• T. Spickermann, M.J. Borden, R.J. Macek
  LANL, Los Alamos, New Mexico
• C.S. Feigerle
  University of Tennessee, Knoxville, Tennessee
• v.j. Jaggi, S.K. Zeisler
  TRIUMF, Vancouver
• R.W. Shaw
  ORNL, Oak Ridge, Tennessee
• I. Sugai
  KEK, Ibaraki

At the 39th ICFA Advanced Beam Dynamics Workshop HB 2006 we reported on first results of a test of nanocrystalline diamond foils developed at ORNL under operational conditions at the Los Alamos Proton Storage Ring (PSR). We have continued these tests during the 2006 and 2007 run cycles and have been able to compare the diamond foils with the foils that are normally in use in PSR, which were originally developed by Sugai at KEK. We have gathered valuable information regarding foil lifetime, foil related beam loss and electron emission at the foil. Additional insight was gained under unusual beam conditions where the foils are subjected to higher temperatures. In the 2007 run cycle we also tested a Diamond-like-Carbon foil developed at TRIUMF. A Hybrid-Boron-Carbon foil, also developed by Sugai, is presently in use with the PSR production beam. We will summarize our experience with these different foil types and offer an outlook for future foil activities at PSR.

• I. Sugai, Y. Irie, H. Kawakami, M. Oyaizu, A. Takagi, Y. Takeda
  KEK, Ibaraki
• C.S. Feigerle
  University of Tennessee, Knoxville, Tennessee
• M.A. Plum, R.W. Shaw
  ORNL, Oak Ridge, Tennessee

At the 39th ICFA HB2004 workshop and the EPAC-2006 conference, we reported the lifetime and properties of the HBC (Hybrid type Boron-mixed Carbon) foils, a newly developed material, measured by the use of a 3.2 MeV Ne⁺ ion beam, which deposits significant energy in the foil due to the heavy ion. The content reported showed superior durability against high temperature damage due to foil deformation, thickness reduction and pinhole production at 1700 ± 100K compared with the cluster foils made by the CADAD method. This time, we measured the lifetime of the HBC-foils and the high quality nanocrystalline diamond foils including commercially available foils at 1800 ± 100K which induces the high temperature damage. The measurements were performed by using the KEK-650 keV high intensity H^- and DC beam, which generates the same energy deposition as the RCS of J-PARC. In this workshop, we report the results obtained.

Slides