Coaxial Plasma Gun in the High-Density Regime and Injection into a Helical Field

A modified CPG in the high density regime of 20-70mT of He was investigated. The injection of the plasmatorus into a driftspace was studied by diamagnetical diagnostics both with and without helical bias, where the inner electrode was continued into the driftspace by a central conductor. Quasi-tokamak geometry is obtained (q almost-equal-to 3; l(j) almost-equal-to 1.2; beta(p) almost-equal-to .7). Mean speed of torus in driftspace: 2.2cm/musec; which is in very good agreement with the MHD model derived. Discussion of: (1) general phenomena, (2) second half-period breakdown with autopreionisation, (3) prevention of transv. expansion by rarefaction waves of Mach 50 supersonic flow, (4) stability and homogeneity enhancement, (5) agreement with model, (6) X-points & breakdown dependence. The findings are important for future designs of injectors for magn. confinement.


Published in:
Helvetica Physica Acta, 67, 2, 217-218
Year:
1994
ISSN:
0018-0238
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-01-28


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