Long-pulse ion source for neutral-beam applications

Journal Article · Thu Apr 01 04:00:00 EST 1982 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1137007· OSTI ID:5425121

Tsai, C C; Menon, M M; Ryan, P M; Schechter, D E; Stirling, W L; Haselton, H H

A rectangular ion source is being developed for producing 120-keV/25-A hydrogen ion beams for pulse durations up to 10 s. It consists of a plasma generator with a rectangular arc chamber (25 x 35 cm cross section) and an ion accelerator with rectangular grids (10 x 25 cm hole pattern). The plasma generator is a modified duoPIGatron type. It has been operated at 120 V, 1100 A, and 10 s arc durations to produce a dense and uniform plasma sufficient for supplying a 25-A ion beam current. The electron emitter used is either a LaB/sub 6/ hollow cathode or a LM (molybdenum doped with La/sub 2/O/sub 3/) indirectly heated cathode. The ion accelerator having four (or three) rectangular grids with multiple circular apertures has been utilized to form high-energy ion beams above (or below) 80 keV. With substantial improvements in water cooling and mechanical stability, this ion accelerator has been operated reliably to deliver long-pulse ion beams with energies in excess of 100 keV and pulse lengths of many seconds. The results of measurements made on the power transmission efficiency (70%--80%), power density profile at the target ( +- 0.5% HWHM near the focal plane), and grid loadings (< or approx. =1% for each grid) are elaborated. The important characteristics associated with this long-pulse ion source are also presented and discussed.

• Research Organization: Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5425121
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 53:4; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular &amp; Chemical Physics-- Beams &amp; their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
APERTURES
BORIDES
BORON COMPOUNDS
CATHODES
CHARGED PARTICLES
COOLING
CURRENTS
DATA
DISTRIBUTION
ELECTRIC ARCS
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRODES
ELEMENTS
ENERGY RANGE
GRIDS
HOLLOW CATHODES
HYDROGEN IONS
INFORMATION
ION SOURCES
IONS
KEV RANGE
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
METALS
MOLYBDENUM
NEUTRAL BEAM SOURCES
OPENINGS
PENNING ION SOURCES
PLASMA
POWER DENSITY
PULSES
RARE EARTH COMPOUNDS
SPATIAL DISTRIBUTION
STABILITY
TRANSITION ELEMENTS