Abstract : In 2018, Ion Cyclotron Resonant Frequency (ICRF) waves were for the first time applied to the WEST plasma
scenarios. In ICRF-only plasmas at medium density, or on top of a low level of Lower Hybrid (LH) power, the coupled
ICRF power increases the plasma energy content. However in discharges with large LH power at high core density, nearly
all the applied ICRF power gets radiated, mainly in the plasma bulk. Both the energy content and conducted power decrease.
Two peculiarities of WEST, that may combine, are presently invoked to explain this phenomenology:1) Fast ion ripple
losses, evidenced between TF coils on the baffle, likely degrade the ICRF heating efficiency. 2) RF-enhanced W sources,
evidenced on several Plasma-Facing Components (PFCs), likely over-contaminate the high-power plasmas.
https://hal-cea.archives-ouvertes.fr/cea-02477474
Contributor : Valerie Icard
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L. Colas, G. Urbanczyk, M. Goniche, E. Lerche, J. Hillairet, et al.. First Application of Ion Cyclotron Resonant Frequency Waves on WEST Plasma Scenarios. 23rd Topical Conference on Radiofrequency Power in Plasmas (RFPPC), May 2019, HEFEI, China. ⟨cea-02477474⟩
