NDLI: Beam transport modeling of PPM focused THz sheet beam TWT circuit

Content Provider	IEEE Xplore Digital Library
Author	Baig, A. Jian-Xun Wang Barnett, L.R. Luhmann, N. Young-Min Shin
Copyright Year	2011
Description	Author affiliation: Department of Engineering, Applied Science, University of California, Davis, Davis, CA 95616, USA (Baig, A.; Jian-Xun Wang; Barnett, L.R.; Luhmann, N.; Young-Min Shin)
Abstract	We report periodic permanent magnet modeling for an efficiently focused sheet beam (∼7:1) transport achieved in a relatively long (40 mm) drift tube. To perform a quick pulsed device (TWT) test, it is planned for a high aspect ratio electron gun (12:1, designed by $CPI^{1}$ for solenoidal field focused beam) to be used for currently designed PPM focused ∼7:1 aspect ratio sheet beam, with drift tube to act as an aperture to the incoming planar stream of electrons. Extensive simulations have been conducted to elucidate beam trajectory analysis and parasitic beam interception with drift tube walls. Two different permanent magnet materials were considered (a) SmCo (Br =1.15T) and(b) NdFeB (Br =1.4T). For Case (a), we obtained beam transmission of 80% with spacing between parallel magnet stacks of 2.6 mm and for case (b) we obtained beam transmission of ∼73.35% that includes tuning voltage on Focus Electrode, for an increased stack spacing of 4 mm that is crucial, in order to provide sufficient space for the slow wave structure/couplers fabrication. This corresponds to 190 mA transmitted current. Particle in Cell (PIC) simulations were also conducted to analyze beam-wave interaction at a significantly lower current ∼ 90 mA (approx 50% of what anticipated) to analyze a worst case scenario. The currently designed actual PPM B-Field was employed. The PIC simulation result was very promising, showing ∼ 10 dB gain and maximum output of 16 W for an input drive of 1 W at 0.22THz. For 190 mA transmitted current, the anticipated maximum output power is 75 W with a gain of 17 dB.
Starting Page	351
Ending Page	352
File Size	133370
Page Count	2
File Format	PDF
ISBN	9781424486625
e-ISBN	9781424486618
DOI	10.1109/IVEC.2011.5747020
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-02-21
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electron tubes Electron beams Gain Magnetostatics Magnetostatic waves Permanent magnets SmCo/NdFeB Sheet Beam PPM Focusing Beam Transport
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in