Numerical simulation of ion temperature gradient driven modes in the presence of ion-ion collisions

Technical Report · Wed Aug 01 00:00:00 EDT 1990

OSTI ID:6631748

Xu, X Q ^[1]; Rosenbluth, M N ^[2]

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1. Texas Univ., Austin, TX (USA). Inst. for Fusion Studies
2. California Univ., San Diego, La Jolla, CA (USA). Dept. of Physics General Atomics Co., San Diego, CA (USA)

Ion temperature gradient driven modes in the presence of ion-ion collisions in a toroidal geometry with trapped ions have been studied by using a 1 2/2 d linearized gyro-kinetic particle simulation code in the electrostatic limit. The purpose of the investigation is to try to understand the physics of flat density discharges, in order to test the marginal stability hypothesis. Results giving threshold conditions of L{sub Ti}/R{sub 0}, an upper bound on k{sub {chi}}, and linear growth rates and mode frequencies over all wavelengths for the collisionless ion temperature gradient driven modes are obtained. The behavior of ion temperature gradient driven instabilities in the transition from slab to toroidal geometry, with trapped ions, is shown. A Monte Carlo scheme for the inclusion of ion-ion collisions, in which ions can undergo Coulomb collisional dynamical friction, velocity space diffusion and random walk of guiding centers, has been constructed. The effects of ion-ion collisions on the long wave length limit of the ion modes is discussed. 44 refs., 12 figs.

• Research Organization: Texas Univ., Austin, TX (USA). Inst. for Fusion Studies
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG05-80ET53088
• OSTI ID: 6631748
• Report Number(s): DOE/ET/53088-445; IFSR-445; ON: DE90017092; TRN: 90-029105
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
74 ATOMIC AND MOLECULAR PHYSICS
ION-ION COLLISIONS
TEMPERATURE GRADIENTS
PLASMA SIMULATION
TOKAMAK DEVICES
BOLTZMANN-VLASOV EQUATION
DISPERSION RELATIONS
DISTRIBUTION FUNCTIONS
FOKKER-PLANCK EQUATION
ION TEMPERATURE
MAGNETIC SURFACES
MHD EQUILIBRIUM
MONTE CARLO METHOD
PLASMA INSTABILITY
CLOSED PLASMA DEVICES
COLLISIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
EQUILIBRIUM
FUNCTIONS
INSTABILITY
ION COLLISIONS
MAGNETIC FIELD CONFIGURATIONS
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
THERMONUCLEAR DEVICES
700103* - Fusion Energy- Plasma Research- Kinetics
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena