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首页> 外文期刊>Plasma physics and controlled fusion >The role of particle, energy and momentum losses in 1D simulations of divertor detachment
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The role of particle, energy and momentum losses in 1D simulations of divertor detachment

机译：粒子，能量和动量损失的角色在1D模拟中的转向器分离

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摘要

A new 1D divertor plasma code, SD1D, has been used to examine the role of recombination, radiation, and momentum exchange in detachment. Neither momentum or power losses by themselves are found to be sufficient to produce a reduction in target ion flux in detachment (flux rollover); radiative power losses are required to (a) limit and reduce the ionisation source and (b) access low-target temperature, T-target, conditions for volumetric momentum losses. Recombination is found to play a small role at flux rollover, but as T-target drops to temperatures around 1 eV, it becomes a strong ion sink. In the case where radiative losses are dominated by hydrogen, the detachment threshold is identified as a minimum gradient of the energy cost per ionisation with respect to T-target. This is also linked to thresholds in T-target and in the ratio of upstream pressure to power flux. A system of determining the detached condition is developed such that the divertor solution at a given T-target (or lack of one) is determined by the simultaneous solution of two equations for target ion current-one dependent on power losses and the other on momentum. Depending on the detailed momentum and power loss dependence on temperature there are regions of T-target where there is no solution and the plasma 'jumps' from high to low T-target states. The novel analysis methods developed here provide an intuitive way to understand complex detachment phenomena, and can potentially be used to predict how changes in the seeding impurity used or recycling aspects of the divertor can be utilised to modify the development of detachment.
机译：新的1D Ververtor等离子代码SD1D已被用于检查分离中重组，辐射和动量交换的作用。由于自己的动力或功率损失都没有足以在分离中产生靶离子通量的减少（助焊剂翻转）; （a）限制并减少电离源和（b）进入低目标温度，t-靶，体积动量损失条件的辐射功率损失。发现重组在助焊剂翻转中发挥着小的作用，但随着T-Target下降到1eV的温度下降，它变成了强的离子水槽。在辐射损失由氢主导的情况下，脱离阈值被鉴定为相对于T-靶的电离能量成本的最小梯度。这也与T靶标的阈值相关联，并且以上游压力与电量的比率相连。开发了确定分离条件的系统，使得在给定T-靶（或缺少一个）处的转栓溶液由同时解决目标离子电流的两个方程的溶液，取决于功率损耗，另一个在动量上的另一个方程。根据详细的动力和功率损失依赖性，T-Target的区域在没有解决方案中，并且从高到低T靶状态的等离子体'跳跃'。这里开发的新型分析方法提供了了解复杂的脱离现象的直观方式，并且可以用于预测所用或回收方向的种子杂质或回收方面的变化来改变分离的发展。

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  • 作者

    Dudson B. D.; Allen J.; Body T.; Chapman B.; Lau C.; Townley L.; Moulton D.; Harrison J.; Lipschultz B.;

  • 作者单位

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

    Culham Sci Ctr Culham Ctr Fus Energy Abingdon OX14 3DB Oxon England;

    Culham Sci Ctr Culham Ctr Fus Energy Abingdon OX14 3DB Oxon England;

    Univ York York Plasma Inst Dept Phys York YO10 5DQ N Yorkshire England;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    tokamak; detachment; simulation;

    机译：Tokamak;脱离;模拟;

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