Influence of the low order rational q surfaces on the pellet deposition profile
Influence of the low order rational q surfaces on the pellet deposition profile
复制标题
低阶有理 q 表面对颗粒沉积剖面的影响
DOI：
10.1088/0029-5515/50/2/025011
复制
发表时间：
2010
期刊：
影响因子：
3.3
通讯作者：
H. Nehme
中科院分区：
文献类型：
--
作者：
N. Commaux;B. Pégourié;L. Baylor;F. Köchl;P. Parks;T. Jernigan;A. Géraud;H. Nehme
按计划，弹丸注入将是ITER的主要燃料注入方法。聚变燃烧期间等离子体的高温将限制弹丸的穿透到小半径的外三分之一。这种有限的穿透预计将通过极化漂移来补偿，对于从高场侧注入的颗粒，极化漂移将使颗粒在等离子体中更深地沉积存款。为了评估ITER的预期加料深度，很好地理解这种漂移效应是很重要的。在美国DIII-D和法国Tore Supra托卡马克上获得的实验数据表明，低阶有理q面对极化漂移有影响。当漂移粒子穿过这些表面时，这些表面似乎减弱了极化机制。在本文中，小球质量沉积曲线的最大值和DIII-D和Tore Supra上的q = 2和q = 3表面的位置之间的相关性示出为高场侧和低场侧注入。提出了一个模型来解释这种效应，并与实验结果进行了比较。最后，在ITER的燃料的这种现象的可能后果进行了描述。
Pellet injection is planned to be the main fuelling method on ITER. The high temperature of the plasma during a fusion burn will limit the penetration of the pellet to the outer third of the minor radius. This limited penetration is expected to be compensated by a polarization drift, which will deposit the particles deeper in the plasma for the pellets injected from the high field side. In order to evaluate the expected depth of the fuelling on ITER, a good understanding of this drift effect is important. Experimental data acquired on the DIII-D (USA) and Tore Supra (France) tokamaks show that the polarization drift is influenced by the low order rational q surfaces. These surfaces appear to attenuate the polarization mechanism as the drifting particles cross them. In this paper, a correlation between the maximum of the pellet mass deposition profile and the positions of the q = 2 and q = 3 surfaces on DIII-D and Tore Supra is shown for high field side and low field side injection. A model is proposed to explain this effect and compared with the experimental results. To conclude, the possible consequences of this phenomenon on the fuelling in ITER are described.