Title :
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
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;
Conference_Titel :
Plasma Science, 1989. IEEE Conference Record - Abstracts., 1989 IEEE International Conference on
Conference_Location :
Buffalo, NY, USA
DOI :
10.1109/PLASMA.1989.166154
