Impurity and neutral effects on the dissipative drift wave in tokamak edge plasmas

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860435· OSTI ID:5588781

Zhang, Y Z; Mahajan, S M ^[1]

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1. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)

Possible destabilizing mechanisms for the linear electrostatic dissipative drift waves (in tokamak edge plasmas) are investigated in slab geometry. The effects of processes such as ionization, charge exchange, radiation, and rippling are examined. In particular, the impurity condensation associated with radiation cooling is evaluated appropriately for the drift wave ordering, which is found to be an important driving mechanism in contrast to the results of earlier studies (R. J. Thayer and P. H. Diamond, Phys. Rev. Lett. {bold 65}, 2784 (1990)). It is also shown that the role of ionization is quite complicated, and depends strongly on the manner in which the equilibrium is achieved. The linear eigenmode equation is studied both analytically and numerically. For the range of parameters relevant to TEXT tokamak (K. W. Gentle, Nucl. Fusion Technol. {bold 1}, 479 (1981)), both the charge exchange and the rippling effect are found to be unimportant for instability.

• DOE Contract Number: FG05-80ET53088; FG05-88ER53266
• OSTI ID: 5588781
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:1; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
CHARGE EXCHANGE
CLOSED PLASMA DEVICES
COLLISIONAL PLASMA
CONFINEMENT
COOLING
DRIFT INSTABILITY
FLUCTUATIONS
IMPURITIES
INSTABILITY
IONIZATION
LARMOR RADIUS
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
RADIATIVE COOLING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE
VARIATIONS