A Kinetic Code System to Study Impurity Deposition and Fuel Retention in Gaps Between Divertor Tiles

作者：Dai, S.; Sang, C.; Sun, J.; Wang, D.^*

来源：Contributions to Plasma Physics, 2012, 52(4): 309-316.

DOI：10.1002/ctpp.201100025

• Monte Carlo methods
• particle-in-cell method
• divertor
• graphite

For the purpose of investigating impurity deposition and fuel retention in gaps between divertor tiles, we combine a three-dimensional Monte Carlo impurity transport code ITCD with a Particle-In-Cell Monte Carlo collision code plus a plasma-surface interaction (PSI) code. The simulation results show that a potential hill formed near the entrance of the gap can prevent the ionized eroded carbon species from entering the gap. It is found that carbon sources for the co-deposition in gaps are mainly located at the plasma-closest edges of the gap, and this finding indicates that special measures associated with the engineering issues should be taken to minimize fuel retention in gaps. The smaller scale of carbon sources inside the gap and the existence of the potential hill near the entrance of the gap are the reasons why the eroded carbon species spatial density is lower inside the gap than outside the gap. Through the study on several scenarios with different substrate and plasma temperatures, the simulation with the combined code can deepen the understanding of fuel retention in the codeposited layers in gaps.

• 出版日期2012-5
• 单位大连理工大学