A THETA-PINCH GUN USED TO STUDY HIGH-BETA PLASMA INJECTION INTO MAGNETIC FIELDS.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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A small theta-pinch gun has been developed for high-beta injection studies. The gun uses two independently energized coils to create a single doughnut-shaped plasma puff with an average density in a 2-kG field of 1-2 x 10 to the 15th powercc, ion temperature of 35 ev, and directed energy of 200 ev. The transmission of the plasma along Bz, Ioffe, and linear octopole guide fields and its interaction with a magnetic barrier have been studied with a variety of diagnostics, including a specially developed fast far-infrared interferometer. The results indicate that the theta-pinch gun output, limited by flute instabilities during compression and entry into the guide fields, is significantly greater than that of a more conventional, but comparable conical gun that the Bz field is a more satisfactory guide field than either the Ioffe or linear octopole field and that a magnetic barrier can convert a significant amount of directed energy into transverse energy. Author
- Fusion Devices (Thermonuclear)
- Plasma Physics and Magnetohydrodynamics