TFTR 60 GHz alpha particle collective Thomson scattering diagnostic

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146323· OSTI ID:6711806

Machuzak, J S; Woskov, P P; Gilmore, J ^[1]; Bretz, N L; Park, H K ^[2]; Aamodt, R E; Cheung, P Y; Russell, D A ^[3]; Bindslev, H ^[4]

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1. MIT Plasma Fusion Center, Cambridge, Massachusetts 02139 (United States)
2. Princeton University, Plasma Physics Laboratory, James Forrestal Campus, P.O. Box 451, Princeton, New Jersey 08543 (United States)
3. Lodestar Research Corporation, 2400 Central Avenue, P-5, Boulder, Colorado 80301 (United States)
4. JET Joint Undertaking, Abingdon, Oxon OX14 3EA (United Kingdom)

A 60 GHz gyrotron collective Thomson scattering alpha particle diagnostic has been implemented for the D-T period on the Tokamak Fusion Test Reactor (TFTR). Gyrotron power of 0.1--1 kW in pulses of up to 1 s can be launched in [ital X] mode. Efficient corrugated waveguides are used with antennas and vacuum windows of the TFTR Microwave Scattering system. A multichannel synchronous detector receiver system and spectrum analyzer acquire the scattered signals. A 200 megasample/s digitizer and spectrum analyzer are used to resolve fine structure in the frequency spectrum. By scattering nearly perpendicular to the magnetic field, this experiment will take advantage of an enhancement of the scattered signal which results from the interaction of energetic ions with plasma resonances in the lower hybrid frequency range. Significant enhancements are expected with D-T fusion alpha particles, which should be detectable with gyrotron power of less than 1 kW, while maintaining an acceptable signal-to-noise ratio. This diagnostic will be the first experimental test of recent collective Thomson scattering models and should also provide an indication of the presence of energetic alpha particles in the core of TFTR.

• OSTI ID: 6711806
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:1; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
ALPHA PARTICLES
ALPHA SPECTRA
CHARGED PARTICLES
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
INELASTIC SCATTERING
MICROWAVE RADIATION
PLASMA DIAGNOSTICS
RADIATIONS
SCATTERING
SPECTRA
TFTR TOKAMAK
THERMONUCLEAR DEVICES
THOMSON SCATTERING
TOKAMAK DEVICES