Effects of end cell ion cyclotron fluctuations on central-cell ion confinement in the tandem mirror experiment (TMX) Page: 2 of 10
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Effects of End Cell Ion Cyclotron Fluctuations on Central-Cell
Ion Confinement in the Tandem Mirror Experiment (TMX)*
1 D. P. Grubb, T. A. Casper, J. F. Clauser
F. H. Coensgen, D, L. Correll, W. C. Cummins,
R. P. Drake, J. H. Foote, A, K. Futch, R. K. Goodman
R. S. llornady, W. E. Nexsen, P. Poulsen, T. D. Rognli.en,
T. C. Simonen, G. R, Smith, and B. W. Stallard
uawrence Livermore Laboratory, University of California
Livermore, California 94550 USA
Abstract: The tandem mirror device (TMX) exhibits gross stability to both MHD
and oicroinstability modes. The end-cell plasmas provide the tandem with
average minimum-B stabi 1i;y, while the efflux of plasma from the central cell
maintains the end cells (plugs) at marginal stability to loss cone modes. For
some operating conditions, a residual level of plug ion cyclotron fluctuations
is detected. These oscillations dominate the fluctuation frequency spectra in
both the plugs and the central cell. The presence of plug ion cyclotron
fluctuations in the central cell leads to resonance heating of some of the
central cell ions. This heating degrades the confinement of the central cell
ions; thereby increasing the amount of warm plasma stream flowing through the
plugs.
1. Introduction
In the tandem mirror device (TMX), a large volume of plasma is confined
in a solenoidal magnetic field (central cell) between two minimum-B magnetic
mirror machines (Fig. 1). The plasma in the minimum-B mirrors performs two
important functions. Since the plasma density in the minimum-B mirrors is
greater (nominal factor 3) than that of the central cell plasma, the plasma in
the end mirrors rises to a plasma potential which is more positive than the
*Uork performed under the auspices of the U. S. Department of Energy by
Lawrence Livermore Laboratory under contract number W-7405-ENC-4S.
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Grubb, D. P.; Casper, T. A. & Clauser, J. F. Effects of end cell ion cyclotron fluctuations on central-cell ion confinement in the tandem mirror experiment (TMX), article, April 7, 1980; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1093045/m1/2/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.