Effect of gas puffing from different side on lower hybrid wave-plasma coupling in experimental advanced superconductive tokamak

Ding, Bingjun; Kong, E. H.; Zhang, T.; Li, M. H.; Zhang, L.; Wei, W.; Li, Y. C.; Wu, Jinyong; Xu, Guoliang; Zhao, Hengyu; Wang, M.; Gong, Xianzu; Shan, Jiafang; Liu, F. K.; Team, East

doi:10.1063/1.4824447

Cited by 9 publications

(17 citation statements)

References 15 publications

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“…Similar results (Ding et al. 2013 a , b , 2015) have also been reported in EAST. Some possible mechanisms, including collisional absorption (CA) (Bonoli & Englade 1986), parametric instabilities (PI) (Liu & Tripathi 1986; Cesario et al.…”

Section: Lhcd Capability At High Densitysupporting

confidence: 87%

“…Also, in EAST, with the 2.45 GHz LHCD system, local gas puffing from the electron drift side (GIM_e) and ion drift side (GIM_i), as shown in figure 2, was studied (Ding et al. 2013 a , b ). The experimental results are shown in figure 3, indicating the effect of gas puffing on coupling improvement from the electron drift side is better than that from the ion drift side.…”

Section: Issue Of Lhw–plasma Couplingmentioning

confidence: 99%

“…The difference in the edge density between electron- and ion-side cases suggests that local ionization of puffed gas plays a dominant role in affecting the grill density due to different movement direction of ionized electrons and that part of gas has been locally ionized near the gas pipe before diffusing into the grill region (Ding et al. 2013 a , b ).…”

Section: Issue Of Lhw–plasma Couplingmentioning

confidence: 99%

“…2011, 2015) and 4.6 GHz (6 MW) (Ding et al. 2013 a , b ). Typical spectra calculated by an advanced lower hybrid antenna (ALOHA) (Hillairet et al.…”

Section: Introductionmentioning

confidence: 99%

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Studies of challenge in lower hybrid current drive capability at high density regime in experimental advanced superconducting tokamak

Ding

et al. 2017

J. Plasma Phys.

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Aiming at a fusion reactor, two issues must be solved for the lower hybrid current drive (LHCD), namely good lower hybrid wave (LHW)-plasma coupling and effective current drive at high density. For this goal, efforts have been made to improve LHW-plasma coupling and current drive capability at high density in experimental advanced superconducting tokamak (EAST). LHW-plasma coupling is improved by means of local gas puffing and gas puffing from the electron side is taken as a routine way for EAST to operate with LHCD. Studies of high density experiments suggest that low recycling and high lower hybrid (LH) frequency are preferred for LHCD experiments at high density, consistent with previous results in other machines. With the combination of 2.45 GHz and 4.6 GHz LH waves, a repeatable high confinement mode plasma with maximum density up to 4.5 × 10 19 m −3 was obtained by LHCD in EAST. In addition, in the first stage of LHCD cyclic operation, an alternative candidate for more economical fusion reactors has been demonstrated in EAST and further work will be continued.

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Section: Lhcd Capability At High Densitysupporting

confidence: 87%

Section: Issue Of Lhw–plasma Couplingmentioning

confidence: 99%

Section: Issue Of Lhw–plasma Couplingmentioning

confidence: 99%

“…2011, 2015) and 4.6 GHz (6 MW) (Ding et al. 2013 a , b ). Typical spectra calculated by an advanced lower hybrid antenna (ALOHA) (Hillairet et al.…”

Section: Introductionmentioning

confidence: 99%

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Studies of challenge in lower hybrid current drive capability at high density regime in experimental advanced superconducting tokamak

Ding

et al. 2017

J. Plasma Phys.

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“…23,24 The results suggest that gas puffing from the electron-side is more efficient for improving LHW-plasma coupling. As shown in Figs.…”

Section: Optimization Of Lhcd In Eastmentioning

confidence: 81%

Lower hybrid current drive and ion cyclotron range of frequencies heating experiments in H-mode plasmas in Experimental Advanced Superconducting Tokomak

et al. 2014

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An ion cyclotron range of frequencies (ICRF) system with power up to 6.0 MW and a lower hybrid current drive (LHCD) system up to 4 MW have been applied for heating and current drive experiments in Experimental Advanced Superconducting Tokomak (EAST). Significant progress has been made with ICRF heating and LHCD for realizing the H-mode plasma operation in EAST. During 2010 and 2012 experimental campaigns, ICRF heating experiments were carried out at the fixed frequency of 27MHz, achieving effective ions and electrons heating with the H minority heating (H-MH) mode. The H-MH mode produced good plasma performance, and realized H-mode using ICRF power alone in 2012. In 2010, H-modes were generated and sustained by LHCD alone, where lithium coating and gas puffing near the mouth of the LH launcher were applied to improve the LHCD power coupling and penetration into the core plasmas of H-modes. In 2012, the combination of LHCD and ICRH power extended the H-mode duration up to over 30 s. H-modes with various types of edge localized modes (ELMs) have been achieved with HIPB98(y, 2) ranging from 0.7 to over unity. A brief overview of LHCD and ICRF Heating experiment and their application in achieving H-mode operation during these two campaigns will be presented.

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Experimental advanced superconducting tokamak

Wan

2016

Magnetic Fusion Energy

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Effect of gas puffing from different side on lower hybrid wave-plasma coupling in experimental advanced superconductive tokamak

Cited by 9 publications

References 15 publications

Studies of challenge in lower hybrid current drive capability at high density regime in experimental advanced superconducting tokamak

Studies of challenge in lower hybrid current drive capability at high density regime in experimental advanced superconducting tokamak

Lower hybrid current drive and ion cyclotron range of frequencies heating experiments in H-mode plasmas in Experimental Advanced Superconducting Tokomak

Experimental advanced superconducting tokamak

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