Confinement of Nonneutral Plasmas in the Prototype Ring Trap Device
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} {similar_to} 10{sup 13} m{sup {minus}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 {triangle}n{sub e} {similar_to} 10{sup 13} m{sup -3} is already beyond the critical value which is required to produce enough self-electric field E in non-neutral plasmas with n{sub 0} {similar_to} 10{sup 19} m{sup -3}, causing a strong E x B flow thoroughly over the plasmas where the hydrodynamic pressure of the flow is predicted to balance with the thermal pressure of the plasmas.
- Research Organization:
- University of Tokyo, Department of Advanced Energy, Graduate School of Frontier Sciences, Tokyo (JP)
- Sponsoring Organization:
- none (US)
- OSTI ID:
- 783955
- Report Number(s):
- ISBN 1-56396-913-0; ISSN 0094-243X; CODEN APCPCS; ISBN 1-56396-913-0; ISSN 0094-243X; CODEN APCPCS; TRN: US0104159
- Resource Relation:
- Conference: 1999 Workshop on Non-Neutral Plasmas, Princeton, NJ (US), 08/02/1999--08/05/1999; Other Information: PBD: 31 Dec 1999
- Country of Publication:
- United States
- Language:
- English
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