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

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4932573· OSTI ID:22482950

Ohkoshi, K.; Ikegami, K.; Takagi, A.; Asano, H.; Oguri, H. ^[1]

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1. J-PARC Center, Tokai-Mura, Naka-Gun, Ibaraki-Ken 319-1195 (Japan)

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.

• OSTI ID: 22482950
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM HOLES
BEAMS
DESIGN
ELECTRODES
FILTERS
GASES
IMPURITIES
ION SOURCES
J-PARC
LENGTH
MAGNETS
TUNING