A high currrent H{sup {minus}} RF volume ion source
Conference
·
OSTI ID:199703
- Lawrence Berkeley Lab., CA (United States)
The Superconducting Super Collider (SSC) RF-driven volume ion source, routinely provides a 35 kV, > 30 mA H{sup {minus}} beam with a normalized rms emittance ({sup epsilon}{sub n}-rms) < 0.1 {pi} mm-mrad. The source is operated with a 100 {mu}s pulse width at 10 Hz repetition rate. To enhance H{sup {minus}} output, the ion source has been modified with a dispenser to introduce a trace amount of cesium into the plasma grid collar. A separate plasma grid heater element controls the temperature of the cessiated surfaces. The authors have seen beam current as high as 102 mA with an electron to H{sup {minus}} current ratio close to one. Preliminary emittance measurements at 75 mA, showed a 30% increase over the uncessiated emittance values. The authors fully expect improvements in the beam output emittance when the extraction optics are optimized. This enhanced, very reliable, source is a strong candidate for high current H{sup {minus}} accelerators. The latest experimental data will be presented.
- OSTI ID:
- 199703
- Report Number(s):
- CONF-941129--
- Country of Publication:
- United States
- Language:
- English
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