Study of confinement and LHCD efficiency on the HT-7 tokamak

Gao, Xiang; Xu, Qianfan; Li, J G; Shan, Jiafang; Hu, Liqun; Zhao, Jun

doi:10.1088/0741-3335/50/3/035006

Cited by 17 publications

(15 citation statements)

References 16 publications

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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%

Study of LHCD efficiency on the FT-2 tokamak

Lashkul¹,

Altukhov²,

Gurchenko³

et al. 2009

AIP Conference Proceedings

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The paper pays the main attention to the LHCD efficiency in experiments on the FT-2 tokamak. LH wave spectra P(NJ excited by the grill computed by GRILL3D code are presented. Physical processes responsible for termination of the CD with density rise are discussed for lower and higher plasma currents that are for relatively cold and relatively hot plasmas. A role of parametric processes and additional impurity influx for CD switching-off in the plasma are considered for those conditions.

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Section: Scan Experiments For CD Efficiencysupporting

confidence: 55%

Study of LHCD efficiency on the FT-2 tokamak

Lashkul¹,

Altukhov²,

Gurchenko³

et al. 2009

AIP Conference Proceedings

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“…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%

Long Pulse H-Mode Scenarios Sustained by RF Heating on EAST

Gao

Zhang

et al. 2015

Plasma Sci. Technol.

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EAST has demonstrated its capability of long pulse operation using RF heating (LHCD and ICRF) in past experiments. One key issue to realize the long pulse H-mode experiments is to sustain the plasma current for steady state operation. Based on the calculations of the transport code ONETWO and its coupled RF code GENRAY, two scenarios have been proposed to achieve the 10 s H-mode plasma with Ip=400 kA, < ne >=4.5×10 19 m −3 , βN=2, and the 100 s H-mode plasma with Ip=280 kA, < ne >=3.5×10 19 m −3 , βN =1.8 recently. The current drive of lower hybrid wave is an important issue in the two scenarios. An experimental result on lower hybrid current drive in H-mode plasmas on EAST is also presented.

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“…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%

Observation of Runaway Electron Behaviour During Disruptions in LHCD Discharges in the HT‐7 Tokamak

et al. 2010

Contrib. Plasma Phys.

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Production of runaway electrons during disruptions has been observed in the HT-7 Tokamak. The runaway current plateaus, which can carry part of the pre-disruptive current, are observed in lower-hybrid current drive (LHCD) limiter discharges. It is found that the runaway current can mitigate the disruptions effectively. We can use gas puffing to increase the line-averaged density to restrain the runaway electrons and rebuild the plasmas after the disruptions. Detailed observations are presented on the runaway electrons generated following disruptions in the HT-7 tokamak discharges. The results indicate that the magnetic oscillations play a significant role in the loss of runaway electrons in disruptions. There are two important preconditions to rebuild plasmas by runaway electrons after the disruptions. One of them are weak magnetic oscillations; another one are LHWs (lower-hybrid waves).

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Study of confinement and LHCD efficiency on the HT-7 tokamak

Cited by 17 publications

References 16 publications

Study of LHCD efficiency on the FT-2 tokamak

Study of LHCD efficiency on the FT-2 tokamak

Long Pulse H-Mode Scenarios Sustained by RF Heating on EAST

Observation of Runaway Electron Behaviour During Disruptions in LHCD Discharges in the HT‐7 Tokamak

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