2008
DOI: 10.1088/0741-3335/50/3/035006
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Study of confinement and LHCD efficiency on the HT-7 tokamak

Abstract: High power heating of a lower hybrid wave (LHW) was performed (P LHW ∼ 800 kW at 2.45 GHz) recently in the HT-7 tokamak. Lower hybrid current drive (LHCD) efficiency is studied for different injected powers and for different densities. Improved particle confinement is observed by the application of LHCD as characterized by an increase in the central line averaged electron density and the decrease in D α emission. The particle confinement time (τ p ) increased by about 1.5 times. The dependence of energy confin… Show more

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Cited by 17 publications
(15 citation statements)
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“…But such changes for 7^/= 36kA occur at higher level of the temperatures. Observed values of rjexp and the normalized driven current 7?/RF/PRF for low plasma density turn out to be of the same scale as those observed at larger tokamaks [8,9], where more optimal conditions for LHCD experiments are realized, that is higher frequencies (a few GHz), multi-junction antennas and etc. The main plasma parameters changes during LHCD experiment with Ipi~ 36kA are presented in the Figure 4.…”
Section: Scan Experiments For CD Efficiencysupporting
confidence: 55%
“…But such changes for 7^/= 36kA occur at higher level of the temperatures. Observed values of rjexp and the normalized driven current 7?/RF/PRF for low plasma density turn out to be of the same scale as those observed at larger tokamaks [8,9], where more optimal conditions for LHCD experiments are realized, that is higher frequencies (a few GHz), multi-junction antennas and etc. The main plasma parameters changes during LHCD experiment with Ipi~ 36kA are presented in the Figure 4.…”
Section: Scan Experiments For CD Efficiencysupporting
confidence: 55%
“…The parallel refractive index of LHW could be varied from 1.85 to 2.6 by phase adjustment. The LHCD efficiency (typically in L mode plasma) has been investigated in ASIPP with quite a few studies [26,27] and references there in. The experimental LHCD efficiency, η exp , is defined as n e I LH R/P LH , where n e is the plasma density, I LH is the driven current by the lower hybrid wave injection, R is the major radius of EAST, P LH is the LHW power.…”
Section: Current Calculations For Long Pulse H-mode Plasmas Using Rf mentioning
confidence: 99%
“…The plasma current, position and central line-averaged electron density are feedback controlled during discharges. A stainless-steel liner has been installed in the vacuum chamber at the radius of 0.32m [12,13]. A lower hybrid wave (LHW) power up to 0.6MW at 2.45GHz is available in the HT-7 tokamak.…”
Section: Experimental Set-upmentioning
confidence: 99%