Plasma mass density, species mix, and fluctuation diagnostics using a fast Alfven wave

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

DOI:https://doi.org/10.1063/1.1147610· OSTI ID:451783

Ikezi, H; deGrassie, J S; Pinsker, R I; Snider, R T ^[1]

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1. General Atomics, San Diego, California 92186-9784 (United States)

We propose use of a fast Alfven wave interferometer and reflectometer as a tokamak diagnostic to measure the plasma mass density, D{endash}T species mix profile, and density fluctuations. Utilizing the property that the phase velocity of the fast wave propagating across the magnetic field is the Alfven speed with thermal correction, this fast wave interferometer on the DIII-D tokamak was successfully used to obtain the line integrated density. Since the position of the ion{endash}ion hybrid cutoff in tokamaks is uniquely determined by the species mix ratio and wave frequency, the reflectometer arrangement finds the species mix profile. The inversion method of reflectometry is discussed. The multiple chord interferometer also measures the mass density fluctuation profile. {copyright} {ital 1997 American Institute of Physics.}

• Research Organization: General Atomics
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 451783
• 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
ALFVEN WAVES
CONCENTRATION RATIO
FLUCTUATIONS
HYDROGEN ISOTOPES
INTERFEROMETRY
PHASE VELOCITY
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA RADIAL PROFILES
REFLECTION
REFRACTIVE INDEX
TOKAMAK DEVICES