Determination of internal radio frequency electric field profiles via millimeter wave reflectometry in the DIII-D Tokamak

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1147606· OSTI ID:451779

Lee, J H; Doyle, E J ^[1]; Luhmann, N C ^[2]; Peebles, W A ^[1]; Petty, C C; Pinsker, R I ^[3]; Rhodes, T L ^[1]

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1. Department of Electrical Engineering and Institute of Plasma and Fusion Research, University of California, Los Angeles, California 90095 (United States)
2. Department of Applied Science, University of California, Davis, California 95616 (United States)
3. General Atomics, San Diego, California 92186 (United States)

Millimeter wave reflectometry was employed to determine radio frequency wave electric field profiles in the DIII-D Tokamak. The method utilizes spatially localized X-mode reflectometer measurements in the 65{endash}73 GHz frequency range to detect coherent fluctuations in magnetic field and density driven at the fast magnetosonic wave (FW) frequency (60 MHz). The FW electric field profiles were determined by adopting a geometric optics approach, which is appropriate for interpreting reflectometer data where the perturbing wavelength is longer than the probing wavelength. Successful measurements from this system were utilized to investigate FW propagation effects on DIII-D. The FW launch directionality necessary for current drive was confirmed at a position toroidally close to the FW antenna. {copyright} {ital 1997 American Institute of Physics.}

• DOE Contract Number: FG03-86ER53225
• OSTI ID: 451779
• Report Number(s): CONF-960543--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 68; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRIC FIELDS
FLUCTUATIONS
GHZ RANGE 01-100
ITER TOKAMAK
MAGNETIC FIELDS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA WAVES
REFLECTION
RF SYSTEMS
microwave reflectometry