Development of the Radiation-hardened Magnetically Suspended Compound Molecular Pump

Wada, Kenta; Inohara, Takashi; Iguchi, Masashi; Ogiwara, Norio; Mio, Keigo; Nakayama, Hironori

doi:10.3131/jvsj.50.452

Cited by 4 publications

(2 citation statements)

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“…4) Outgassing of the vacuum components should be minimized, and a continuously high pumping speed should be ensured over a wide range of pressures. New vacuum components such as turbo molecular pumps with radiation toughness 3) , large-scale alumina ceramic beam pipes 4) , large-scale titanium bellows 2) , large-scale metal seals 5) , and cables and connectors with radioactive resistance 6) were developed on the basis of these design concepts. Simultaneously, treatments such as surface polishing and vacuumˆring 2) of vacuum materials to suppress outgassing were performed.…”

Section: Design Concept Of the J-parc Rcs Vacuum Systemmentioning

confidence: 99%

“…The TiN coating also helps to decrease outgassing by suppressing the adsorption of gas molecules. Turbo molecular pump with high resistance to radioactivity A turbo molecular pump with high resistance to radioactivity was developed based on a standard magnetically suspended turbo molecular pump TG1300M (provided by Osaka Vacuum, Ltd.) 3) . This standard model had no semiconductor devices in its body and was constructed only of metals.…”

Section: Alumina Ceramic Beam Pipes With Large Aperturementioning

confidence: 99%

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Vacuum Technologies in High-Power Proton Accelerators

Kamiya

2016

J. Vac. Soc. Jpn.

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For vacuum systems in high-power proton accelerators, compared with those in conventional particle accelerators, there are more challenging requirements in addition to their basic role owing to the existence of a large number of high-energy protons, rapid cycling of the magneticˆeld, and high radioactivation. In addition, it is necessary to promptly evacuate from the atmospheric pressure to ultra-high vacuum (UHV) and ensure su‹cient pumping speed against an additional gas load because of the desorption of ion-induced molecules from the vacuum wall. The vacuum system of the 3 GeV Rapid Cycling Synchrotron (RCS) at the Japan Proton Accelerator Research Complex fulˆlls such unique requirements of high-power proton accelerators. Many vacuum devices such as turbo molecular pumps with radiation toughness, beam pipes made of alumina ceramics, and titanium beam pipes and bellows were developed in accordance with the design concept of the system. Treatments to minimize both static and dynamic outgassing were also performed, e.g., surface polishing, coating, and vacuumˆring. With regard to the performance of the entire vacuum system, rapid evacuation from atmospheric pressure and assurance of UHV during beam operation have been achieved. Responding to the upgradation of the beam power, continuous improvements of the vacuum system have been performed, e.g., beam loss reduction by improving the beam line pressure, in-situ degassing of the kicker magnet, and magnetic shielding via beam pipes and bellows made of soft magnetic material. This report presents vacuum technologies typically used in high-power proton beam accelerators considering the design concept of the RCS vacuum system, developed components, vacuum performance, and recent upgrades. 18 214-()-J. Vac. Soc. Jpn.

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Section: Design Concept Of the J-parc Rcs Vacuum Systemmentioning

confidence: 99%

Section: Alumina Ceramic Beam Pipes With Large Aperturementioning

confidence: 99%