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首页> 外文期刊>Physics of plasmas >Impact of magnetic islands in the plasma edge on particle fueling and exhaust in the HSX and W7-X stellarators
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Impact of magnetic islands in the plasma edge on particle fueling and exhaust in the HSX and W7-X stellarators

机译：磁岛在粒子燃料和W7-X螺旋液中粒子边缘磁场的影响

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摘要

The edge magnetic structure in the Helically Symmetric eXperiment (HSX) and Wendelstein 7X (W7-X) stellarators has been shown to have a significant impact on the particle fueling and exhaust of the plasma main species (hydrogen) as well as impurity helium. For HSX, the plasma sourcing to exhaust ratio, quantified by the effective and global particle confinement times tau*(p) and tau(p,H), respectively, increases when a magnetic island chain is located in the plasma edge. The fueling efficiency is reduced by 25% when the plasma boundary is deformed by the magnetic islands. The X-point geometry also yields higher plasma temperatures in front of the main recycling region. When the island is moved radially inward, both tau*(p) and tau(p) decrease by 10%-25% depending on plasma density. The tau(p,H) results rely heavily on EMC3-EIRENE modeling which confirms reduced fueling efficiency due to more rapid ionization in the outward shifted island position. These findings suggest that for a helically optimized system like HSX, the plasma fueling from the recycling source, as well as from active gas injection, can be controlled by the magnetic island chain in the plasma edge-which is a basic requirement for a divertor system. This process is also effective for the control of effective helium exhaust times, as tau*(p,He) measured by perturbative gas puff experiments is reduced by up to 40% when the islands are shifted inwards. For Wendelstein 7-X, a similar reduction of tau*(p,He) was inferred when magnetic islands were moved from the far plasma edge into the confined plasma region. However, the effective confinement features of H as the main plasma species were not affected due to the non-optimal position of the magnetic islands with respect to the highly localized ionization domain during the limiter startup campaign. Published by AIP Publishing.
机译：已经显示出螺旋对称实验（HSX）和Wendelstein 7X（W7-X）螺旋制术中的边缘磁性结构对等离子体主物种（氢）以及杂质氦的颗粒燃料和排气产生显着影响。对于HSX，分别通过有效和全球粒子限制时间Tau *（P）和Tau（P，H）量化的血浆采购以磁岛链位于等离子体边缘中时增加。当磁岛变形等离子体边界时，燃料效率降低了25％。 X点几何形状还在主回收区域前面产生更高的等离子体温度。当岛径向向内移动时，TAU *（P）和TAU（P）根据等离子体密度降低10％-25％。 TAU（P，H）的结果依赖于EMC3-烯烯建模，这证实了由于向外移位岛位置的更快电离而降低了燃料效率。这些发现表明，对于HSX等螺旋优化的系统，可以由等离子体边缘中的磁岛链控制从回收源以及活性气体喷射的等离子体来控制 - 这是转型系统的基本要求。该过程对控制有效氦气排气时也是有效的，因为当岛向内移动时，通过扰动气体泡芙实验测量的TAU *（P，HE）减少了高达40％。对于Wendelstein 7-X，当从远离等离子体边缘移动到狭窄的等离子体区域时，推断Tau *（P，He）的类似减少。然而，由于磁岛在限制器启动运动期间高度局部电离结构域的非最佳位置，H作为主等离子体物种的有效限制特征不会受到影响。通过AIP发布发布。

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