NDLI: Rep-rate modulator and electron gun for high power microwave research using ferroelectric cathodes

Content Provider	IEEE Xplore Digital Library
Author	Ivers, J.D. Flechtner, D. Golkowski, C. Ivers, J.D. Kerslick, G.S. Nation, J.A.
Copyright Year	1997
Description	Author affiliation: Cornell Univ., Ithaca, NY, USA (Ivers, J.D.)
Abstract	Summary form only given, as follows. A novel pulse modulator, previously described at the 1995 PAC meeting, has been reconfigured to give a better pulse shape at a slightly lower beam energy and with a higher current (500 kV, 1000 A). The device has been run at rated voltage and current for pulse durations in excess of 200 ns and at a low /spl sim/0.1 Hz power supply limited repetition rate. The modulator, which is designed for use in our high power microwave research program, has been coupled to an electron gun which uses a ferroelectric cathode. We report in this paper on the revised design and performance of the modulator and present data on the electron gun design and characteristics. The recessed ferroelectric cathode is located in the fringing field of a 3 kG solenoidal magnetic field so that the 500 A emitted current is compressed to about a 1 cm diameter pencil beam. The cathode emission is initiated by a 100 ns 2 kV pulse inductively decoupled from the ground by a coaxial cable wound around the transformer core. The pulse transformer, which is driven by three pairs of 10 /spl Omega/ pulse transformer, which is lines in parallel, feeds a fourteen to one step up transformer giving a source impedance of 500/spl omega/. It is switched independently of the ferroelectric trigger to provide maximum flexibility in the design. Results will be reported on all aspects of the system design and operation.
File Size	86747
File Format	PDF
ISBN	0780339908
ISSN	07309244
DOI	10.1109/PLASMA.1997.604393
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrons Pulse modulation Pulse transformers Pulse shaping methods Pulsed power supplies Ferroelectric materials Cathodes Microwave devices Optical modulation Shape
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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