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[en] High frequency gyrotrons suitable for ECRH are presently being investigated at MIT. The goal has been to increase efficiency to levels predicted by theory. Results from megawatt gyrotron experiments operating between 110 and 140 GHz will be presented. The beam velocity spread has been measured using a retarding potential diagnostic. The measured perpendicular velocity spread was typically between ±10% and ±15% for velocity ratios between 1.5 and 2.0. The spread was larger at higher beam currents. Good agreement was also obtained between two separate measurements of the velocity ratio. A new experiment at 110 GHz is now being assembled. This device will operate in the TE22,6,1 mode and will have an internal converter to produce a Gaussian output beam
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Birch, J.R.; Parker, T.J. (eds.); 714 p; ISBN 0-8194-1392-5; 
; 1993; p. 515-516; SPIE--The International Society for Optical Engineering; Bellingham, WA (United States); 18. annual international conference on infrared and millimeter waves; Colchester (United Kingdom); 6-10 Sep 1993; SPIE--The International Society for Optical Engineering, P.O. Box 10, Bellingham, WA 98227-1101 (United States)
; 1993; p. 515-516; SPIE--The International Society for Optical Engineering; Bellingham, WA (United States); 18. annual international conference on infrared and millimeter waves; Colchester (United Kingdom); 6-10 Sep 1993; SPIE--The International Society for Optical Engineering, P.O. Box 10, Bellingham, WA 98227-1101 (United States)