ICRF current drive experiment on JIPP T-IIU
Authors:
- 1 December 1986
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 26 (12) , 1619-1624
Abstract
In the JIPP T-IIU tokamak an experiment to demonstrate the feasibility of fast wave current drive using five loop antennas has been successfully carried out with a relatively high density plasma (ωpe2/ωce2~5). The RF frequency is 40 MHz and the toroidal field is 2 kG, which corresponds to ω = 13ωcH. The experiment is conducted in the density range e ~ 2 × 1018 m−3 where only the fast wave can propagate, eliminating the possibility of slow wave current drive. This density is two orders of magnitude higher than the density limit predicted for slow wave current drive. The dependence of the drive efficiency on the relative phase difference Δ is clearly observed with a maximum of about Δ = π/4. The plasma current was limited by MHD instability which begins to occur around qa = 10.Keywords
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