Emittance measurements in Grumman 1 MeV beamline
The emittance of a 30 keV H{sup {minus}} beam has been measured with an Allison type electrostatic analyser at two positions separated by 85 cm along the Grumman 1 MeV beamline LEBT at low currents (about 4 mA, no Cs{sub 2}O additive in the source) and at higher currents (10-15 mA, with Cs{sub 2}O additive in the source). No emittance growth was observed between the two positions, but, at the higher current level, the emittance was about 60% higher than at the low current level ({Sigma}{sub n},rms = .0045 {pi} cm-mrad vs. 0070 {pi} cm-mrad). Argon was then introduced up to a partial pressure of 4x10{sup {minus}5} torr, and the emittance decreased back to a range corresponding to that found at the lower currents. However, beam noise was observed at the downstream position, and there is evidence for a small amount of emittance growth (<20%) between the two positions.
- OSTI ID:
- 127816
- Report Number(s):
- CONF-920376-; ISSN 0003-0503; CNN: Project 7256-2709; TRN: 96:000292
- Journal Information:
- Bulletin of the American Physical Society, Vol. 37, Issue 9; Conference: Meeting of the American Physical Society, Indianapolis, IN (United States), 16-20 Mar 1992; Other Information: PBD: Dec 1992
- Country of Publication:
- United States
- Language:
- English
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