance are presented.
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Xin, Jianguo, Wentao Jiao, and Yanlin Sheng. "RF Excited Diffusively Cooled Kilowatts Carbon monoxide slab waveguide Laser." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthj4.

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In the past few years, an area scaling technique with the advantages of simplicity and easy achieving compact high power lasers have been well developed and applied in the field of RF excited waveguide carbon dioxide and Xe and Ar lasers, which employs an RF gas discharge excited slab hollow waveguide and an unstable optical resonator combined with a diffusive cooling technique to obtain a compact high power laser. In this paper, we shall present an RF gas discharge excited carbon monoxide area scaling laser. In this laser, the top electrode was cooled with the tap water and the bottom electrode was cooled with the liquid nitrogen to maintain the slab waveguide gas discharge region at a very low temperature The discharge region has a size of 500mm length × 178mm width × 2mm height. In the experiments, a slab waveguide region was excited by a RF transverse gas discharge at a frequency of 93MHz, a new type of optical resonator consisting of a concave mirror with a curvature radius of 5390mm, a convex mirror with a curvature radius of 4330mm and a flat feedback mirror was employed, the output aperture size is 2mm × 45mm, a gas composition of CO : He : Xe : O2 at a ratio of 8.7 : 87 : 3.9 : 0.4 with operation pressures between 50 torr and 70 torr was used, by which a maximum of laser power output of over 1 Kilowatts was obtained.
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Moiseenko, V. E., N. B. Dreval, O. Ågren, K. N. Stepanov, A. V. Burdakov, P. V. Kalinin, V. I. Tereshin, Philip M. Ryan, and David Rasmussen. "Strong RF Heating in a Mirror During Plasma Build-up." In RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas. AIP, 2007. http://dx.doi.org/10.1063/1.2800544.

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Park, B. H. "Hybrid Method for RF Heating Problem of Mirror Confinement Machine." In RADIO FREQUENCY POWER IN PLASMAS: 15th Topical Conference on Radio Frequency Power in Plasmas. AIP, 2003. http://dx.doi.org/10.1063/1.1638085.

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Grant, William B. "An Intermediate-distance Dual cw CO2 Laser Remote Sensor for Atmospheric Trace Gases." In Optical Remote Sensing. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ors.1985.tuc30.

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A dual cw CO2 laser system has been designed and is being assembled for remote long-path measurement of atmospheric trace gases. The components comprise a pair of RF-excited, grating-tunable waveguide CO2 lasers, a beam splitter, a 5X beam expanding telescope with a pinhole aperture, transmit mirrors, a 37-cm diameter collector mirror, a HgCdTe detector, a pyroelectric reference detector, a dual function generator, four phase-sensitive (lock-in) detectors, three ratiometers, a differential meter and a chart recorder.
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Hwang, Ruey-Bing. "A cylindrical metamaterial mirror (Invited Paper)." In 2015 IEEE MTT-S 2015 International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO). IEEE, 2015. http://dx.doi.org/10.1109/imws-bio.2015.7303802.

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