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UKNF RF: Status

UKNF RF: Status. Rebecca Seviour. Cockcroft Institute (Dept. Engineering, Lancaster University, UK). January 2007. Objectives. Complement the US research programme Investigate surface topology & Chemistry How preparation effect topology & Chemistry Try to determine reproducibility

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UKNF RF: Status

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  1. UKNF RF: Status Rebecca Seviour Cockcroft Institute (Dept. Engineering, Lancaster University, UK) January 2007

  2. Objectives • Complement the US research programme • Investigate surface topology & Chemistry • How preparation effect topology & Chemistry • Try to determine reproducibility • Try to determine which dominates performance • Investigate alternatives to Electropolishing • Modularised approach

  3. Junji Urakawa KEK; Roland Garoby CERN; Ilan Ben-Zvi BNL; F. Willeke DESY …… positively impressed by the systematic and scientific approach … considers [this activity] to be very important it deserves continuous and increasing support.

  4. Status • WP4 – still waiting decision • FP7 – CERN SCRF Facility • - SCRF Research (CARE) • - Novel Acc Systems • - MUON Cooling • UK NF RF Collaboration (Establishing) • - Cockcroft/ IC/ Brunel

  5. UK NF RF Collaboration • Shell Manufacture • - OFHC Cu Spec 101 vs 103 !! • - fabrication Technique • - Spining • - Hydroforming • - Welding • - EBW • - TiG • - Laser Welding • - Position of Weld • Port pulling • Tuning system • Cooling • Surface Prep & characterisation • - Electropolishing • - Different chemical Specs • Auger • Develop statistical map of impurities • Topology Mapping (AFM) • Develop statistical map of defects

  6. (Defects) (Shape/Defects/Surface) (Defects/Surface) Elctropolishing

  7. 201 MHz CavitySimulation

  8. Issues:Quality of E Beam weld EB vs TIG

  9. Issues:Surface Finish Plasma Spots Workshop on High Gradient RFArgonne National LaboratoryOctober 7-9, 2003 Field Emission (2004) Hot Spots Cracking

  10. Heat Exchanger Pump (0-1 L/min) (Need) Electro Polishing DC Supply (0-32 V, 0-300 A, ripple ~35 mV (rms)) (Need) + R. Rimmer, and own mix

  11. Rinse Currently just going to try deionised filtered water

  12. Electro Polishing Issues

  13. Clean Room Assembly Class 100

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