DIVIMP tungsten erosion and transport simulations of an ELM cycle in a JET type-I ELMy H-mode plasma

摘要

Tungsten target erosion and transport has been simulated using the kinetic trace impurity code DIVIMP for a baseline type-I ELMy H-mode plasma in JET (JPN #73569, I_P=2.2MA, B_t=2.2T, 8 = 0.2, P_(nbi)=13MW, n=0.75n_(Gw)). DIVIMP calculations are performed on 2D background plasmas, dynamically evolved in time using the integrated' code suite JINTRAC [1]. Tungsten sputtering due to deuterium, arid small percentages of beryllium and neon are included. It is observed that tungsten source is dominated by physical sputtering due to deuterium at the ELM peak. In the simulation the ELM period leads to a burst of' sputtering followed by a period of high divertor leakage, thus, effectively fuelling core' plasma with tungsten. Thus, already wimout self-sputtering, an' average tungsten core concentration approximately 0.8*10~(-5) is calculated including self-sputtering leads to a tungsten run-away process at the ELM peak significantly increasing the tungsten source prior and during the high-leakage period and subsequendy leading to a more pessimistic estimate of tungsten core contamination.