Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Physics of Plasmas
2 (1995), S. 3764-3768
ISSN:
1089-7674
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Analytical and numerical study of the stability of the resistive ballooning modes (RBM) in the scrape-off layer (SOL) of a tokamak plasma is performed. It is shown that the stability of the RBM is controlled by the two parameters λ=(me/mi)1/2νeiqR/vTe—the "effective strength'' of the Debye sheath current, and mˆ=mL0/a the dimensionless poloidal number, where the characteristic scale L0 is given in the main text as a function of the basic plasma edge parameters. For λ(approximately-greater-than)1 the coupling to the sheath is unimportant and the unstable spectrum is virtually unchanged from that in the closed flux region. For λ〈1 the sheath current has a strong destabilizing influence on long wavelength modes. The general case of arbitrary λ and mˆ is studied numerically and the spectrum of the unstable RBM is found. The influence of the diamagnetic effects is also investigated. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.871075
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