Extended investigations of isotope effects on ECRH plasma in LHD

Extended investigations of isotope effects on ECRH plasma in LHD
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LHD 中同位素对 ECRH 血浆影响的扩展研究

DOI:
10.1088/1361-6587/ab5bae
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发表时间:
2019
影响因子:
2.2
通讯作者:
Yoshinuma et al
Yoshinuma et al
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tanaka K;Nakata M;Ohtani Y;Tokuzawa T;Yamada H;Warmer F;Nunami M;Satake S;Tala T;Tsujimura T;Takemura Y;Kinoshita T;Takahashi H;Yokoyama M;Seki R;Igami H;Yoshimura Y;Kubo S;Shimozuma T;Akiyama T;Yamada I;Yasuhara R;Funaba H;Yoshinuma et al

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详细研究了 LHD 中 ECRH 等离子体的同位素效应。在核心区域发现 H 和 D 等离子体的输运和湍流特性存在明显差异,在高碰撞状态下归一化半径 ρ < 0.8。另一方面,在低碰撞度情况下,传输和湍流的差异相对较小。功率平衡分析和新古典计算表明,与高碰撞状态下的 H 等离子体相比,D 等离子体中电子和离子传输的异常贡献有所减少。在核心区域,密度调制实验还表明,在高碰撞度状态下,D 等离子体中的粒子扩散比 H 等离子体中的粒子扩散减少更多。与 H 等离子体相比,在 D 等离子体的高碰撞度范围内,离子尺度湍流在 ρ < 0.8 时明显减少。回旋线性分析表明,主要的不稳定性ρ= 0.5 和0.8 是离子温度梯度模式(ITG)。在高碰撞状态下,D 等离子体中 ITG 的线性生长速率比 H 等离子体中降低。这是由于归一化 ITG 和密度梯度较低。 D 等离子体中更空心的密度分布可能是关键的控制参数。目前的分析表明,异常过程在 D 等离子体中形成中空密度分布中发挥了作用,而不是新古典过程。还通过测量和线性回旋模拟研究了电子尺度湍流。
Isotope effects of ECRH plasma in LHD were investigated in detail. A clear difference of transport and turbulence characteristics in H and D plasmas was found in the core region, with normalized radius ρ< 0.8 in high collisionality regime. On the other hand, differences of transport and turbulence were relatively small in low collisionality regime. Power balance analysis and neoclassical calculation showed a reduction of the anomalous contribution to electron and ion transport in D plasma compared with H plasma in the high collisionality regime. In core region, density modulation experiments also showed more reduced particle diffusion in D plasma than in H plasma, in the high collisionality regime. Ion scale turbulence was clearly reduced at ρ< 0.8 in high collisionality regime in D plasma compared with H plasma. The gyrokinetic linear analyses showed that the dominant instability ρ= 0.5 and 0.8 were ion temperature gradient mode (ITG). The linear growth rate of ITG was reduced in D plasma than in H plasma in high collisionality regime. This is due to the lower normalized ITG and density gradient. More hollowed density profile in D plasma is likely to be the key control parameter. Present analyses suggest that anomalous process play a role to make hollower density profiles in D plasma rather than neoclassical process. Electron scale turbulence were also investigated from the measurements and linear gyrokinetic simulations.
研究氢同位素对 Heliotron J 中粒子输运影响的密度调制实验的初步结果
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同位素对紧凑螺旋系统中粒子传输的影响
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发表时间: 2016
影响因子: 2.2
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