Performance evaluation of the TFTR gyrotron CTS diagnostic for alpha particles

• Published in: Review of Scientific Instruments 1992-10, Vol.63 (10), p.4644-4646
• Main Authors: Rhee, D. Y., Cohn, D. R., Machuzak, J. S., Woskov, P., Bretz, N., Budny, R., Efthimion, P. C., Park, H. K.
• Format: Article
• Language: English
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 700330 - Plasma Kinetics, Transport, & Impurities- (1992-); ALPHA PARTICLES; CHARGED PARTICLES; CLOSED PLASMA DEVICES; CYCLOTRON RESONANCE; ELECTRON CYCLOTRON-RESONANCE; ELECTRON EMISSION; EMISSION; ENERGY SPECTRA; Exact sciences and technology; INELASTIC SCATTERING; MONTE CARLO METHOD; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Plasma diagnostic techniques and instrumentation; PLASMA DIAGNOSTICS; PLASMA SIMULATION; RESONANCE; SCATTERING; SIGNAL-TO-NOISE RATIO; SIMULATION; SPECTRA; TFTR TOKAMAK; THERMONUCLEAR DEVICES; THOMSON SCATTERING; TOKAMAK DEVICES
• ISSN: 0034-6748; 1089-7623
• DOI: 10.1063/1.1143646

A large‐angle, 60‐GHz collective Thomson scattering (CTS) diagnostic system for localized measurements of DT alpha‐particle velocity distribution and fraction is being implemented on TFTR. Calculations of expected CTS spectra, signal‐to‐noise ratio per receiver channel, and estimated error in determining the temperature and fraction of alpha particles are being carried out. The experimental spectra are simulated by adding noise to the theoretical calculation by a Monte Carlo technique. Error analysis is then performed by using a relative intensity calibrated nonlinear curve fitting code to calculate the desired plasma parameters (T i , T α, n α/n i ). Simulation results indicate that expected background emission of 20 eV during Supershot in TFTR poses no problem to the experiment. Also short integration times (