Comparison of initial value and eigenvalue codes for kinetic toroidal plasma instabilitiesUniv. of Texas, Austin, TX (United States). Institute for Fusion StudiesperKotschenreuther, M.perRewoldt, G.Princeton Univ., NJ (United States). Plasma Physics Lab.perTang, W. M.USDOE, Washington, DC (United States)orgUnited States. Department of Energy.Princeton Univ., NJ (United States). Plasma Physics Lab.New JerseyPrinceton University. Plasma Physics Laboratory.1994-04-01engIn plasma physics, linear instability calculations can be implemented either as initial value calculations or as eigenvalue calculations. Here, comparisons between comprehensive linear gyrokinetic calculations employing the ballooning formalism for high-n (toroidal mode number) toroidal instabilities are described. One code implements an initial value calculation on a grid using a Lorentz collision operator and the other implements an eigenvalue calculation with basis functions using a Krook collision operator. An electrostatic test case with artificial parameters for the toroidal drift mode destabilized by the combined effects of trapped particles and an ion temperature gradient has been carefully analyzed both in the collisionless limit and with varying collisionality. Good agreement is found. Results from applied studies using parameters from the Tokamak Fusion Test Reactor (TFTR) experiment are also compared.24 p.70 Plasma Physics And Fusion TechnologyDrift InstabilityComputerized SimulationKinetic Equations 700340Plasma Waves, Oscillations, And Instabilities