Cyclotron autoresonance maser amplifier experiments at MIT

Author

Bekefi ; Danly, B.G. ; Davies ; DiRienzo ; Leibovitch ; Pendergast ; Temkin, Richard J. ; Wurtele, J.S.

Author_Institution

MIT, Cambridge, MA, USA

fYear

1989

fDate

0-0 1989

Firstpage

110

Abstract

Summary Form only given, as follows. Two studies of cyclotron autoresonance maser (CARM) amplifiers are underway at MIT. They differ both in frequency and in the technologies used. The 35-GHz amplifier uses a 1.5 MeV, 260 A, 30 s electron beam from a field-emission (explosive) cathode energized by a Marx-type accelerator. The entire system is immersed in a uniform, pulsed magnetic field of 7 kG. Measurements give a small-signal gain of 90 dB/m, a saturated power output of 10 MW, and an electronic efficiency of 3%. The 140 GHz amplifier under development will use a 450-700 kV, 30 A, 1 mu s electron beam from a Pierce-type gun driven by a high-voltage, long-pulse modulator. The magnetic field ( approximately 25 kG) in the CARM interaction region will be produced by a superconducting magnet. Theoretical investigations of CARM efficiency, efficiency enhancement by magnetic tapering, and amplifier stability are also being carried out.<>

Keywords

gyrotrons; magnetic fields; masers; 1.5 MeV; 140 GHz; 25 kG; 260 A; 30 A; 35 GHz; 450 to 700 kV; 7 kG; Pierce electron gun; amplifier stability; cyclotron autoresonance maser amplifier; efficiency; electron beam; electronic efficiency; field emission cathode; interaction region; magnetic field; magnetic tapering; saturated power output; small-signal gain; Gyrotrons; Magnetic fields; Masers;

fLanguage

English

Publisher

ieee

Conference_Titel

Plasma Science, 1989. IEEE Conference Record - Abstracts., 1989 IEEE International Conference on

Conference_Location

Buffalo, NY, USA

Type

conf

DOI

10.1109/PLASMA.1989.166154

Filename

166154