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

Technical Report · Wed May 01 04:00:00 EDT 1991

OSTI ID:5660692

Zhang, Y Z; Mahajan, S M

Possible destabilizing mechanisms for the liner 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. It 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, both the charge exchange of the rippling effect are found to be unimportant for instability. 25 refs., 6 figs.

• Research Organization: Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-80ET53088; FG05-88ER53266
• OSTI ID: 5660692
• Report Number(s): DOE/ET/53088-500; IFSR--500; ON: DE91015907
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ANALYTICAL SOLUTION
BOUNDARY LAYERS
CHARGE EXCHANGE
CHARGED-PARTICLE TRANSPORT
CLOSED PLASMA DEVICES
CONTINUITY EQUATIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
EQUATIONS OF MOTION
IMPURITIES
INSTABILITY
IONIZATION
LAYERS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA DRIFT
PLASMA IMPURITIES
PLASMA INSTABILITY
PLASMA SCRAPE-OFF LAYER
PLASMA WAVES
RADIATION TRANSPORT
TEXT DEVICES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE