A method of particle transport study using supersonic molecular beam injection and microwave reflectometry on HL-2A tokamak

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3274201· OSTI ID:22053620

Xiao, W W; Ding, X T; Dong, J Q; Yao, L H; Liu, Z T; Gao, Y D; Feng, B B; Song, X M; Yang, Q W; Yan, L W; Liu, Yi; Duan, X R; Pan, C H; Yong, Liu ^[1]; Zou, X L; Song, S D ^[2]

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1. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China)
2. CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France)

A method of the particle transport study using supersonic molecular beam injection (SMBI) and microwave reflectometry is reported in this paper. Experimental results confirm that pulsed SMBI is a good perturbation source with deeper penetration and better localization than the standard gas puffing. The local density modulation is induced using the pulsed SMBI and the perturbation density is measured by the microwave reflectometry. Using Fourier transform analysis for the local density perturbation, radial profiles of the amplitude and phase of the density modulation can be obtained. The experimental results in HL-2A show that the particle injected by SMBI is located at about r/a=0.65-0.75. The position of the main particle source can be determined through three aspects: the minimum of the phase of the first harmonic of the Fourier transform of the modulated density measured by microwave reflectometry; the H{sub a} intensity profile and the local density increase ratio. The maximum of the amplitude of the first harmonic shifts often inward relative to the particle source location, which indicates clearly there is an inward particle pinch in this area. Good agreement has been found between the experimental results and the simulation using analytical transport model. The particle diffusivity D and the particle convection velocity V have been obtained by doing this simulation. The sensitivity in the transport coefficients of the amplitude and the phase of the density modulation has been discussed.

• OSTI ID: 22053620
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 1; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
BEAM INJECTION
FOURIER TRANSFORMATION
HL-2A TOKAMAK
MICROWAVE RADIATION
MODULATION
MOLECULAR BEAMS
NEUTRAL-PARTICLE TRANSPORT
PARTICLE SOURCES
REFLECTION
SENSITIVITY
SIMULATION
TRANSPORT THEORY