Numerical study of linear dissipative drift electrostatic modes in tokamaks

Journal Article · Wed Aug 15 04:00:00 EDT 2007 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2755981· OSTI ID:21072624

Romanelli, M; Regnoli, G; Bourdelle, C ^[1]

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1. Euratom/UKAEA Fusion Association, Culham Science Centre, OXON, OX14 3DB (United Kingdom)

The linear stability of dissipative drift electrostatic modes in tokamak plasmas is studied numerically with an extended version of the gyrokinetic code Kinezero [C. Bourdelle et al., Nucl. Fusion 42, 892 (2002)] including a modified Krook collision operator to account for collisional effects on the trapped electron response. This new version of Kinezero has been successfully tested and benchmarked against the results of a more sophisticated and complete gyrokinetic solver, GS2 [M. Romanelli, C. Bourdelle, and W. Dorland, Phys. Plasmas 11, 3845 (2004)]. The critical density and temperature gradients for ion gradient driven modes (ITG) and trapped electron modes (TEM) have been computed for different values of collisionality. The threshold for TEM disappears as the collisionality increases. A detailed study of the dependence of the growth rate of the dissipative TEM on collisionality and density gradient is presented in the paper. The range of parameters where the dissipative trapped electron modes are destabilized by increasing collisionality corresponds to very steep density gradients that can hardly be achieved in today's large tokamaks.

• OSTI ID: 21072624
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DRIFT INSTABILITY
ELECTRON TEMPERATURE
ION TEMPERATURE
IONS
NUMERICAL ANALYSIS
PLASMA
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DRIFT
PLASMA SIMULATION
PLASMA WAVES
STABILITY
TEMPERATURE GRADIENTS
TOKAMAK DEVICES
TRANSMISSION ELECTRON MICROSCOPY
TRAPPED ELECTRONS