One-dimensional simulation on stability of detached plasma in a tokamak divertor
One-dimensional simulation on stability of detached plasma in a tokamak divertor
复制标题
托卡马克偏滤器中脱离等离子体稳定性的一维模拟
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
N. Ohyabu
中科院分区：
文献类型：
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作者：
S. Nakazawa;N. Nakajima;M. Okamoto;N. Ohyabu
采用一维流体代码研究了托卡马克刮除层（SOL）辐射锋的稳定性；与时间相关的输运方程在平行于磁场线的方向上求解。随着从核心进入 SOL 等离子体的能量减少，稳定的附着溶液变成稳定的分离溶液。每当达到这种稳定的分离状态时，强辐射前沿就会与偏滤器目标接触或距偏滤器目标一小段距离。当输入能量进一步减少且总损耗大于输入功率时，辐射前沿开始向 X 点移动，从而冷却 SOL 等离子体。在这种情况下，在我们的参数空间中观察不到位于偏滤器通道中的辐射前沿的解。这在质量上与托卡马克偏滤器实验的结果相对应，该实验显示了辐射锋的运动。
The stability of the radiation front in the scrape-off layer (SOL) of a tokamak is studied with a one-dimensional fluid code; the time-dependent transport equations are solved in the direction parallel to a magnetic field line. As the energy from the core into the SOL plasma is reduced, stable attached solutions change into stable detached solutions. Whenever such stable detached states are attained, the strong radiation front is in contact with or at a small distance from the divertor target. When the input energy is decreased further and total losses become larger than the input power, the radiation front starts to move towards the X-point, cooling the SOL plasma. In such a case, no solutions for the radiation front resting in the divertor channel are observed in our parameter space. This qualitatively corresponds to the results of tokamak divertor experiments which show the movement of the radiation front.