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.
Abstract
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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Mitsunobu - Status of KEKB EP System

  1. 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. 2. New EP system <ul><li>KEK SC cavities were processed by Electro Polish at Nomura Plating Co.. </li></ul><ul><li>For more reliable EP for ILC cavity, KEK decided to have in-house new EP system. </li></ul><ul><li>One L-band system and universal system for 500 MHz and L band system are gathered in one place. </li></ul><ul><li>500 MHz system reuse old one as possible and move from Nomura to KEK. </li></ul>
  3. 3. Conceptual drawing of EP (Proff.Kojima’s car battery) Teflon
  4. 4. Vertical EP Furuya et al
  5. 5. Saito et al
  6. 7. KEKB Superconducting Cavity
  7. 8. Nb Cavity
  8. 9. Rotating Equipment for EP at Nomura Plating Co. 超伝導空洞の電解研磨
  9. 10. New EP bed at KEK
  10. 11. First test using TRISTAN Single Cell (TM110 mode test)
  11. 12. Ultrasonic tank and shower tank
  12. 13. New acid tank (500 L)
  13. 14. New EP area
  14. 15. Acid gas cleaning system
  15. 16. Modification <ul><li>Automatic controlling system </li></ul><ul><li>Separating Heat Exchanger </li></ul><ul><li>Exchange Z- seal </li></ul><ul><li>Move air intake valve on rotational Joint </li></ul><ul><li>Add Water over flow pipe </li></ul><ul><li>Add Butterfly type valves over flow line </li></ul>
  16. 18. EP condition <ul><li>Acid Temperature 20~30 degC </li></ul><ul><li>Cathode Voltage -20 ~ -30 V </li></ul><ul><li>Current density 30~50mA(EP1>EP2) </li></ul><ul><li>Acid flow rate 40L/min </li></ul><ul><li>10 mm over center </li></ul><ul><li>KEKB cavity use O3 rinsing </li></ul>
  17. 20. 4 bar shower rinsing O 3 rinsing Hotwater and U sonic rinsing
  18. 22. Conclusion of New EP system <ul><li>New EP system has been constructed in KEK. </li></ul><ul><li>KEKB Test cavity was successfully treated by new EP system. </li></ul><ul><li>KEKB Test Cavity reached Eacc>12.7MV/m. </li></ul><ul><li>Three NSRRC KEKB Type cavities will use this EP system next year. </li></ul><ul><li>L-band cavity and crab cavity(CERN upgrade) also can be use this system by small modification. </li></ul>

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