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- W127661464 abstract "Recent results on plasma heating by neutral beams in conjunction with rf heating at the electron and ion cyclotron resonances (ECR and ICR) and experiments on the injection of solid hydrogen pellets into the plasma are reported. The plasma in the Heliotron E is produced by ionization of a gas by microwave power produced by two gyrotrons (ECR, 53.2 GHz, 2 x 220 kW). Neutral beams with a total power up to 2.6 MW are injected into the plasma 20--40 ms after the beginning of the ICR heating pulse, with a power up to 400 kW. The injection of these neutral beams produces a high-energy current-free plasma. A plasma with a density of 1.9 x 10/sup 13/ cm/sup -3/ and a peak ion temperature of 1 keV is produced at a magnetic field of 1.9 T. The maximum value of the product n/sub e/tau/sup n/et/sub E/ is 2.4 x 10/sup 12/ s/cm/sup 3/. The value of ..beta.. = 8..pi..n/sub e/(T/sub e/+Ti)/B/sup 2/ was maximized in a magnetic field of 0.94 T during neutral beam injection. The background plasma was produced at the second ECR harmonic. Under these conditions, the value ..beta..(0) = 3.6% was achieved at the axis of themore » plasma column, and the average value over the volume was beta-bar = 2%. Preliminary experiments have been carried out on the injection of pellets and on ICR heating. The basic aspects of ICR heating have been determined. Pellet injection has raised the plasma density to 1.3 x 10/sup 14/ cm/sup 3/. The injection of pellets is an effective method for producing a dense plasma.« less" @default.
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- W127661464 date "1985-01-01" @default.
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- W127661464 title "Review of recent experiments on a current-free plasma in the Heliotron E" @default.
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