NDLI: Quasi-optical system for converting gyrotron output into Gaussian beam

Content Provider	IEEE Xplore Digital Library
Author	Ogawa, I. Idehara, T. Itakura, Y. Ando, H. Wagner, D. Thumm, M.
Copyright Year	2004
Description	Author affiliation: Res. Center for Dev., Fukui Univ., Japan (Ogawa, I.; Idehara, T.; Itakura, Y.; Ando, H.)
Abstract	Summary form only given. High purity mode operation output ensures effective conversion of output radiation into the Gaussian beam. We have developed a new gyrotron, Gyrotron FU VA, which has a carefully designed resonant cavity in collaboration with the Max-Planck Institute for Plasma Physics and the Institute for High Power Pulse and Microwave Technology at the Research Center (FZK) Karlsruhe. In order to avoid conversion of the cavity mode to spurious modes, the cavity has an optimized design with nonlinear up-tapers and a rounded iris at the output. The resonance calculation using a scattering matrix formalism (SM-code) was performed taking into account the complete gyrotron geometry including the pumping sections (slots) and the window. The radiation patterns are measured by two-dimensionally (x-y plane) moving pyro-electric detector array over the gyrotron window. The measurement demonstrates that Gyrotron FU V can produce outputs of high purity mode for several operation modes. The patterns for these modes agree well with the intensity profiles calculated. This demonstrates that Gyrotron FU VA can produce outputs of high purity mode. Such a feature is favorable for converting a gyrotron output into a Gaussian beam. We have constructed a quasi-optical system intended to convert the radiation of the Gyrotron FU VA into bi-Gaussian beams. The system consists of two components, namely a quasi-optical antenna and an ellipsoidal mirror. The former converts the gyrotron radiation of TE/sub 0n/ and TE/sub 1n/ operating modes into linearly-polarized beams and the latter produces the required far-field pattern. The measurements of the final beam structure have demonstrated that the system developed produces bi-Gaussian beams from the outputs of TE/sub 03/ and TE/sub 13/ operating modes.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	74978
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1340114
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gyrotrons Tellurium Resonance Microwave technology Collaboration Plasmas Physics Design optimization Iris Scattering
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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