Runaway electron behaviour with the ITER-like wall in JET

G. Papp, T. F̈ul̈op, T. Feh́er, P. C. De Vries, V. Riccardo, C. Reux, M. Lehnen, V. Kiptily, V. V. Pluysnin, B. Alper

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Our simulation results show that the differences between the CFC wall and ILW cases are due to the positive feedback effect between (1) the different plasma parameter profiles due to the different wall, (2) the difference in the injected/mixed argon amount, and (3) the different radiation characteristics of beryllium and carbon. Variations in the argon content in these simulations have a considerable effect on the runaway generation. The Dreicer fraction is reduced by the presence of beryllium, but is almost unaffected by the presence of carbon. This results in a lower Dreicer current generation in the ILW case compared with the CFC wall case. The runaway population in the ILW case consists mostly of slowly growing avalanche runaways and they are effectively transported out from the plasma by a low level of magnetic perturbations or other losses. Note, that the presence of beryllium is beneficial only if the amount of argon is not too large. Above~ 50% argon content the radiation of the argon takes over and the differences due to the wall material eventually vanish. In view of the results of this paper, upcoming massive gas injection experiments with the ILW on JET will most probably have to face with the reoccurance of runaways for the scenarios that produced runaways using MGI with the carbon wall. Dedicated runaway experiments with the ILW on JET are necessary to be able to better estimate the runaway behaviour in ITER.

Original languageEnglish
Title of host publication40th EPS Conference on Plasma Physics, EPS 2013
PublisherEuropean Physical Society (EPS)
Pages165-168
Number of pages4
ISBN (Print)9781632663108
Publication statusPublished - Jan 1 2013
Event40th EPS Conference on Plasma Physics, EPS 2013 - Espoo, Finland
Duration: Jul 1 2013Jul 5 2013

Publication series

Name40th EPS Conference on Plasma Physics, EPS 2013
Volume1

Other

Other40th EPS Conference on Plasma Physics, EPS 2013
CountryFinland
CityEspoo
Period7/1/137/5/13

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Papp, G., F̈ul̈op, T., Feh́er, T., De Vries, P. C., Riccardo, V., Reux, C., Lehnen, M., Kiptily, V., Pluysnin, V. V., & Alper, B. (2013). Runaway electron behaviour with the ITER-like wall in JET. In 40th EPS Conference on Plasma Physics, EPS 2013 (pp. 165-168). (40th EPS Conference on Plasma Physics, EPS 2013; Vol. 1). European Physical Society (EPS).