Evolution of magnetic islands in a Heliac
- National Institute for Fusion Science, Furocho, Nagoya 464-01 (Japan)
- Plasma Research Laboratory and Department of Theoretical Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200 (Australia)
- Department of Applied Mathematics, University of Colorado, Boulder, Colorado 80309 (United States)
Simulations of three-dimensional equilibria in the H-1 Heliac [Fusion Technol. {bold 17}, 123 (1990)] with the HINT code [Phys. Fluids B {bold 4}, 1539 (1992)] show that the size of a dangerous magnetic island should increase with plasma pressure, but that a destruction of the equilibrium at low {beta} is avoided because the rotational transform evolves to exclude the rational surface concerned. At higher pressures there is evidence of near-resonant flux surface deformations, which may lead to an equilibrium limit. A reconnected equilibrium at still higher pressures exhibits a double island structure, which is similar to homoclinic phase portraits that have been observed after separatrix reconnection in Hamiltonian systems. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 165024
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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