Abstract
A solid hydrogen target has been developed for the beam–plasma interaction with a GM cycle cryo-refrigerator. The hydrogen gas was fed into the solid forming cell at a pressure of about 30 Torr, and condensed directly into crystal. The hydrogen target could be repeatedly produced every 10 min without breaking vacuum. A TEA–CO 2 laser irradiated the solid hydrogen target with an intensity of 2.2×10 8 W/cm 2 to produce a high density plasma. Optical diagnostics of a hydrogen plasma gave a maximum electron density of 2×10 17 cm −3 and a maximum electron temperature of 9 eV.
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