A high current H{sup {minus}} radio frequency volume ion source

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1145519· OSTI ID:56012

Saadatmand, K; Arbique, G; Hebert, J; Valicenti, R ^[1]; Leung, K N ^[2]

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1. Superconducting Super Collider Laboratory, 2550 Beckleymeade Avenue, Dallas, Texas 75237-3946 (United States)
2. Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

The superconducting super collider rf-driven volume ion source routinely provided 35 kV, {gt}30 mA H{sup {minus}} beams with normalized rms emittances ({var_epsilon}{sub n-rms}) {lt}0.1 {pi} mm mrad. The source was typically operated with a 100 {mu}s beam pulse width at a 10 Hz repetition rate. To enhance H{sup {minus}} output, the ion source was modified to accommodate a set of cesium dispensers so that a trace amount of cesium could be introduced into the plasma grid collar. A plasma grid heater element controls the temperature of the cesiated surfaces and the rate of cesium dispensation. Beam currents in excess of 100 mA and electron to H{sup {minus}} current ratios close to one have been observed. Emittance measurements at 70 mA suggest a 20% increase over uncesiated emittance values. Improvements in the beam emittance are fully expected when the extraction optics are optimized. This enhanced, very reliable source is a strong candidate for high current H{sup {minus}} accelerators.

• OSTI ID: 56012
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 6 Vol. 66; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM EMITTANCE
CESIUM
HYDROGEN IONS 1 MINUS
ION SOURCES
MILLI AMP BEAM CURRENTS
RF SYSTEMS
SUPERCONDUCTING SUPER COLLIDER