Development of Alumina Ceramics Vacuum Chamber for J-PARC

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  We successfully developed alumina ceramics vacuum chamber for the 3 GeV-RCS of J-PARC at JAEA. This chamber has titanium flanges and an outer RF shield to reduce duct impedance, and moreover TiN film is coated on the inside surface to preclude charge build up and to reduce secondary emitted electrons. The outgassing rate of the ceramics chamber measured by the conductance modulation method has a sufficiently low value of 1.2×10<sup>-8</sup> Pa m<sup>3</sup> s<sup>-1</sup> m<sup>2</sup> after 50 hours pumping. The temperature of the titanium flange became 45°C due to eddy current heating under dipole magnet operation. It was found that the radiation damage to the capacitor used for the RF shield of this duct was small, the capacitance only decreased by 7% after gamma ray irradiation of 30 MGy. In order to determine effect of the ceramics chamber on the proton beam, this ceramics chamber prepared for J-PARC was installed instead in the 12 GeV main ring at KEK-PS. The proton beam could be controlled to accelerate stably after installation, and thus it was found that this chamber did not influence the beam very much. This ceramics chamber is thus usable for the 3 GeV-RCS of J-PARC.<br>

収録刊行物

  • 真空  

    真空 49(12), 728-733, 2006-12-20 

    The Vacuum Society of Japan

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各種コード

  • NII論文ID(NAID)
    10018457575
  • NII書誌ID(NCID)
    AN00119871
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05598516
  • NDL 記事登録ID
    8624096
  • NDL 雑誌分類
    ZN15(科学技術--機械工学・工業--流体機械)
  • NDL 請求記号
    Z16-474
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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