ELM and inter-ELM tungsten erosion sources in high-power, JET ITER-like wall H-mode plasmas
H. Kumpulainen, M. Groth, S. Brezinsek, G. Corrigan, L. Frassinetti, D. Harting, F. Koechl, J. Karhunen, A. Meigs, M. O’Mullane, J. Romazanov
Abstract
Simulations of JET ITER-like wall high-confinement mode plasmas, including type-I edge-localised modes (ELMs), using JINTRAC for the background plasmas and ERO2.0 for tungsten erosion and transport, predict virtually perfect screening of the primary W erosion sources at the divertor targets during both the ELM and inter-ELM phases. The largest source of W influx to the main plasma is predicted to be the outer vertical divertor due to sputtering by energetic fuel (D, T) atoms from charge-exchange reactions. ERO2.0 predictions accurately reproduce the measured W I emission in the low-field side divertor, but underpredict the W II emission by a factor of 10. Potential reasons for the W II discrepancy include uncertainties in the atomic data, assumptions on the sheath properties and the sputtering angle distribution, and the impact of metastable states.