THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY UKNF RF: Status Cockcroft Institute (Dept. Engineering, Lancaster University, UK) January.

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Presentation transcript:

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY UKNF RF: Status Cockcroft Institute (Dept. Engineering, Lancaster University, UK) January 2007 Rebecca Seviour

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY 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

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY …… positively impressed by the systematic and scientific approach … considers [this activity] to be very important it deserves continuous and increasing support. Junji Urakawa KEK; Roland Garoby CERN; Ilan Ben-ZviBNL; F. Willeke DESY

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY WP4 – still waiting decision FP7 – CERN SCRF Facility - SCRF Research (CARE) - Novel Acc Systems - MUON Cooling UK NF RF Collaboration (Establishing) - Cockcroft/ IC/ Brunel Status

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY 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

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY (Defects) (Defects/Surface) (Shape/Defects/Surface) Elctropolishing

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY 201 MHz Cavity Simulation

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY Issues: Quality of E Beam weld EB vs TIG

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY Plasma Spots Hot Spots (2004) Cracking Field Emission Workshop on High Gradient RF Argonne National Laboratory October 7-9, 2003 Issues: Surface Finish

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY Electro Polishing Pump (0-1 L/min) (Need) Heat Exchanger DC Supply (0-32 V, A, ripple ~35 mV (rms)) (Need) + R. Rimmer, and own mix

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY Currently just going to try deionised filtered water Rinse

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY Electro Polishing Issues

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY Clean Room Assembly Class 100

THE COCKCROFT INSTITUTE of ACCELERATOR SCIENCE and TECHNOLOGY

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