Measurements of the edge current during MAST H-modes using MSE

摘要

Understanding ELMs is important for current and future fusion devices. ELMs are thought to be the.result of peeling-ballooning modes that have a stability region determined in terms of the pressure gradient ▽p and the edge current density j_Ф. Whereas several high resolution diagnostics exist to measure the pressure profile, j_Ф is usually calculated using neoclassical theory. Measurements of j_Ф would test these calculations, but are chal lenging in conventional tokamaks.