CARM and harmonic gyro-amplifier experiments at 17 GHz

Author

Menninger, W.L. ; Danly, B.G. ; Alberti, S. ; Chen, C. ; Giguet, E. ; Rullier, J.L. ; Temkin, R.J.

Author_Institution

Plasma Fusion Center, MIT, Cambridge, MA, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

2656

Abstract

Cyclotron resonance maser amplifiers are possible sources for applications such as electron cyclotron resonance heating of fusion plasmas and driving high-gradient rf linear accelerators. For accelerator drivers, amplifiers or phase locked-oscillators are required. A 17 GHz cyclotron autoresonance maser (CARM) amplifier experiment and a 17 GHz third harmonic gyro-amplifier experiment are presently underway at the MIT plasma Fusion Center. Using the SRL/MIT SNOMAD II induction accelerator to provide a 380 kV, 180 A, 30 ns flat-top electron beam, the gyro-amplifier experiment has produced 5 MW of rf power with over 50 dB of gain at 17 GHz. The gyro-amplifier operates in the TE₃₁ mode using a third harmonic interaction. Because of its high power output, the gyroamplifier will be used as the rf source for a photocathode rf electron gun experiment also taking place at MIT. Preliminary gyro-amplifier results are presented, including measurement of rf power, gain versus interaction length, and the far-field pattern. A CARM experiment designed to operate in the TE ₁₁ mode is also discussed

Keywords

cyclotron masers; gyrotrons; harmonics; linear accelerators; microwave amplifiers; microwave generation; power amplifiers; 17 GHz; 180 A; 30 ns; 380 kV; 5 MW; SRL/MIT SNOMAD II induction accelerator; TE₁₁ mode; TE₃₁ mode; amplifiers; cyclotron autoresonance maser; cyclotron resonance maser amplifiers; electron cyclotron resonance heating; far-field pattern; flat-top electron beam; fusion plasmas; gyroamplifier; harmonic gyro-amplifier experiments; high-gradient RF linear accelerators; phase locked-oscillators; photocathode RF electron gun; third harmonic gyro-amplifier; third harmonic interaction; Cyclotrons; Electrons; Heating; Masers; Plasma accelerators; Plasma applications; Plasma sources; Radiofrequency amplifiers; Resonance; Tellurium;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309418

Filename

309418