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Investigating Surface Topology and Chemistry for Enhanced RF Cavity Performance at UKNF.RF

This research project at the Cockcroft Institute aims to complement the US research program by investigating surface topology and chemistry, focusing on the effects of preparation methods. Key objectives include determining reproducibility in performance, exploring alternatives to electropolishing, and utilizing a modularized approach to enhance superconducting radio frequency (SCRF) technologies. With impressive feedback from renowned institutions, the work seeks continuous support to improve cavity design through innovative fabrication techniques and thorough surface preparation methodologies.

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Investigating Surface Topology and Chemistry for Enhanced RF Cavity Performance at UKNF.RF

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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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