Potential structure of a plasma hole in a rotating magnetized plasma
| dc.creator | Yoshimura, Shinji | |
| dc.creator | Okamoto, Atushi | |
| dc.creator | Tanaka, Masayoshi Y. | |
| dc.date | 2004-10-19 | |
| dc.date.accessioned | 2026-07-07T05:52:58Z | |
| dc.date.available | 2026-07-07T05:52:58Z | |
| dc.description | We have observed spontaneous formation of a stationary vortex structure in a rotating magnetized plasma produced in a linear ECR plasma device named HYPER-I at National Institute for Fusion Science. The vortex appears with a deep density-cavity, plasma hole, in its center, and is identified as a dissipative vortex in viscous fluids (Burgers vortex) [1]. The kinematic viscosity estimated from the vorticity profile and the ion flow field is 4 orders of magnitude higher than the classical value, which may be attributable to insufficiency of the Debye shielding or the breaking of quasi-neutrality. Here we present the results of potential measurements and the evaluation of quasi-neutrality breaking. It is revealed that the potential has a bell-shaped axisymmetric structure localized inside the core region, in which its maximum value exceeds 5 Te. Using Poisson's equation, degree of quasi-neutrality breaking is evaluated, which shows 3 orders of magnitude larger than that of usual laboratory plasma. The strong electric field produced by this quasi-neutrality breaking drives the supersonic rotation of the plasma hole. It should be mentioned that the degree of quasi-neutrality breaking in the ambient region of the plasma hole is comparable to that of usual laboratory plasma. Hence the plasma hole can be considered as the structure of a nonneutral core surrounded by a quasi-neutral plasma. It is of great interest to study the fluctuations associated with the connected structure of the nonneutral and the quasi-neutral plasma, especially the interfacial layer in between. Our preliminary observation shows that the pronounced fluctuations exist in the interfacial layer. [1] K. Nagaoka, A. Okamoto, S. Yoshimura, M. Kono, and M. Y. Tanaka, Phys. Rev. Lett. 89 (2002) 075001 | |
| dc.description | 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France) | |
| dc.identifier | https://arxiv.org/abs/physics/0410136 | |
| dc.identifier | http://arxiv.org/abs/physics/0410136 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/86493 | |
| dc.subject | Plasma Physics | |
| dc.title | Potential structure of a plasma hole in a rotating magnetized plasma | |
| dc.type | text |