Suitability of millimeter-wave scattering for diagnostics of fusion alpha-particles
Technical Report
·
OSTI ID:5386691
Collective Thomson scattering using long-pulse, millimeter-wave sources is potentially a powerful diagnostic technique of localized alpha particle velocity distribution and density in a fusion tokamak. The combination of a long-pulse and long-wavelength source optimizes the achievable signal to noise ratio of this diagnostic. Additional advantages of millimeter-waves include large scattering angles up to 180/sup 0/, wide-bandwidth receivers, and suitability of millimeter waveguide techniques in a radiation environment. The Doppler broadened scattered spectrum provides an unambiguous measure of the alpha particle parameters even for a scattering plane orientation near perpendicular to the magnetic field because magnetized particle resonances will be averaged out by finite diagnostic beam divergence and frequency resolution. Millimeter-wave accessibility in tokamaks using x-mode propagation at frequencies between the lower x-mode cutoff and the upper hybrid resonance may be a natural consequence of high field tokamak operation. 45 refs., 8 figs., 1 tab.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
- DOE Contract Number:
- AC02-78ET51013
- OSTI ID:
- 5386691
- Report Number(s):
- DOE/ET/51013-230; PFC/RR-87-16; ON: DE88006262
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ALPHA PARTICLES
ASPECT RATIO
CHARGED PARTICLES
CHEMICAL ANALYSIS
COLD PLASMA
DISTRIBUTION FUNCTIONS
DOPPLER BROADENING
FREQUENCY DEPENDENCE
FUNCTIONS
INELASTIC SCATTERING
LINE BROADENING
MAGNETIC FIELDS
NONDESTRUCTIVE ANALYSIS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
PLASMA DIAGNOSTICS
RADIATION SCATTERING ANALYSIS
REFRACTIVITY
SCATTERING
SIGNAL-TO-NOISE RATIO
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
THERMONUCLEAR REACTORS
THOMSON SCATTERING
TOKAMAK TYPE REACTORS
WAVE PROPAGATION
WAVEGUIDES
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ALPHA PARTICLES
ASPECT RATIO
CHARGED PARTICLES
CHEMICAL ANALYSIS
COLD PLASMA
DISTRIBUTION FUNCTIONS
DOPPLER BROADENING
FREQUENCY DEPENDENCE
FUNCTIONS
INELASTIC SCATTERING
LINE BROADENING
MAGNETIC FIELDS
NONDESTRUCTIVE ANALYSIS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
PLASMA DIAGNOSTICS
RADIATION SCATTERING ANALYSIS
REFRACTIVITY
SCATTERING
SIGNAL-TO-NOISE RATIO
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
THERMONUCLEAR REACTORS
THOMSON SCATTERING
TOKAMAK TYPE REACTORS
WAVE PROPAGATION
WAVEGUIDES