ASIPP 2007-10-121 YOUNIS Jawad, WAN Baonian, LIN Shiyao, SHI Yuejiang, and HT-7 Team HT-7 Study of...
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Transcript of ASIPP 2007-10-121 YOUNIS Jawad, WAN Baonian, LIN Shiyao, SHI Yuejiang, and HT-7 Team HT-7 Study of...
ASIPP 2007-10-12 1
YOUNIS Jawad, WAN Baonian, LIN Shiyao, SHI Yuejiang, and HT-7 Team
HT-7
Study of LHW current drive efficiency and
fast electron distribution function
ASIPP 2007-10-12 2
Motivations Compare the experimental FEB spectra with simulation Investigate the dependence of photon temperature on loop voltage
with fixed plasma parameters. Investigate the dependence of photon temperature on plasma
parameters To get the precise HXR profile data. Reach LHW current drive efficiency with zero loop voltage even
negative loop voltage. Investigate the dependence of photon temperature on loop voltage
with different plasma parameters. Study the relation between photon
temperature and the fast electron distribution function.
HT-7
ASIPP 2007-10-12 3
Plasma parameters
HT-7
Ip= 80-200 kA
ne= 0.5- 3.0*1019m-3
LHW power scan from 60 to 500kW in steps
LHW phase velocity scan: n//=1.8, 2.35, 2.9, 3.45
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HT-7
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HT-7
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HT-7
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HT-7
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HT-7
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SummaryIn summary, dependence of Tph on plasma parameters is investigated
experimentally. The photon temperature increases with increasing plasma current at constant LH power and plasma density due to increased loop voltage. Due to the stronger slow down process at higher density, the Tph decreases with
increasing plasma density at constant LH power and plasma current although the loop voltage increased. In LH wave phase scan and power scan experiments, no appreciable change in the Tph is observed. The asymmetry in
the distribution function describes the driven current and estimates the photon temperature by two parameters, one is cutoff energy and the other is fast electron population. The results in current, density and phase scan experiment are quantitatively in good agreement with the simulation results.
The maximum CD efficiency is found to be 2.5 E19 .The full CD and over CD is obtained with low plasma parameters.
HT-7
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Thanks for attention