Advanced tokamak research on long time scales in JT-60 Upgradea)

Advanced tokamak research on long time scales in JT-60 Upgradea)
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JT-60 Upgrade 中长时间尺度的先进托卡马克研究a)

DOI:
10.1063/1.2187967
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发表时间:
2006
期刊:
影响因子:
2.2
通讯作者:
Jt U Team
Jt U Team
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
T. Fujita;Jt U Team

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JT-60升级装置(JT-60 U)先进托卡马克等离子体运行的持续时间[A. Kitsunezaki等人,融合科学Technol.42,179(2002)]已经在超过当前扩散时间(τ R)并且接近壁饱和时间的长时间尺度上扩展。75%的极高自举电流分数(fBS)维持7.4 s(2.7 τ R),而2.5的归一化β维持15.5 s(≤ 9.5 τ R)。对于小的fBS区域,电流分布达到在π τ R中的稳定条件,而对于大的fBS区域,需要更长的时间。等离子体与弱剪切q分布,类似于ITER稳态运行方案的要求,成功地保持。观察到壁中的粒子库存饱和在重复的长脉冲(1030 s)的H -模式放电与边缘本地化模式。对刮层等离子体中中性粒子的分析表明,壁面饱和存在不同的时间尺度。铁素体钢瓦已被安装在...
The duration of advanced tokamak plasma operation in JT-60 Upgrade (JT-60U) [A. Kitsunezaki et al., Fusion Sci. Technol. 42, 179 (2002)] has been extended on long time scales exceeding the current diffusion time ( τ R ) and close to the wall saturation time. A very high bootstrap current fraction ( f BS ) of 75% was maintained for 7.4 s ( 2.7 τ R ) , while a normalized beta of 2.5 was maintained for 15.5 s ( ∼ 9.5 τ R ) . The current profile reaches stationary conditions in ∼ τ R for the small f BS regime, while a longer time is required for the large f BS regime. A plasma with a weak shear q profile, similar to requirements for the ITER steady-state operational scenario, was successfully maintained. The particle inventory in the wall was observed to saturate in repeated long-pulse ( ∼ 30 s ) H -mode discharges with edge localized modes. The analysis of neutral particles in the scrape-of-layer plasma indicates different time scales are involved for the wall saturation. Ferritic steel tiles have been insta...
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