Speaker
Mr
Pavel Minashin
(NRC "Kurchatov Institute")
Description
A model is suggested for calculating the efficiency of multi-pass absorption of EC heating wave in tokamaks at initial stage of discharge, and the effect on the start-up in ITER-like tokamak is analyzed. The single-pass absorption of injected EC wave is evaluated with the scaling obtained using the OGRAY code. The model for subsequent multi-pass absorption, after first reflection of the EC wave from the wall of vacuum chamber, assumes isotropy/uniformity of the respective EC radiation intensity in plasma. The model modifies the CYNEQ code approach developed for the plasma-produced EC radiation transport at high EC harmonics and verified in the benchmarking with other codes. We consider the following case: (a) multiple reflection of injected EC wave (O-mode) from the wall; (b) polarization scrambling in wall reflections; (c) full single-pass absorption of the X-mode. Our parametric analysis for typical electron temperature and density at initial stage of discharge in ITER-like tokamak shows strong dependence of multi-pass absorption efficiency on the O-X conversion in wall reflections. The multi-pass absorption model is incorporated in the 1-D simulations of plasma start-up with the DINA code that enables us to extend the results of previous simulations with the single-pass absorption model.
| Country or International Organisation | Russian Federation |
|---|---|
| Paper Number | TH/P3-32 |
Primary author
Mr
Pavel Minashin
(NRC "Kurchatov Institute")
Co-authors
Dr
Alexander B. Kukushkin
(NRC Kurchatov Institute)
Dr
Rustam Khayrutdinov
(Troitsk Institute for Innovation & Fusion Research)
Dr
Victor Lukash
(NRC "Kurchatov Institute")
