Determination of the fast wave electric field using reflectometry on the DIII-D tokamak

Journal Article · Thu Feb 01 04:00:00 EST 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.49577· OSTI ID:284132

Lee, J H; Doyle, E J; Peebles, W A; Rhodes, T L; Luhmann, Jr, N C; Ikezi, H; Petty, C C; Pinsker, R I ^[1]

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1. 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
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-89ER51114; FG03-86ER53225
• OSTI ID: 284132
• Report Number(s): CONF-9505105--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 355; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CURRENT-DRIVE HEATING
ELECTRIC FIELDS
FLUCTUATIONS
GHZ RANGE 01-100
MICROWAVE EQUIPMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
TOKAMAK DEVICES