Application of millimeter-wave scattering to diagnostics of fusion alphas

Conference · Sat Nov 01 04:00:00 EST 1986

OSTI ID:6833613

Woskoboinikow, P; Cohn, D R; Machuzak, J S; Temkin, R J

Millimeter-wave collective Thomson scattering from ion thermal fluctuations can be a powerful technique for the measurement of localized alpha density and velocity distribution in an ignition tokamak. Recent advances in high-power, long-pulse millimeter-wave sources such as the gyrotron have made this possible. Scattered signal levels in WHz/sup -1/ scale as wavelength to the 3/2 power and signal to noise ratio is proportional to the square root of integration time. 100 kW, 10 ms source power at the plasma would be sufficient for diagnostics of fusion alphas in the proposed compact ignition tokamak (CIT) (N/sub ..cap alpha../ approx. = 10/sup 13/cm/sup -3/). A frequency between the plasma frequency and the electron cyclotron resonance, approx.130 to 290 GHz may provide the best plasma accessibility for this diagnostic as well as microinstability studies. Millimeter-wave scattering experience in tokamaks and mirrors indicte that edge turbulence should not be a serious impediment. Refraction uncertainties could be minimized by appropriate choice of scattering geometry.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 6833613
• Report Number(s): DOE/ET/51013-201; PFC/CP-86-16; CONF-861110-3; ON: DE87005997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ALPHA PARTICLES
CHARGED PARTICLES
CLOSED PLASMA DEVICES
COMPACT IGNITION TOKAMAK
DISTRIBUTION
ELECTROMAGNETIC RADIATION
INELASTIC SCATTERING
MICROWAVE RADIATION
PLASMA DIAGNOSTICS
RADIATIONS
SCATTERING
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
THOMSON SCATTERING
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
VELOCITY