High beta capture and mirror confinement of laser produced plasmas. Semiannual report, August 1, 1974--January 31, 1975

Effect of localized cold plasma on DCLC stability in mirror plasmas

“…For these and the subsequent calculations reported in this letter, the radial scale length, R p , was taken to be about ten percent of the magnetic scale length, Rp^O.l L m , where L m was taken to be 11 cm. These parameters fit the plasma and magnetic-field geometry for plasmas in the LITE facility [13].…”

“…The combination of a locally peaked cold-ion distribution with a low-level uniform distribution was considered. For plasmas typical of those produced by injection of energetic neutrals into a warm target plasma in the LITE mirror facility [13], the ratio of cool (T w ^3 0 eV) to hot plasma (T H s 10 keV) in the uniform portion of the cold-ion distribution, (n u /n H ), is plotted against the cool-to-hot ratio in the peak, ( n o/ n H)> m Fig- 2. For cold-ion peaks which have normalized axial scale lengths L s = L/L m >0.4, significant decreases in the uniform component can be achieved with values of peak ratio less than or comparable to the uniform ratio required in the absence of of a peak.…”