Results from the low-power 60 GHz gyrotron collective Thomson scattering diagnostic on TFTR

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

DOI:https://doi.org/10.1063/1.1147605· OSTI ID:451778

Machuzak, J S; Woskov, P P; Gilmore, J ^[1]; Bretz, N L; Park, H K ^[2]; Bindslev, H ^[3]

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1. MIT Plasma Fusion Center, Cambridge, Massachusetts 02139 (United States)
2. Plasma Physics Laboratory, Princeton University, James Forrestal Campus, Princeton, New Jersey 08534 (United States)
3. JET Joint Undertaking, Abingdon, Oxon OX14 3EA (United Kingdom)

A low-power 60 GHz gyrotron collective Thomson scattering diagnostic has been operating on TFTR to test the feasibility of detecting alpha particles when scattering perpendicular to the magnetic field. An enhanced scattered signal is predicted to result from the interaction of the energetic ions with plasma resonances in the lower hybrid frequency range. Millimeter-wave power levels at the plasma were approximately 200 W for typical pulse lengths of 50 ms. Deuterium and possible fusion product ion cyclotron frequencies and their harmonics were observed during neutral beam heating. These spectra are similar to ion cyclotron emission spectra which are detected with radio-frequency probes on TFTR at the plasma edge. Also, ion cyclotron resonance heating fundamental and harmonic fluctuations were observed. However, a signal has not been definitively detected in the lower hybrid frequency range which correlates to alpha particles. Broadband noise was observed during neutral beam heating which is greater than the predicted alpha particle signal. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 451778
• 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
ALPHA PARTICLES
BEAM INJECTION HEATING
DEUTERIUM
FLUCTUATIONS
HARMONICS
ICR HEATING
MICROWAVE TUBES
NOISE
PLASMA DIAGNOSTICS
TFTR TOKAMAK
THOMSON SCATTERING