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[en] Several results from the GAMMA 6 (tandem mirror) confinement experiments are reported. The target plasma with 5x1013cm-3 density is produced by hydrogen-loaded titanium washer guns, and is stable macroscopically in the tandem mirror magnetic field configuration. The neutral beam (7keV, 1.5A) injection into the target plasma at both side plug mirrors raises each plasma potential. The tandem-type plug potential is then confirmed experimentally in GAMMA 6. Some formation of plug potential by heating plasma electrons with a relativistic electron beam (360keV, 50kA, 50ns) is also observed. An application of an RF plug on the end-sheet plasma in the tandem mirror considerably increases the confinement time of the plasma produced by ECR microwave in GAMMA 6. This RF plug includes the adiabatic effect. These experimental results show the improvement of mirror-type plasma confinement and suggest the increase of Q value in the tandem mirror. (author)
Source
International Atomic Energy Agency, Vienna (Austria); Nucl. Fusion; Suppl. 1979; v. 2 p. 437-443; ISBN 92-0-130179-0; 
; 1979; v. 2 p. 437-443; IAEA; Vienna; 7. international conference on plasma physics and controlled nuclear fusion research; Innsbruck, Austria; 23 - 30 Aug 1978; IAEA-CN--37/J-5
; 1979; v. 2 p. 437-443; IAEA; Vienna; 7. international conference on plasma physics and controlled nuclear fusion research; Innsbruck, Austria; 23 - 30 Aug 1978; IAEA-CN--37/J-5