Comparison of radiating divertor behaviour in single-null and double-null plasmas in DIII-D
Comparison of radiating divertor behaviour in single-null and double-null plasmas in DIII-D
复制标题
DOI：
10.1088/0029-5515/48/4/045010
复制
发表时间：
2008-03
期刊：
影响因子：
3.3
通讯作者：
T. Petrie;N. Brooks;M. Fenstermacher;M. Groth;A. Hyatt;R. Isler;C. Lasnier;A. Leonard;G. Porter;M. Schaffer;J. Watkins;M. Wade;W. West
中科院分区：
文献类型：
--
作者：
T. Petrie;N. Brooks;M. Fenstermacher;M. Groth;A. Hyatt;R. Isler;C. Lasnier;A. Leonard;G. Porter;M. Schaffer;J. Watkins;M. Wade;W. West
“抽吸和泵送”辐射偏滤器方案应用于上单零（SN）和双零（DN）H模等离子体，导致辐射功率增加30-60%，τE几乎没有或没有降低。氩气被注入到私人通量区的上偏滤器，并进入上偏滤器的等离子体流增强的组合的氘气喷上游的偏滤器目标和粒子泵在目标。在相同的氘注入速率下，当B × 10 B离子漂移方向朝向偏滤器（V B↑）而不是远离偏滤器（V B ↓）时，氩更快地穿透SN的主等离子体，并达到更高的稳态浓度。我们还发现，在DN等离子体中积累氩的初始速率是具有相同B × N-B离子漂移方向的可比SN等离子体的两倍以上。在DN中，在氩注入期间，偏滤器之间的辐射功率并不相等。只有当B × B B离子漂移方向远离偏滤器时，偏滤器辐射功率才显著增加，并且根据Ar II的光谱测量观察到偏滤器中氩的积累。我们的数据表明，一个不平衡的DN形状，其中B × 10 B离子漂移的方向远离主导偏滤器，可能提供最好的机会，成功耦合辐射偏滤器的方法与更高性能的H模式等离子体。
‘Puff-and-pump’ radiating divertor scenarios, applied to both upper single-null (SN) and double-null (DN) H-mode plasmas, result in a 30–60% increase in radiated power with little or no decrease in τE. Argon was injected into the private flux region of the upper divertor, and plasma flow into the upper divertor was enhanced by a combination of deuterium gas puffing upstream of the divertor targets and particle pumping at the targets. For the same constant deuterium injection rate, argon penetrated the main plasma of SNs more rapidly and reached a higher steady-state concentration when the B × ∇B-ion drift direction was towards the divertor (V∇B↑) rather than away from the divertor (V∇B↓). We also found that the initial rate at which argon accumulated inside DN plasmas was more than twice that of comparable SN plasmas having the same B × ∇B-ion drift direction. In DNs, the radiated power was not shared equally between divertors during argon injection. Only when the B × ∇B ion drift direction was away from the divertor were both significant increases in divertor radiated power and an accumulation of argon in the divertor observed, based on spectroscopic measurements of Ar II. Our data suggest that an unbalanced DN shape where the B × ∇B-ion drift is directed away from the dominant divertor may provide the best chance of successfully coupling a radiating divertor approach with a higher performance H-mode plasma.