Analysis of C-MOD molybdenum divertor erosion and code/data comparison

作者：Brooks J N^*; Allain J P; Whyte D G; Ochoukov R; Lipschultz B

来源：Journal of Nuclear Materials, 2011, 415(1): S112-S116.

DOI：10.1016/j.jnucmat.2010.08.061

We analyze an important 15 year old Alcator C-MOD study of campaign-integrated molybdenum divertor erosion in which the measured net erosion was significantly higher (similar to X3) than originally predicted by a simple model [1,2]. We perform full process sputtering erosion/redeposition computational analysis including the effect of a possible RF induced sheath. The simulations show that most sputtered Mo atoms are ionized close to the surface and strongly redeposited, via Lorentz force motion and collisional friction with the high density incoming plasma. The predicted gross erosion profile is a reasonable match to Mol influx data, however, the critically important net erosion comparison with post-exposure Mo tile analysis is poor, with similar to X10 higher peak erosion measured than computed. An RF sheath increases predicted erosion by similar to 45%, thus being significant but not fundamental. We plan future analysis.

• 出版日期2011-8-1