Abstract
In the 3-GeV Rapid Cycling Synchrotron (RCS) at Japan Proton Accelerator Research Complex (J-PARC), we adopted thick Hybrid type Boron-doped Carbon (HBC) stripper foil for multi-turn H- charge-exchange injection. The HBC stripper foil developed at KEK has demonstrably improved the foil lifetime significantly. In addition, Graphite Thin Films (GTF) developed by KANEKA corp. was attempted to use for user operation. The GTF is a multilayer graphene sheet and it is expected to be a new candidate for highly durable charge stripping foil. HBC and GTF foils can be both employed the J-PARC RCS for long-term user operation. Early manufacturing of the stripper foil for the J-PARC was carried out according to the following two steps: foil fabrication at the KEK Tsukuba site and foil preparation at the JAEA Tokai site. Recently, the HBC foil deposition apparatus was relocated from KEK to JAEA, and new HBC foils were fabricated at the Tokai site. The performance of the new HBC foil was verified to be equivalent to the original HBC foil with offline beam irradiation tests. Furthermore, the use of the new HBC foils was successfully demonstrated during RCS user beam operation for one week.
Highlights
The Japan Proton Accelerator Research Complex (J-PARC) is a multipurpose high intensity proton accelerator facility [1, 2]
The Hybrid type Boron-doped Carbon (HBC) foil deposition apparatus was relocated from the KEK Tsukuba site to the Japan Atomic Energy Agency (JAEA) Tokai site, and we have started fabrication of a new HBC foil. (We call the new foil fabricated at the JAEA Tokai site J-HBC foil.)
We report the satisfactory results of the original HBC foil obtained over long-term user operation of Rapid Cycling Synchrotron (RCS)
Summary
The Japan Proton Accelerator Research Complex (J-PARC) is a multipurpose high intensity proton accelerator facility [1, 2]. J-PARC consists of three accelerators, namely, a 400-MeV LINAC, a 3-GeV Rapid Cycling Synchrotron (RCS), and a 30-GeV Main Ring Synchrotron (MR), and three experimental facilities, namely, a Materials and Life Science Experimental Facility (MLF), a Hadron Experimental Hall (HD), and a Neutrino Beam Line to the SuperKamiokande (NU). In this chain of accelerators, the RCS performs two functions; as a proton driver to produce pulsed muons and neutrons at MLF and as an injector to MR, aiming at 1 MW output beam power. The results of various offline tests for the performance evaluation of the new J-HBC foil and trial use in J-PARC RCS are reported
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