BNL negative ion based neutral beam development

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5780027

Alessi, J G; Hershcovitch, A; Kovarik, V; Larson, R A; McKenzie-Wilson, R; Prelec, K; Sluyters, T

The BNL Neutral Beam Development Group has as its objective the development of neutral beam systems, using negative ion sources with high current density. In this past year we have made the transition from pulsed high current negative ion sources to sources designed to operate steady state. We are presently testing two dc sources, a magnetron source and a modified magnetron with plasma injection from a hollow cathode discharge (HCD). Both sources have operated with steady state discharges; to date 0.11A of H/sup -/ has been extracted from the standard magnetron while about 1A of H/sup -/ has been produced on a surface, but not extracted, in the HCD system. Present plans are to transport the beam from a 2A magnetron around a bending magnet, followed by dc acceleration of the beam to 200 keV. These units would be stacked to obtain higher currents. The HCD source is expected to operate at much lower pressures (10/sup -4/ - 10/sup -3/ Torr), and therefore close coupled acceleration of the beam to 200 keV is envisioned. This makes the source module considerably more compact. The MEQA-LAC, dc acceleration with periodic electrostatic quadrupole focusing, and the RFQ are being considered as ways to accelerate negative ion beams to energies above 200 keV. In the neutral beam line a novel plasma neutralizer is being considered which uses HCD's to feed a plasma into a solenoidal magnetic field. This should result in a high plasma density (10/sup 13/ - 10/sup 14/ cm/sup -3/) with a low background gas pressure.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5780027
• Report Number(s): BNL-30326; CONF-8110118-3; ON: DE82004810
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
BEAM INJECTION
BEAM TRANSPORT
CATIONS
CHARGED PARTICLES
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
ION SOURCES
IONS
MAGNETRONS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
NEUTRAL BEAM SOURCES
PLASMA BEAM INJECTION
RESEARCH PROGRAMS