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Feigerle, C. S.

Paper Title Page
MOPAN040 Comparative Study on Lifetime of Stripper Foil using 650keV H- Ion Beam 245
 
  • A. Takagi, I. Sugai, Y. Takeda
    KEK, Ibaraki
  • C. S. Feigerle
    University of Tennessee, Knoxville, Tennessee
  • Y. Irie
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • M. A. Plum, R. W. Shaw
    ORNL, Oak Ridge, Tennessee
 
  Funding: This work is supported by the Japan Society for the Promotion of Science, under contract No. 18540303.

Thick carbon stripper foils of >300 μg/cm2 will be used as a stripping of H-ion beam for 3GeV Rapid Cycling Synchrotron (3GeV-RCS) of the J-PARC. The carbon foils with long lifetime even at >1800 K are required. For this purpose, we have developed a new irradiation system for the lifetime measurement using high current pulsed and dc H- beams of the KEK Cockcroft-Walton accelerator. These high power 650keV H- Ion beams can simulate the high energy deposition in carbon stripper foils at the J-PARC RCS. An automatic data acquisition system is also developed for recording the data of foil temperature and irradiated beam current. The Hybrid Boron mixed Carbon (HBC) stripper foils, which are developed at KEK are irradiated by high current H- ion beam up to 2000 K. A few SNS-diamond and commercially available carbon (CM) foils are also tested for comparing with HBC-foils. The results of the lifetime measurement of HBC and SNS-diamond including CM stripper foils are reported.

 
MOPAS081 Spallation Neutron Source (SNS) Diamond Stripper Foil Development 620
 
  • R. W. Shaw, M. A. Plum, L. L. Wilson
    ORNL, Oak Ridge, Tennessee
  • M. J. Borden, T. Spickermann
    LANL, Los Alamos, New Mexico
  • C. S. Feigerle
    University of Tennessee, Knoxville, Tennessee
  • Y. Irie
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • I. Sugai, A. Takagi
    KEK, Ibaraki
 
  Funding: SNS is managed by UT-Battelle, LLC, for the U. S. DOE under contract DE-AC05-00OR22725. DOE contract W-7405-ENG-36 (LANL) and Japan SPS contract 18540303 (KEK) supported work at those institutions.

Diamond stripping foils are under development for the SNS. Free-standing, flat 350 microgram/cm2 foils as large as 17 x 25 mm have been prepared. These nano-textured polycrystalline foils are grown by microwave plasma-assisted chemical vapor deposition in a corrugated format to maintain their flatness. They are mechanically supported on a single edge by a residual portion of their silicon growth substrate; typical fine foil supporting wires are not required for diamond foils. Six foils were mounted on the SNS foil changer in early 2006 and have performed well in commissioning experiments at reduced operating power. A diamond foil was used during a recent experiment where 12 microCoulombs of protons, approximately 40% of the design value, were stored in the ring. A few diamond foils have been tested at LANSCE/PSR, where one foil was in service for a period of five months (820 Coulombs of integrated injected charge) before it was replaced. Diamond foils have also been tested in Japan at KEK (650 keV H-) where their lifetimes slightly surpassed those of evaporated carbon foils, but fell short of those for Sugai's new hybrid boron carbon (HBC) foils.