Title :
Initial results from the multi-megawatt 110 GHz ECH system for the DIII-D tokamak
Author :
Callis, R.W. ; Lohr, John ; O´Neill, R.C. ; Ponce, Dan ; Prater, Ron ; Daquing Zhang
Author_Institution :
Gen. Atomics, San Diego, CA, USA
Abstract :
Summary form only given, as follows. The first of three MW-level 110 GHz ECH systems was operated on the DIII-D tokamak in late 1996. Two additional units will be commissioned during 1997. Each gyrotron is connected to the tokamak by a low-loss-windowless evacuated transmission line using circular corrugated waveguide carrying the HE/sub 11/ mode. The microwave beam spot is well focused with a spot size of approximately 6 cm and can be steered poloidally from the center to the outer edge of the plasma. The initial operation with about 0.5 MW delivered to a low density plasma for 0.5 s showed good central electron heating with peak temperature in excess of 10 keV. The system status is described and the initial physics results are presented, including heating efficiencies, power deposition profiles, and overall system performance.
Keywords :
Tokamak devices; circular waveguides; gyrotrons; millimetre wave devices; plasma radiofrequency heating; plasma temperature; plasma toroidal confinement; waveguide components; 0.5 MW; 0.5 s; 10 keV; 110 GHz; DIII-D tokamak; ECH system; HE/sub 11/ mode; circular corrugated waveguide; electron heating; gyrotron; heating efficiencies; low density plasma; low-loss-windowless evacuated transmission line; microwave beam spot; power deposition profiles; spot size; system performance; Electromagnetic heating; Electrons; Gyrotrons; Helium; Particle beams; Plasma density; Plasma temperature; Plasma waves; Power transmission lines; Tokamaks;
Conference_Titel :
Plasma Science, 1997. IEEE Conference Record - Abstracts., 1997 IEEE International Conference on
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-3990-8
DOI :
10.1109/PLASMA.1997.604391
