Behavior of lower hybrid waves in the scrape off layer of a diverted tokamak

[摘要] (cont.) Bremsstrahlung emission and relativistic electron cyclotron emission from fast electrons in the core plasma drop suddenly above line averaged densities of 10 20 m -3 , well below the previously observed density limit. These experimental data are compared to both conventional modeling, which gives poor agreement with experiment above the density limit, and a model including edge collisional absorption, which dramatically improves agreement with experiment above the density limit. Combined together, these results show that strong absorption of LH waves in the SOL is possible on a high density tokamak. The paradigm of computationally treating the plasma core and edge as two separate regions with no or weak interaction fails when compared with the C-Mod results. These observations have spurred a shift towards simulating the core and SOL plasma together in predictive simulations of LHCD.

[发布机构] Massachusetts Institute of Technology