The Impact of Resonant Magnetic Perturbation Strength on the L-H Power Threshold
Abstract
We report a DIII-D database study of H-mode power threshold in the presence of Resonant Magnetic Perturbations (RMPs) compared to the Martin L-H power scaling. Since ELM control is critical for ITER, this study is important for assessing the impact of RMP ELM suppression on the L-H power over a range of DIII-D plasma conditions, which can eventually be projected to ITER. The L-H transition is a complex phenomenon with several key control parameters, some of which are altered by the RMP field. In order to understand the effects of RMPs on the L-H threshold, a scaling model is being constructed that includes the amplitude and phase of various 3D toroidal modes due to field-error correction and RMP coils in DIII-D. In addition to the loss power used in the Martin scaling (PL = Pohm + Pabs - dW/dt - Pf-loss) we include the radiated power loss from the core, which has a significant impact of the scaling in DIII-D and is expected to be important in ITER. Preliminary results indicate a systematically higher power needed to cross into H-mode when RMPs are present when compared to the Martin scaling.
Work supported in part by US Department of Energy under the SULI program and under DE-FC02-04ER54698, DE-SC0018030, DE-AC02-09CH11466, and FG02-05ER54809.- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DPPJ13034H