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Title: The effect of pre-existing islands on disruption mitigation in MHD simulations of DIII-D

Locked-modes are the most likely cause of disruptions in ITER, so large islands are expected to be common when the ITER disruption mitigation system is deployed. MHD modeling of disruption mitigation by massive gas injection is carried out for DIII-D plasmas with stationary, pre-existing islands. Results show that the magnetic topology at the q=2 surface can affect the parallel spreading of injected impurities, and that, in particular, the break-up of large 2/1 islands into smaller 4/2 islands chains can favorably affect mitigation metrics. The direct imposition of a 4/2 mode is found to have similar results to the case in which the 4/2 harmonic grows spontaneously.
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  1. Univ. of California, San Diego, CA (United States). Center for Energy Research
Publication Date:
Grant/Contract Number:
FC02-04ER54698; FG02-95ER54309; FC02-01ER25455; AC02-05CH11231
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
American Institute of Physics (AIP)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Large islands; Magnetic islands; Toroidal plasma confinement; Plasma impurities; Fluid jets
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1348025