Abstract
A method of eliminating plasma leakage by connecting cusps with a magnetic field bridge has been, described by Tuck (4). Here we discuss a multipole configuration employing this idea but with no circumferential (Bz) field. High β plasma is confined with no free plasma surface in the usual cusp model sense. The stability diagram for such configurations can be obtained with the pressure of the plasma as a parameter. Generally this condition on the structure can be stated as (B2/B1)2 >r/d wherer is the radius of the current carrying rods which produce the multipole field,2d is the distance between a rod and the conducting wall (bridge width), andB2 andB1 are the maximum and minimum fields along the wall surface. Approximations resulting from the magnetohydrodynamic treatment are considered. Some practical questions are mentioned and it is shown that in a sample case one expect confinement time of ∼ 10−2 s for a plasma temperature of 104 eV.
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