Gyrokinetic-water-bag modeling of low-frequency instabilities in a laboratory magnetized plasma column

Gravier, E.; Klein, R.; Morel, P.; Besse, N.; Bertrand, P.
December 2008
Physics of Plasmas;Dec2008, Vol. 15 Issue 12, p122103
Academic Journal
A new model is presented, named collisional-gyro-water-bag (CGWB), which describes the collisional drift waves and ion-temperature-gradient (ITG) instabilities in a plasma column. This model is based on the kinetic gyro-water-bag approach recently developed [P. Morel et al., Phys. Plasmas 14, 112109 (2007)] to investigate ion-temperature-gradient modes. In CGWB electron-neutral collisions have been introduced and are now taken into account. The model has been validated by comparing CGWB linear analysis with other models previously proposed and experimental results as well. Kinetic effects on collisional drift waves are investigated, resulting in a less effective growth rate, and the transition from collisional drift waves to ITG instability depending on the ion temperature gradient is studied.


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