Skip to main content Accessibility help

Experimental results on trapping a gun plasma in a toroidal magnetic cusp experiment

  • P. A. Pincosy (a1), B. R. Myers (a1), M. A. Levine (a1), B. Feinberg (a1), R. A. Niland (a1) and L. Soroka (a1)...


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 μsec–1 and 4·5 × 1018 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 μsec. 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 Te of 15eV, a 15μsec density decay time, and a 5μsec 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.



Hide All
Berkowitz, J., Grad, H. & Rubin, H. 1958 Proceedings of 2nd United Nations Conference on Peaceful Uses of Atomic Energy, Geneva, vol. 31, p. 171.
Boozer, A. H. & Levine, M. A. 1973 Phys. Rev. Lett. 31, 1287.
Brown, I. G., Feinberg, B., Kunkel, W. B., Levine, M. A., Niland, R. A., Shaw, R. S. & Vaucher, B. G. 1982 Phys. Fluids, 25, 79.
DeHoffman, F. & Teller, E. 1950 Phys. Rev. 80, 692.
Feinberg, B., Niland, R. A., Coonrod, J. & Levine, M. A. 1983 Report LBL-10070.
Gallagher, C. C., Combes, L. S. & Levine, M. A. 1970 Phys. Fluids, 13, 1617.
Greenwald, M. & Smith, W. I. B. 1977 Appl. Optics, 16, 587.
Haines, M. G. 1977 Nucl. Fusion, 17, 811.
Jackson, J. D. 1962 Classical Electrodynamics. Wiley.
Jackson, J. D. 1957 Proc. Phys. Soc. Lond. B 70, 6.
Myers, B. R., Levine, M. A. & Pincosy, P. A. 1979 Report LBL-9507.
Myers, B. R., Levine, M. A. & Shaw, R. S. 1981 Rev. Sci. Instr. 1187.
Osher, J. E. 1962 Phys. Rev. Lett. 8, 305.
Spalding, I. J. 1971 Advances in Plasma Physics (ed. Simon, A. and Thompson, W. B.), vol. 4, p. 79. Wiley.
Spalding, I. J., Eden, M. J., Phelp, A. D. R. & Allen, K. T. 1969 Proceedings of 3rd International Conference on Plasma Physics and Controlled Fusion, Novosibirsk, vol. 2, p. 639. IAEA.
Tidman, D. A. & Krall, N. A. 1971 Shock Waves in Collisionless Plasma. Wiley-Interscience.
Vella, M. C., Feinberg, B. & Niland, R. 1979 Report UCID-8095, LBL.
Vlases, G. C. 1967 Phys. Fluids, 10, 2351.
Watteau, J. P. H. 1961 Phys. Fluids, 4, 6076.
MathJax is a JavaScript display engine for mathematics. For more information see

Experimental results on trapping a gun plasma in a toroidal magnetic cusp experiment

  • P. A. Pincosy (a1), B. R. Myers (a1), M. A. Levine (a1), B. Feinberg (a1), R. A. Niland (a1) and L. Soroka (a1)...


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.