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Title: Charge neutralized low energy beam transport at Brookhaven 200 MeV linac

The H{sup −} magnetron source provides about 100 mA H{sup −} beam to be match into the radio-frequency quadrupole accelerator. As H{sup −} beam traverses through low energy transport, it ionizes the residual gas and electrons are repelled and positive ions are trapped in the beam, due to negative potential of the beam, providing charge neutralization for the H{sup −} beam. The neutralization time for the critical density depends upon the background gas and its pressure. Critical density for xenon gas at 35 keV is about 43 times smaller than that of hydrogen and stripping cross section is only 5 times than that of hydrogen gas. We are using xenon gas to reduce neutralization time and to improve transmission through the 200 MeV linac. We are also using pulse nitrogen gas to improve transmission and stability of polarized H{sup −} beam from optically pumped polarized ion source.
Authors:
; ; ;  [1]
  1. Brookhaven National Laboratory, Upton, New York 11786 (United States)
Publication Date:
OSTI Identifier:
22483041
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM TRANSPORT; BEAMS; BROOKHAVEN 200-MEV LINAC; CATIONS; CROSS SECTIONS; HYDROGEN; ION SOURCES; MAGNETRONS; MEV RANGE 100-1000; POWER TRANSMISSION; PUMPS; RADIOWAVE RADIATION; STRIPPING; XENON