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Title: Fine-tuning to minimize emittances of J-PARC RF-driven H{sup −} ion source

The Japan Proton Accelerator Research Complex (J-PARC) cesiated RF-driven H{sup −} ion source has been successfully operated for about one year. By the world’s brightest level beam, the J-PARC design beam power of 1 MW was successfully demonstrated. In order to minimize the transverse emittances, the rod-filter-field (RFF) was optimized by changing the triple-gap-lengths of each of pairing five piece rod-filter-magnets. The larger emittance degradation seems to be caused by impurity-gases than the RFF. The smaller beam-hole-diameter of the extraction electrode caused the more than expected improvements on not only the emittances but also the peak beam intensity.
Authors:
; ; ; ; ;  [1]
  1. J-PARC Center, Tokai-Mura, Naka-Gun, Ibaraki-Ken 319-1195 (Japan)
Publication Date:
OSTI Identifier:
22482950
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:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM HOLES; BEAMS; DESIGN; ELECTRODES; FILTERS; GASES; IMPURITIES; ION SOURCES; J-PARC; LENGTH; MAGNETS; TUNING