Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (en)

Yu. V. Gott, E. I. Yurchenko

Russian Research Centre "Kurchatov Institute", Moscow, Russia

Abstract: An analysis of drift trajectories of charged particles in tokamak leads us to the conclusion on the possibility of a new longitudinal electric current which appears, in contrast to the bootstrap current, to be proportional to plasma pressure. The qualitative difference in drift trajectories of particles, which move in co- and counter- direction with respect to magnetic field produces velocity-space asymmetry of the trapping boundary of charged particles. As a result the new electric current generates. We named this current an asymmetry current. The approximate formula for the asymmetry current in tokamaks and stellarators, which is valid for the entire plasma column, including the near-axis region, is obtained. It is shown that the density of asymmetry current is maximal near magnetic axis and decreases at plasma periphery. The possibility of the experimental detecting of the asymmetry current in stellarators is discussed.

1. Gott Yu. V, Yurchenko E. I. Asymmetry current in tokamaks. Plasma Control and Plasma Facing Components: 2nd IAEA Technical Committee Meeting on Steady-State Operation of Magnetic Fusion Devices (Fukuoka, Japan, Oct. 25th - 29th, 1999) Vol. III, p. 794.

2. Treffert J. D., Shohet J. L., Berk H. L. Phys. Rev. Letters 53 (1984) 2409. https://doi.org/10.1103/PhysRevLett.53.2409

3. Ogawa Y., Amano T., Nakajima N. et al. Nuclear Fusion 32 (1992) 119. https://doi.org/10.1088/0029-5515/32/1/I10