Efficiency results from a coaxial vircator using a simple feedback technique
Mankowski, J.
Cheng, X.
Dickens, J.
Kritiansen, M.
Choi, E.
Dept. of Electr. & Comput. Eng. & Phys., Texas Tech. Univ., Lubbock, TX, USA
This paper appears in: Pulsed Power Conference, 2003. Digest of Technical Papers. PPC-2003. 14th IEEE International Publication Date: 15-18 June 2003
Volume: 1
On page(s):
455
- 458 Vol.1
ISSN:
ISBN: 0-7803-7915-2
Digital Object Identifier: 10.1109/PPC.2003.1277749
Current Version Published: 2004-03-30
Abstract
Experimental findings on the coaxial virtual cathode oscillator (vircator) at Texas Tech University are reported. A major modification to the system extended the pulse forming line several meters. The pulsed power system now delivers up to 750 kV and 60 kA for at least 70 nsec. Additional modifications include diagnostics to measure the diode voltage, current, and radiated field pattern of the output microwaves. In this initial phase of experiments copper reflectors were installed within the diode to provide a simple means of microwave feedback to assist in the e-beam modulation. Thus far we have observed microwave peak power output with feedback reflectors as high as 3.5 GW corresponding to an efficiency of ∼9.5%. Measured radiated field patterns show evidence of multimode operation.
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