2001
DOI: 10.1088/0029-5515/41/11/312
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High performance discharges near the operational limit in HT-7

Abstract: Efforts have been made on the HT-7 tokamak to extend the stable operation boundaries. Extensive RF boronization and siliconization have been used and a wider operational Hugill diagram has been obtained. The transit density reached 1.3 times the Greenwald density limit in ohmic discharges. A stationary high performance discharge with qa = 2.1 has been obtained after siliconization. Confinement improvement was obtained as a result of the significant reduction of electron thermal diffusivity χe in the outer… Show more

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Cited by 8 publications
(4 citation statements)
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“…The lower hybrid current drive (LHCD) system consisted of a multijunction grill (4×12), a 1.2 MW wave system with a frequency of 2.45 GHz. Efforts have been made for steady state operation and many good results have been obtained during the past few years [11,12]. The longest plasma duration was over 300 s by LHCD with a central electron temperature of 1 keV.…”
Section: Experimental Set-up and Main Resultsmentioning
confidence: 99%
“…The lower hybrid current drive (LHCD) system consisted of a multijunction grill (4×12), a 1.2 MW wave system with a frequency of 2.45 GHz. Efforts have been made for steady state operation and many good results have been obtained during the past few years [11,12]. The longest plasma duration was over 300 s by LHCD with a central electron temperature of 1 keV.…”
Section: Experimental Set-up and Main Resultsmentioning
confidence: 99%
“…[11][12][13] It is not easy to get high performance steady-state H-mode in HT-7 due to several problems, such as magnetohydrodynamic ͑MHD͒ instability, high impurity radiation, and edge recycling. The features of IBW and LHCD are integrated to obtain long pulse high performance discharges by proper optimization of operation, particularly, choosing a strategy to avoid MHD activities.…”
Section: Resultsmentioning
confidence: 99%
“…The important role of first wall conditioning in reducing plasma impurities has been recognized for decades and efforts have been made to control impurities in most tokamaks [19][20][21][22][23][24]. GDC boronization was used in EAST, and the plasma performance was improved afterwards.…”
Section: Gdc Boronization and Extended Limitsmentioning
confidence: 99%
“…Most of the stable sawtooth discharges were achieved after the second GDC boronization. The ICRF boronization technology [19,20] will be used in the next experimental campaign on EAST.…”
Section: Gdc Boronization and Extended Limitsmentioning
confidence: 99%