Kinetic ballooning modes at the tokamak transport barrier with negative magnetic shear

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872523· OSTI ID:544859

Yamagiwa, M ^[1]; Hirose, A; Elia, M ^[2]

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1. Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, 801-01 Mukoyama, Naka, Ibaraki 311-01 (Japan)
2. Plasma Physics Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan S7N5E2 (Canada)

Stability of the kinetic ballooning modes is investigated for plasma parameters at the internal transport barrier in tokamak discharges with negative magnetic shear employing a kinetic shooting code with long shooting distance. It is found that the second stability regime with respect to the pressure gradient parameter, which was predicted for negative shear [A. Hirose and M. Elia, Phys. Rev. Lett. {bold 76}, 628 (1996)], can possibly disappear. The mode with comparatively low toroidal mode number and mode frequency below 100 kHz is found to be destabilized marginally only around the transport barrier characterized by steep pressure and density gradients. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 544859
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BALLOONING INSTABILITY
CHARGED-PARTICLE TRANSPORT
ELECTRIC DISCHARGES
PLASMA DENSITY
PLASMA PRESSURE
SHEAR
TOKAMAK DEVICES