NDLI: Experimental Investigation of a Novel Circuit for MM-Wave TWTs

Content Provider	IEEE Xplore Digital Library
Author	Theiss, A.J. Meadows, C.J. True, R.B.
Copyright Year	2006
Description	Author affiliation: L-3 Commun. Electron Devices, San Carlos, CA (Theiss, A.J.; Meadows, C.J.; True, R.B.)
Abstract	A single-circuit-section-type W-band FWTWT that utilizes a novel PPM circuit has been built and tested. The novel circuit features voids at the centers of the pole pieces. These voids, which comprise part of the slow wave circuit, occur both at the magnetic field cusps of the large pole pieces and at the magnetic field minima of the small pole pieces. The circuit utilizes thick pole pieces that bring magnetic flux directly to the beam tunnel to support 4-kilowatt beams with lambda $_{p}/L$ values around 10. For this TWT, a tetrode gun creates ultra-laminar electron beams typically around 0.24 amperes at 18 kV. (See "Experimental Investigation of a Tetrode Gun for MM-Wave TWTs," by A.J.Theiss, R.B.True, and C.J.Meadows, 4th IEEE International Vacuum Electronics Conference, Seoul, Korea, May 28-30, 2003.) When compared to an equivalent beam-stick-type circuit that does not have such voids, transmission for such beams degrades from 99.5% percent down to a maximum of 98%. However this circuit focuses beams as high as 9.25 kW (25 kV, 0.37A) at a 97% transmission level. Outer and inner grid drive levels for 97% transmission of various 0.1-microperveance beams are shown. Output power measurements were made on this W-band FWTWT, which operates around 91 gigahertz on the edge of the passband. Typical small-signal gain data are shown for 21 kV, 0.301 A beams. Observed small-signal gain ripple resulted from coupler matches that degraded both from inductive-post welding and from unexpected alloy flow. Results from MAGIC3D simulations that utilize three-dimensional PPM fields imported from MAXWELL models generally agree with test data. External output-input RF feedback through a frequency filter that eliminates second-passband BWOs provided 10 watts of stable output and 40 watts of regenerative output on again spike
Starting Page	183
Ending Page	184
File Size	469895
Page Count	2
File Format	PDF
ISBN	1424401089
DOI	10.1109/IVELEC.2006.1666245
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-04-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuit testing Magnetic circuits Magnetic fields Degradation Magnetic flux Electron beams Power generation Power measurement Passband Couplings
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

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