Author: Kasughai, A.
Paper Title Page
MOZB02 Challenges of the High Current Prototype Accelerator of IFMIF/EVEDA 52
  • J. Knaster, Y. Okumura
    IFMIF/EVEDA, Rokkasho, Japan
  • P. Cara
    Fusion for Energy, Garching, Germany
  • A. Kasughai
    Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
  • M. Sugimoto
    QST/Takasaki, Takasaki, Japan
  LIPAc, under installation in Rokkasho will produce a 125 mA CW deuteron beam at 9 MeV. The objective of IFMIF is to generate a neutron flux of 1018 m-2s−1 at 14 MeV for fusion materials testing using 2 x 125 mA CW D+ beams at 40 MeV impacting on a liquid lithium jet of 15 m/s. An ECR deuteron injector at 140 mA and 100 keV will be the source for a 9.7m long 4-vane RFQ, which will be complemented by a 175 MHz SRF linac composed of 8 HWRs for producing 9 MeV D+ beam. For a beam transmission >90%, beam simulations demand a D+ beam emittance below <0.3π mm·mrad. The first attempt on such high current accelerator was in the US in the early 80s under FMIT project with a H2+ 100 mA CW 2 MeV beam. LEDA successfully conducted 100 mA CW H+ at 6.7 MeV at the RFQ output energy in the late 90s, but using superconducting HWRs accelerating cavities at 125 mA CW with low-β H+/D+ beam has never been attempted. Beam halo will be monitored with 3 cryogenic μ-loss monitors azimuthally placed in each of the 8 superconducting solenoids interleaved with the HWR structures. A novel approach based on a beam core-halo dual matching has been developed to handle the MW range beam average power.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOZB02  
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