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Status of Cathode System in FZR

Status of Cathode System in FZR. Photocathode preparation and test of the cathode cooling system. Rong Xiang FZ Rossendorf, Dresden. Cathode System in SRF Project. Preparation chamber Transport chamber Cathode cooling system. What we need ?. Preparation Chamber. Design Manufacture

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Status of Cathode System in FZR

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  1. Status of Cathode System in FZR Photocathode preparation and test of the cathode cooling system Rong Xiang FZ Rossendorf, Dresden

  2. Cathode System in SRF Project • Preparation chamber • Transport chamber • Cathode cooling system

  3. What we need ?

  4. Preparation Chamber • Design • Manufacture • First test, optimize • Clean room building • Clean • Assemble • Experiment • Production (July 2006)

  5. Preparation System shutter rate monitors evaporators laser light ports cathode • Ultra high vacuum (10-11 ~ 10-9 mbar ) • Cathode holding Halogen-light heating Ion-beam cleaning • Co-evaporation of Te and Cs • Measurment of quantum efficiency QE during deposition Life time Distribution scan

  6. pressure spring bayonet fixing cone for positioning & thermal contact Ø10 mm Cs2Te Cathode plug Cathode plugs are made of Cu or Mo Manual Polishing result: average roughness: 17.2 nm (analyzed by Dektak8 profiler)

  7. Control system Control program “SRFgun” Quartz thickness monitor STM-1

  8. Co-evaporation NCs 2 = R= NTe 1 Calibration Te, Cs separate Preparation Stoichiometric

  9. First test in new chamber

  10. Our homepage http://www.fz-rossendorf.de/projects/CARE/

  11. 2. Transport Chamber cathode transfer root linear & rotation places for 6 cathodes transportation chamber exchange chamber • Design • Manufacture • First test, optimize • Clean • Assemble

  12. Minimum particle generation during exchange Six cathodes can be stored and transferred Accurate adjustment

  13. 3. Cathode cooling system cathode cooler LN2 reservoir cathode • Design • Manufacture • First test, optimize • Final assemble

  14. Test of the cathode cooling system Measured temperatures via power input 30 W power input to the photo cathode burdens the cavity with only 31 mW. (F. Staufenbiel, et al., SRF2005)

  15. Next work • Finish construction of preparation chamber (clean, assemble, vacuum…) • Solidify preparation technology (control, measure, calibrate…) • Finish the test of transport chamber (optimize, clean, vacuum, portable…)

  16. Thank you!

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