TFTR 60 GHz alpha particle collective Thomson Scattering diagnostic

Conference · Wed Mar 01 04:00:00 EST 1995

OSTI ID:32582

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. Massachusetts Inst. of Tech., Cambridge, MA (United States)
2. Princeton Univ., NJ (United States). Plasma Physics Lab.
3. Lodestar Research Corp., Boulder, CO (United States)
4. JET Joint Undertaking, Abingdon (United Kingdom)

A 60 GHz gyrotron collective Thomson Scattering alpha particle diagnostic has been implemented for the D-T period on TFM. Gyrotron power of 0.1-1 kW in pulses of up to 1 second can be launched in X-mode. Efficient corrugated waveguides are used with antennaes 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/sec digitizer is 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 the alpha particles with plasma resonances in the lower hybrid frequency range. Significant enhancements are expected, which will make these measurements possible with gyrotron power less than 1 kW, while maintaining an acceptable signal to noise ratio. We hope to extract alpha particle density and velocity distribution functions from the data. The D and T fuel densities and temperatures may also be obtainable by measurement of the respective ion cyclotron harmonic frequencies.

• Research Organization: Princeton Univ., NJ (United States). Plasma Physics Lab.
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 32582
• Report Number(s): PPPL--3066; CONF-940552--36; ON: DE95008709
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALPHA PARTICLES
ANTENNAS
MICROWAVE AMPLIFIERS
PLASMA DIAGNOSTICS
TFTR TOKAMAK
THOMSON SCATTERING
WAVEGUIDES