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Superconducting Cavities Preparation & Testing – Draft for BCD

Superconducting Cavities Preparation & Testing – Draft for BCD. Lutz.Lilje@desy.de DESY -MPY- Snowmass 2005 Description of Cavity Preparation Basic steps BCD proposal for Cavity Preparation Process Disclaimer: This assumes the the material BCD choice: fine grain material

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Superconducting Cavities Preparation & Testing – Draft for BCD

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  1. Superconducting CavitiesPreparation & Testing – Draft for BCD Lutz.Lilje@desy.de DESY -MPY- Snowmass 2005 Description of Cavity Preparation Basic steps BCD proposal for Cavity Preparation Process Disclaimer: This assumes the the material BCD choice: fine grain material For large-grain material choice might change (see materials section) Lutz Lilje

  2. General Requirements - Overview • The preparation of the cavities should finally result in fully assembled cavities (incl. power coupler to) which are ready for string assembly. • After delivery from the welder, several things are to be done: • Mechanical checks, inspection • Frequency tuning • Cleaning • Damage layer removal • Furnace treatments • Final frequency tuning • Final surface preparation • Final cleaning • Bake-out at 120-130°C • Low-power acceptance test • Tank-welding • Assembly for high power operation • High-power test • Although all these steps need improvements in QA/QC for a mass production, the most challenging one is to define final (electro-)chemical surface preparation to deliver a reliable and reproducible performance. • The overall workflow needs optimization. Lutz Lilje

  3. Agreed High Priority R&D Issues • Field emission control is the major R&D issue • Field emission is the major source for a large performance spread of cavities • Quality control issues for surface preparation needs a major effort • E.g. acid quality control • Surface quality after several preparation steps needs to be controlled • Roughness control before final EP • Rinsing procedures need quality control • E.g. online-monitoring of particles in water from water draining out of the cavity • Reduction of cross-contamination due to integration of quality control steps (e.g. frequency tuning) inside the cleanroom • Mass production issues for many steps need work • Basic R&D needed for understanding ‘recipes‘ that work: e.g. Bakeout etc. Lutz Lilje

  4. BCD Proposal • Hottest topics • Damage layer Removal • BCD: Electropolishing (EP) • ACD 1: Mechanical Grinding + small etch or EP • ACD 2: Etch • Furnace treatment • BCD: 800°C • ACD: 1400°C • Final surface preparation • BCD: EP • Final cleaning • BCD: High Pressure Rinsing with ultra-pure water • ACD 1: Dry-ice cleaning • ACD 2: Megasonic rinsing • Bakeout • BCD: ‘In-situ‘ bakeout 120 • ACD: Air bakeout as part of the drying process Lutz Lilje

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