EXPERIMENTAL RESULTS ON TRAPPING A GUN PLASMA IN A TOROIDAL MAGNETIC CUSP EXPERIMENT
A start-up method for producing a plasma in the bi-cusp field configuration of a toroidal magnetic cusp (TORMAC) is described. The method uses the radial injection and trapping of a toroidal gun plasma. Measurements of an injected plasma with a velocity of 17 {micro}sec{sup -1} and 4.5 x 10{sup 18} particles is presented. The plasma was observed to be stopped and trapped in an equilibrium position. A well-defined outer boundary remained stationary for 20 {micro}sec. Particle flux distribution emanating from the cusp field lines defined a sheath having a width of 1-1.5 ion gyroradii in the poloidial field. This translates to a narrow outer boundary and a broad inner boundary based on the gradient of the poloidial field at the two radial positions. Measurements of Thomson scattering and interferometry give a T{sub e} of 15eV, a 15 {micro}sec density decay time, and a 5 {micro}sec energy decay time. These results show that this injection and trapping method is successful, and thus a higher gun plasma energy combined with a flux conserving barrier may lead to higher temperatures for testing containment in TORMAC.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Accelerator& Fusion Research Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 1030587
- Report Number(s):
- LBL-10453-Rev.; JPLPBZ; TRN: US201124%%334
- Journal Information:
- Journal of Plasma Physics, Vol. 32, Issue 3; ISSN 0022-3778
- Country of Publication:
- United States
- Language:
- English
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