Title :
Operation of a megawatt 110 GHz gyrotron with an internal mode converter
Author :
Kreischer, K.E. ; Blank, M. ; Danly, B.G. ; Kimura, T. ; Temkin, R.J.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
Abstract :
High frequency gyrotrons suitable for heating fusion plasmas are presently being investigated at MIT. In tests with a conventional tapered cavity, powers up to 0.84 MW were obtained in the TE/sub 23,6,1/ mode at 113.2 GHz, for an efficiency of 23%. It was found that the most severe mode competition was with other azimuthal TE modes. In later experiments, a mode converter that produces a Gaussian output rf beam was added inside the gyrotron. Diode scans of the output beam indicated that a high quality Gaussian beam of the correct dimensions was produced.<>
Keywords :
cavity resonators; electron beams; gyrotrons; millimetre wave generation; millimetre wave tubes; 0.84 MW; 113.2 GHz; 23 percent; Gaussian output RF beam; MIT; azimuthal TE modes; fusion plasmas; high frequency gyrotrons; high quality Gaussian beam; internal mode converter; mode competition; mode converter; tapered cavity; Electron beams; Electron tubes; Frequency; Gyrotrons; Heating; Magnetic separation; Plasmas; Superconducting coils; Superconducting magnets; Tellurium;
Conference_Titel :
Electron Devices Meeting, 1994. IEDM '94. Technical Digest., International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-2111-1
DOI :
10.1109/IEDM.1994.383421
