Low energy, high power hydrogen neutral beam for plasma heating

Journal Article · Sun Nov 15 04:00:00 EST 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4936292· OSTI ID:22482600

Deichuli, P.; Davydenko, V.; Mishagin, V.; Sorokin, A.; Stupishin, N. ^[1]; Korepanov, S.; Smirnov, A. ^[2]

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1. Budker Institute of Nuclear Physics, Prospect Lavrentieva 11, 630090 Novosibirsk (Russian Federation)
2. Tri Alpha Energy, Inc., Foothill Ranch, California 92610 (United States)

A high power, relatively low energy neutral beam injector was developed to upgrade of the neutral beam system of the gas dynamic trap device and C2-U experiment. The ion source of the injector produces a proton beam with the particle energy of 15 keV, current of up to 175 A, and pulse duration of a few milliseconds. The plasma emitter of the ion source is produced by superimposing highly ionized plasma jets from an array of four arc-discharge plasma generators. A multipole magnetic field produced with permanent magnets at the periphery of the plasma box is used to increase the efficiency and improve the uniformity of the plasma emitter. Multi-slit grids with 48% transparency are fabricated from bronze plates, which are spherically shaped to provide geometrical beam focusing. The focal length of the Ion Optical System (IOS) is 3.5 m and the initial beam diameter is 34 cm. The IOS geometry and grid potentials were optimized numerically to ensure accurate beam formation. The measured angular divergences of the beam are ±0.01 rad parallel to the slits and ±0.03 rad in the transverse direction.

• OSTI ID: 22482600
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 86; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BRONZE
HYDROGEN
KEV RANGE 10-100
MAGNETIC FIELDS
OPTICAL SYSTEMS
PERMANENT MAGNETS
PLASMA HEATING
PLASMA JETS
PROTON BEAMS