NDLI: Two-gigawatt burst-mode operation of the intense microwave prototype (IMP) free-electron laser (FEL) for the microwave tokamak experiment (MTX)

Content Provider	IEEE Xplore Digital Library
Author	Felker, B. Allen, S. Bell, H. Bowman, J. Delong, M. Fenstermacher, M. Ferguson, S.W. Fields IV, W.F. Hathaway, D. Hooper, E.B. Hulsey, S. Jackson, M. Lang, D.D. Lasnier, C. Makowski, M. Moller, J. Meyer, W. Nilson, D.G. Peterson, D. Seilhymer, D.B. Stallard, B.
Copyright Year	1993
Description	Author affiliation: Lawrence Livermore Nat. Lab., CA, USA (Felker, B.; Allen, S.; Bell, H.; Bowman, J.; Delong, M.; Fenstermacher, M.; Ferguson, S.W.; Fields, W.F., IV; Hathaway, D.; Hooper, E.B.; Hulsey, S.; Jackson, M.; Lang, D.D.; Lasnier, C.; Makowski, M.; Moller, J.; Meyer, W.; Nilson, D.G.; Peterson, D.; Seilhymer, D.B.; Stallard, B.)
Abstract	The MTX explored the plasma heating effects of 140 GHz microwaves from both Gyrotrons and from the IMP FEL wiggler. The Gyrotron was long pulse length (0.5 seconds maximum) and the FEL produced short-pulse length, high-peak power, single and burst modes of 140 GHz microwaves. Full-power operations of the IMP FEL wiggler were commenced in April of 1992 and continued into October of 1992. The Experimental Test Accelerator II (ETA-II) provided a 50-nanosecond, 6-MeV, 2-3 kAmp electron beam that was introduced co-linear into the IMP FEL with a 140 GHz Gyrotron master oscillator (MO). The FEL was able to amplify the MO signal from approximately 7 kW to peaks consistently in the range of 1-2 GW. This microwave pulse was transmitted into the MTX and allowed the exploration of the linear and non-linear effects of short pulse, intense power in the MTX plasma. Single pulses were used to explore and gain operating experience in the parameter space of the IMP FEL, and finally evaluate transmission and absorption in the MTX. Single-pulse operations were repeatable. After the MTX was shut down burst-mode operations were successful at 2 kHz. This paper will describe the IMP FEL, Microwave Transmission System to MTX, the diagnostics used for measurements, and tile operations of the entire Microwave system. A discussion of correlated and uncorrelated errors that affect FEL performance will be made. Linear and nonlinear absorption data of the microwaves in the MTX plasma will be presented.
Starting Page	589
Ending Page	592
File Size	459795
Page Count	4
File Format	PDF
ISBN	0780314123
DOI	10.1109/FUSION.1993.518543
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electromagnetic heating Gyrotrons Pulse amplifiers Undulators Electromagnetic wave absorption Plasma measurements Testing Life estimation Electron accelerators Electron beams
Content Type	Text
Resource Type	Article

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Two-gigawatt burst-mode operation of the intense microwave prototype (IMP) free-electron laser (FEL) for the microwave tokamak experiment (MTX)

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