Multi-region relaxed magnetohydrodynamics in plasmas with slowly changing boundaries -- Resonant response of a plasma slab
- Australian National Univ., Canberra, ACT (Australia)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of Tokyo (Japan)
The adiabatic limit of a recently proposed dynamical extension of Taylor relaxation, multi-region relaxed magnetohydrodynamics (MRxMHD), is summarized, with special attention to the appropriate definition of a relative magnetic helicity. The formalism is illustrated using a simple two-region, sheared-magnetic-field model similar to the Hahm-Kulsrud-Taylor (HKT) rippled-boundary slab model. In MRxMHD, a linear Grad-Shafranov equation applies, even at finite ripple amplitude. The adiabatic switching on of boundary ripple excites a shielding current sheet opposing reconnection at a resonant surface. The perturbed magnetic field as a function of ripple amplitude is calculated by invoking the conservation of magnetic helicity in the two regions separated by the current sheet. Here, at low ripple amplitude, "half islands" appear on each side of the current sheet, locking the rotational transform at the resonant value. Beyond a critical amplitude, these islands disappear and the rotational transform develops a discontinuity across the current sheet. Published by AIP Publishing.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Contributing Organization:
- Centre for Plasmas and Fluids, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia; Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561, Japan; R.L.D. some travel support from Australian Research Council Grant No. DP11010288. The work of S.R.H. and A.B. was supported under U.S. DOE Grant No. DE-AC02-09CH11466 and that of Z.Y. was supported under JSPS Grant No. KAKENHI 23224014.
- Grant/Contract Number:
- AC02-09CH11466
- OSTI ID:
- 1358665
- Alternate ID(s):
- OSTI ID: 1361799
- Report Number(s):
- PPPL-5373; Australian Research Council Grant No. DP11010288; JSPS Grant No. KAKENHI 23224014.
- Journal Information:
- Physics of Plasmas, Vol. 24, Issue 4; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Summary of the fundamental plasma physics session in the first AAPPS-DPP conference
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journal | May 2019 |
Fast magnetic reconnection and the ideal evolution of a magnetic field
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journal | April 2019 |
Fast magnetic reconnection and the ideal evolution of a magnetic field | text | January 2018 |
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