Characterisation of local ICRF heat loads on the JET ILW
Abstract
When using Ion Cyclotron Range of Frequency (ICRF) heating, enhanced heat-fluxes are commonly observed on some plasma facing components close to the antennas. Experiments have recently been carried out on JET with the new ITER-Like-Wall (ILW) to characterize the heat flux to the JET ICRF antennas. Using Infra-Red thermography and thermal models of the tiles, heat-fluxes were evaluated from the surface temperature increase during the RF phase of L-mode plasmas. The maximum observed heat-flux intensity was ~ 4.5 MW/m2 when operating with -{\pi}/2 current drive strap phasing at power level of 2MW per antenna and with a 4 cm distance between the plasma and the outer limiters. Heat-fluxes are reduced when using dipole strap phasing. The fraction of ICRF power deposited on the antenna limiters or septa was in the range 2-10% for dipole phasing and 10-20% with +/-{\pi}/2 phasing.
Keywords
Cite
@article{arxiv.1306.6778,
title = {Characterisation of local ICRF heat loads on the JET ILW},
author = {P. Jacquet and F. Marcotte and L. Colas and G. Arnoux and V. Bobkov and Y. Corre and S. Devaux and J-L Gardarein and E. Gauthier and M. Graham and E. Lerche and M-L. Mayoral and I. Monakhov and F. Rimini and A. Sirinelli and D. Van Eester and JET EFDA contributors},
journal= {arXiv preprint arXiv:1306.6778},
year = {2013}
}
Comments
22 pages, 6 figures