Journal
NUCLEAR FUSION
Volume 54, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0029-5515/54/7/073013
Keywords
error field correction; plasma response; resistive wall mode; kink mode; tokamak
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Funding
- US Department of Energy [DE-AC05-06OR23100, DE-FC02-04ER54698, DE-FG02-04ER54761, DE-AC02-09CH11466]
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Experimental optimum error field correction (EFC) currents found in a wide breadth of dedicated experiments on DIII-D are shown to be consistent with the currents required to null the poloidal harmonics of the vacuum field which drive the kink mode near the plasma edge. This allows the identification of empirical metrics which predict optimal EFC currents with accuracy comparable to that of first-principles modelling which includes the ideal plasma response. While further metric refinements are desirable, this work suggests optimal EFC currents can be effectively fed-forward based purely on knowledge of the vacuum error field and basic equilibrium properties which are routinely calculated in real-time.
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