Analyses and the effect of impurities contained in charge stripper foils for the 3-GeV RCS of J-PARC

Yamazaki, Yoichi; Yoshimoto, Masahiro; Saha, Pranab; Kinsho, Michikazu; Taguchi, Tomitsugu; Yamamoto, Satoshi; Sugai, I.

doi:10.1007/s10967-015-4106-5

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…Stable supply of the stripper foils is important from the viewpoint of sustaining stable beam operation in J-PARC. Early manufacturing process of the HBC stripper foil at J-PARC was carried out according to the following two steps, as shown in figure 2: foil fabrication at KEK Tsukuba site and foil preparation at JAEA Tokai site [11].…”

Section: Manufacturing Process Of Hbc Foilsmentioning

confidence: 99%

“…By contrast, we still cannot understand completely why the carbon foils can obtain higher durability against beam irradiation by boron-doping. To analyse the HBC foil by various methods and to understand the mechanism of foil breakage owing to beam irradiation, we have been conducting offline beam tests at Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) in National Institutes for Quantum and Radiological Science and Technology (QST) [11,14].…”

Section: Performance Evaluation Of J-hbc Foilmentioning

confidence: 99%

“…Both foils were fabricated according to almost the same manufacturing methods and using the same deposition apparatus except for the vacuum device treatment. These trace impurities are considered to mainly contaminate from the boron-doped electrode [11]. As a consequence, we will investigate the quantitative evaluation of the trace impurities depending on the arc-discharge condition.…”

Section: Identification Of Trace Impurities By µPixementioning

confidence: 99%

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Progress status in fabrication of HBC stripper foil for 3-GeV RCS at J-PARC in Tokai site

et al. 2020

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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.

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Section: Manufacturing Process Of Hbc Foilsmentioning

confidence: 99%

Section: Performance Evaluation Of J-hbc Foilmentioning

confidence: 99%

Section: Identification Of Trace Impurities By µPixementioning

confidence: 99%

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Progress status in fabrication of HBC stripper foil for 3-GeV RCS at J-PARC in Tokai site

et al. 2020

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“…Be-7 was produced from carbon or boron in the HBC foil. Na-22 in the area was produced from Al contamination in the foil or the 7 µm SiC fibers that supported the stripper foil [12]. By contrast, the only radionuclide on the frame was Na-22.…”

Section: Identifying Nuclides On Stripper Foilmentioning

confidence: 99%

Measurement of radioactivity and evaluation of activated nuclides due to secondary particles produced in stripper foil in J-PARC RCS

2020

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Multi-turn charge-exchange beam injection is the key technique to achieve high-intensity proton beam accelerators. In J-PARC RCS, 400-MeV H- beams from LINAC are injected into stripper foils such that most of the beams are converted into protons. The stripper foils are irradiated not only with the injected H- beams but also with the protons circulating during the beam injection period. The high energy and intense beam irradiation into the foil generates secondary neutrons and protons via nuclear reactions. These secondary particles cause high residual activation around the stripper foils. Therefore, an activation analysis method that uses sample pieces is required to investigate the secondary particle. Furthermore, a new experimental system to measure secondary particles from the foil was installed at the L3BT 100BD line. Initial testing of the system has been completed, and beam testing will commence in October 2018.

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“…Several beam studies have been conducted to examine the characteristics of HBC foils. These include stripping efficiency measurement and long-term observation with an H − beam in J-PARC RCS [2,3], foil analysis by means of Rutherford backscattering spectrometry and particle induced X-ray emission, and scanning electron microscope and transmission electron microscope (TEM) observation after ion beam irradiation in Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) of National Institutes for Quantum and Radiological Science and Technology (QST) [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of J-HBC Stripper Foil for the J-PARC RCS

Yoshimoto

Nakanoya

Yamazaki

et al. 2021

Proceedings of the 3rd J-Parc Symposium (J-Parc2019)

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Japan Proton Accelerator Complex (J-PARC) 3-GeV Rapid Cycling Synchrotron (RCS) adopts the Hybrid type Boron-doped Carbon (HBC) stripper foil, which was developed in the High Energy Accelerator Research Organization (KEK) to improve the lifetime. Recently, the deposition apparatus for the HBC foils has been relocated from the KEK Tsukuba-site to the Japan Atomic Energy Agency (JAEA) Tokai-site, where a new foil called J-HBC foil, has been fabricated since 2017. Because deposition parameters between the original HBC foil and the J-HBC foil are different, the performance of the latter was evaluated against the former by ion beam bombardment in the Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) of the National Institutes for Quantum and Radiological Science and Technology (QST) laboratory. The experiments revealed that the J-HBC foil has similar toughness to the original one. Therefore, the authors of this study have stared utilizing the the J-HBC foil for the user operation in J-PARC.

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Analyses and the effect of impurities contained in charge stripper foils for the 3-GeV RCS of J-PARC

Cited by 7 publications

References 5 publications

Progress status in fabrication of HBC stripper foil for 3-GeV RCS at J-PARC in Tokai site

Progress status in fabrication of HBC stripper foil for 3-GeV RCS at J-PARC in Tokai site

Measurement of radioactivity and evaluation of activated nuclides due to secondary particles produced in stripper foil in J-PARC RCS

Analysis of J-HBC Stripper Foil for the J-PARC RCS

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