期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 81, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3266141
关键词
hydrogen; plasma focus; plasma inertial confinement; plasma transport processes; transparency
Neutral beam with geometrical focusing for plasma heating in moderate-size plasma devices has been developed in Budker Institute of Nuclear Physics, Novosibirsk. When operated with hydrogen, the neutral beam power is 1 MW, pulse duration is 1 s, beam energy is 40 keV, and angular divergence is 1.2 degrees. Initial ion beam is extracted and accelerated by triode multiapertures ion-optical system. To produce 1 MW neutral beam, about 40 A proton current is extracted with nominal current density of 320 mA/cm(2). Ion-optical system has 200 mm diameter grids with 44% transparency. The grids have inertia cooling and heat is removed between the pulses by water flowing in channels placed on periphery of the grids. A plasma emitter for ion extraction is produced by rf-plasma box. Ion species mix of rf plasma source amounts to 70%, 20%, and 10% of H(+), H(2)+, and H(3)+ ions, respectively, by current. Heavy impurities contribute less than 0.3%.
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