Determination of the fast wave electric field using reflectometry on the DIII-D tokamak
- Institute of Plasma and Fusion Research and Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States)
Coherent density fluctuations induced by rf electric fields have been successfully observed using an upgraded reflectometer system on DIII-D. The method utilizes spatially localized X{endash}mode reflectometry (65{endash}73 GHz) measurements to detect coherent density fluctuations driven by the fast wave (FW) electric field. These fluctuations at the FW frequency (60{endash}120 MHz on DIII-D) are detected using heterodyne techniques. The directional nature of the FW launch has been experimentally verified at a position close to the FW antenna; the reflectometer signal is enhanced for a fast wave launch directed towards the detection position. Large spatial and temporal signal variations are observed, which may be related to the detailed internal FW electric field structure. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-89ER51114; FG03-86ER53225
- OSTI ID:
- 284132
- Report Number(s):
- CONF-9505105-; ISSN 0094-243X; TRN: 96:020010
- Journal Information:
- AIP Conference Proceedings, Vol. 355, Issue 1; Conference: 11. topical conference on radio frequency in plasmas, Palm Springs, CA (United States), 17-19 May 1995; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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