A high current H{sup {minus}} radio frequency volume ion source
- Superconducting Super Collider Laboratory, 2550 Beckleymeade Avenue, Dallas, Texas 75237-3946 (United States)
- 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, Vol. 66, Issue 6; Other Information: PBD: Jun 1995
- Country of Publication:
- United States
- Language:
- English
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