On the Challenge of Plasma Heating with the JET Metallic Wall
Abstract
The major aspects linked to the use of the JET auxiliary heating systems: NBI, ICRF and LHCD, in the new JET ITER-like wall (JET-ILW) are presented. We show that although there were issues related to the operation of each system, efficient and safe plasma heating was obtained with room for higher power. For the NBI up to 25.7MW was safely injected; issues that had to be tackled were mainly the beam shine-through and beam re-ionisation before its entrance into the plasma. For the ICRF system, 5MW were coupled in L-mode and 4MW in H-mode; the main areas of concern were RF-sheaths related heat loads and impurities production. For the LH, 2.5 MW were delivered without problems; arcing and generation of fast electron beams in front of the launcher that can lead to high heat loads were the keys issues. For each system, an overview will be given of: the main modifications implemented for safe use, their compatibility with the new metallic wall, the differences in behavior compared with the previous carbon wall, with emphasis on heat loads and impurity content in the plasma.
Keywords
Cite
@article{arxiv.1309.0948,
title = {On the Challenge of Plasma Heating with the JET Metallic Wall},
author = {M-L Mayoral and V Bobkov and A Czarnecka and I Day and A Ekedah and P Jacquet and M Goniche and R King and K Kirov and E Lerche and J Mailloux and D Van Eester and O Asunta and C Challis and D Ciric and J W Coenen and L Colas and C Giroud and M Graham and I Jenkins and E Joffrin and T Jones and D King and V Kiptily and C C Klepper and C Maggi and R. Maggiora and F Marcotte and G Matthews and D Milanesio and I Monakhov and M Nightingale and R Neu and J Ongena and T Pütterich and V Riccardo and F Rimini and J Strachan and E Surrey and V Thompson and G Van Rooij and JET EFDA contributors},
journal= {arXiv preprint arXiv:1309.0948},
year = {2014}
}
Comments
21 pages, 17 figures