Confinement of nonneutral plasmas in the Prototype Ring Trap device
- University of Tokyo, Department of Advanced Energy, Graduate School of Frontier Sciences 7-3-1 Hongo, Bunkyo Ward, Tokyo 113-0033 (Japan)
Recently, an internal-ring device named Proto-RT (Prototype Ring Trap) was constructed at University of Tokyo, and experiments on the device have been intensively conducted. The main goal of Proto-RT is to explore an innovative method to attain a plasma equilibrium with extremely high-{beta}({beta}>1) in a toroidal geometry using non-neutral condition. At the first series of the experiments, pure electron plasmas (n{sub e}{approx}10{sup 13} m{sup -3}) have been successfully confined inside a separatrix. No disruption is so far observed. The confinement time of the electron plasmas is of order 0.1 ms for an X point configuration. The non-neutrality of {delta}n{sub e}{approx}10{sup 13} m{sup -3} is already beyond the critical value which is required to produce an enough self-electric field E in non-neutral plasmas with n{sub 0}{approx}10{sup 19} m{sup -3}, causing a strong ExB flow thoroughly over the plasmas where the hydrodynamic pressure of the flow is predicted to balance with the thermal pressure of the plasmas.
- OSTI ID:
- 21210379
- Journal Information:
- AIP Conference Proceedings, Vol. 498, Issue 1; Conference: Workshop on non-neutral plasma physics III, Princeton, NJ (United States), 2-5 Aug 1999; Other Information: DOI: 10.1063/1.1302141; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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