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Title: Ideal plasma response to vacuum magnetic fields with resonant magnetic perturbations in non-axisymmetric tokamaks

Ideal plasma shielding and amplification of resonant magnetic perturbations in non-axisymmetric tokamak is presented by field line tracing simulation with full ideal plasma response, compared to measurements of divertor lobe structures. Magnetic field line tracing simulations in NSTX with toroidal non-axisymmetry indicate the ideal plasma response can significantly shield/amplify and phase shift the vacuum resonant magnetic perturbations. Ideal plasma shielding for n = 3 mode is found to prevent magnetic islands from opening as consistently shown in the field line connection length profile and magnetic footprints on the divertor target. It is also found that the ideal plasma shielding modifies the degree of stochasticity but does not change the overall helical lobe structures of the vacuum field for n = 3. Furthermore, amplification of vacuum fields by the ideal plasma response is predicted for low toroidal mode n = 1, better reproducing measurements of strong striation of the field lines on the divertor plate in NSTX.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Korea Advanced Institute of Science and Technology, Daejeon (Korea)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Report Number(s):
PPPL-5155; LLNL-JRNL-666904
Journal ID: ISSN 0741-3335
Grant/Contract Number:
AC02-09CH11466; AC52-07NA27344; NRF-2014M1A7A1A03045092
Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 10; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; National Research Foundation of Korea (NRF)
Contributing Orgs:
Research funded by The National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2014M1A7A1A03045092) | U.S. Department of Energy (DE-AC02-09CH11466, DE-AC52-07NA27344)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetic fields effects; Monte Carlo methods; tokamaks; NSTX; 70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1255637
Alternate Identifier(s):
OSTI ID: 1238812; OSTI ID: 1305816