DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
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Title	84: Influence of resonant/non-resonant magnetic perturbation on particle confinement with n=2
Name:	Marcin Jakubowski marcin.jakubowski@ipp.mpg.de	Affiliation:	Max-Planck Institute for Plasma Physics
Research Area:	ELM Control	Presentation time:	Requested
Co-Author(s):	Todd Evans, Andrew Kirk, YoungMu Jeon, Wolfgang Suttrop	ITPA Joint Experiment :	Yes
Description:	Aim of the experiment is to understand what type of interaction between magnetic perturbation and the plasma equilibrium leads to the enhanced particle transport and thus so-called pump-out. This is part of the broader inter-machine comparison with ASDEX-Upgrade, KSTAR and MAST and supports high priority ITPA activities defined as the goals for 2013 within PEP-23 and TC-24 joint experiments.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Start with a standard LSN (ITER-like) shape with n= 2 RMP mitigation (q95 ~ 3.35, double I-coil row) and vary the pitch of the magnetic perturbation by changing the phase of top I-coils while keeping bottom coils fixed (6 steps). At each step perform an additional discharge with n=2 and q95 at the edge of the resonant window (q95 ~ 3.2).
Background:	According to the present understanding RMPs reduce pressure gradients in the pedestal region by introducing a stochastic boundary allowing suppressing or mitigating ELMs while keeping the outward impurity transport enhanced. On DIII-D (in contrast to ASDEX-Upgrade) the pump-out is almost immanently associated with the ELM suppression or mitigation by external field. Also on DIII-D the pump-out window is much wider as compared to the ELM suppression window, which indicates that pump-out could be an effect of non-resonant field interacting with plasma. However, the results from MAST suggest that only pitch resonant coupling of magnetic perturbation with plasma results in enhanced particle transport.
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