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Mitsunobu - Status of KEKB EP System
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Mitsunobu - Status of KEKB EP System


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Status of KEKB Electropolishing system (Shinji Mitsunobu - 15')
Speaker: Shinji Mitsunobu - KEK Tsukuba-Shi Ibaraki-Ken Japan | Duration: 15 min.
Long time KEK superconducting cavities were treated by electro polish at Nomura plating Co.. For developing more reliable EP for ILC SC cavity,KEK decided to construct in-house new EP system. One L-band system and one universal system for 500 MHz and L-band system are gathered in one place.
L-band system have been used routinely ILC cavities EP successfully.
Anther new EP system for 500 MHz KEKB SC cavity have been constructed. KEKB test cavity was successfully processed.

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  • 1. Status of KEKB EP System S.Mitsunobu,Y.Funahashi,T.Furuya,A. Kabe,Y. Morita,M. Nishiwaki, M. Sawabe,S. Takano and K.Ueno KEK
  • 2. New EP system
    • KEK SC cavities were processed by Electro Polish at Nomura Plating Co..
    • For more reliable EP for ILC cavity, KEK decided to have in-house new EP system.
    • One L-band system and universal system for 500 MHz and L band system are gathered in one place.
    • 500 MHz system reuse old one as possible and move from Nomura to KEK.
  • 3. Conceptual drawing of EP (Proff.Kojima’s car battery) Teflon
  • 4. Vertical EP Furuya et al
  • 5. Saito et al
  • 6.  
  • 7. KEKB Superconducting Cavity
  • 8. Nb Cavity
  • 9. Rotating Equipment for EP at Nomura Plating Co. 超伝導空洞の電解研磨
  • 10. New EP bed at KEK
  • 11. First test using TRISTAN Single Cell (TM110 mode test)
  • 12. Ultrasonic tank and shower tank
  • 13. New acid tank (500 L)
  • 14. New EP area
  • 15. Acid gas cleaning system
  • 16. Modification
    • Automatic controlling system
    • Separating Heat Exchanger
    • Exchange Z- seal
    • Move air intake valve on rotational Joint
    • Add Water over flow pipe
    • Add Butterfly type valves over flow line
  • 17.  
  • 18. EP condition
    • Acid Temperature 20~30 degC
    • Cathode Voltage -20 ~ -30 V
    • Current density 30~50mA(EP1>EP2)
    • Acid flow rate 40L/min
    • 10 mm over center
    • KEKB cavity use O3 rinsing
  • 19.  
  • 20. 4 bar shower rinsing O 3 rinsing Hotwater and U sonic rinsing
  • 21.  
  • 22. Conclusion of New EP system
    • New EP system has been constructed in KEK.
    • KEKB Test cavity was successfully treated by new EP system.
    • KEKB Test Cavity reached Eacc>12.7MV/m.
    • Three NSRRC KEKB Type cavities will use this EP system next year.
    • L-band cavity and crab cavity(CERN upgrade) also can be use this system by small modification.