Studies on Trapping of Laser-Produced Plasma by SL-1 Surmac

概要

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A beryllium plasma was produced in a small "Surmac" container (named SL-1 Surmac), by utilizing a neodymium-glass laser of 〜 5J and 〜 35ns (FWHM). The dependence of the initial particle loss due to the plasma effusion across the container field on the magnetic field strength of the Surmac was observed, and it was found that the effusion decreases drastically above a certain threshold value of the magnetic field. At stronger field, the total amount of plasma particles trapped by the container attains its maximum about 20 μs after the laser shot and it is 25 to 37 percent of that initially produced by the laser pulse. The plasma parameters obtained are as follows : average electron density 3 × 10^<12> cm<-3>, electron temperature 〜 10 eV and maximum plasma-beta value at outer "bridge" position, three percent. The plasma particle confinement time is about 44 μs, it exhibits a very weak dependence on the magnetic field and agrees approximately with that calculated from the particle loss to the mechanical supports for the internal current conductors and the beryllium target alone.
社団法人応用物理学会の論文
1983-01-20