Abstract
Real-time lithium powder injection has been applied to long-pulse (>30 s) H-mode plasmas in EAST. This replenishes the active lithium surface that is routinely consumed by plasma-wall interactions. The real-time injection of Li powder into long H-mode discharges effectively suppresses impurity influx and controls recycling on EAST, with an ITER-like tungsten upper divertor. With lithium powder injection, the concentrations W, Mo, and C were reduced by 50% compared to ELMy H-mode discharges. During lithium injection, two effects play a role in the suppression of impurities influx: a reduced divertor temperature and heat flux and hence reduced erosion, and impurity trapping via deposition of a Li film onto plasma-facing surfaces. The ‘fresh’ injected lithium replenishes the film deposited during daily morning evaporation, restoring the wall's pumping capability. Thus, a measurable reduction in the global recycling coefficient was observed.
| Original language | English |
|---|---|
| Pages (from-to) | 124-130 |
| Number of pages | 7 |
| Journal | Nuclear Materials and Energy |
| Volume | 19 |
| DOIs | |
| State | Published - May 2019 |
Funding
This research was funded in part by the US Department of Energy contracts DE-AC02-09CH11466 and DE-AC05-00OR22725 , and the National Key Research and Development Program of China ( 2017YFA0402500 ), National Nature Science Foundation of China ( 11625524 , 11775261 , 11605246 , 11075185 and 11021565 ). This research was funded in part by the US Department of Energy contracts DE-AC02-09CH11466 and DE-AC05-00OR22725, and the National Key Research and Development Program of China (2017YFA0402500), National Nature Science Foundation of China (11625524, 11775261, 11605246, 11075185 and 11021565).
Keywords
- Impurity
- Lithium
- Long pulse plasma
- Recycling