Izvorni znanstveni članak
Impurity of dust-acoustic plasma instability due to trapped ions
Kh. H. El-Shorbagy
; Institut für Theoretische Physik IV and Excellence Centre for Plasma Science and Astrophysics, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Permanent address: Plasma Physics Department, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt
Sažetak
We are investigating the low-frequency electrostatic perturbation in tokamak plasma in the "banana" regime by taking account the effects of the Coulomb collision on the trapped ion. We consider the dust-acoustic plasma instability caused by the presence of ion impurities. We point out that the presence of impurity ions, especially if their density gradient is different from the dust plasma density gradient, i.e., if they are peaked near the wall, can generate a new instability which is difficult to stabilize and which leads to diffusion of the impurities into the dust-acoustic plasma.
Ključne riječi
tokamak plasma; "banana" regime; dust-acoustic plasma instability; diffusion of impurities
Hrčak ID:
302539
URI
Datum izdavanja:
1.7.2008.
Posjeta: 208 *