Estimation of heat loads on the wall structures in parasitic absorption of lower hybrid power

Karin Rantamäki, Timo Pättikangas, Seppo Karttunen, P. Bibet, X. Litaudon, D. Moreau

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)


Parasitic absorption of the short wavelength modes of the LH spectrum is a probable reason for the hot spots seen in the grill region of several tokamaks. Experiments suggest that the heat loads on the wall structures depend on the coupled power. In this work, the parasitic absorption of LH power was studied with self-consistent particle-in-cell simulations. The launched spectra were obtained from the SWAN coupling code. The power and temperature dependences of the absorption in the near field of the LH grill were investigated with a series of simulations. The parasitic absorption was found to grow from 0.6 to 1.1% when the coupled power increased from 26 to 67 MW/m2. When the edge temperature rose from 12.5 to 100 eV, the absorption increased from 0.4 to 1.7%. The maximum kinetic energies were between 0.6 and 1.8 keV. Estimates for the heat loads and surface temperature of the grill limiter are also obtained. The absorption leads to heat loads between 1.5 and 13 MW/m2 and surface temperatures of 510-2390° C.

Original languageEnglish
Pages (from-to)1477 - 1490
Number of pages14
JournalNuclear Fusion
Issue number8
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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