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ECLOUD Clearing Electrode and Detector

ECLOUD Clearing Electrode and Detector. X. Zhang, A. Chen, R. Stewart. Effects of Clearing Electrode. Preliminary Design. Kapton Insulation S.S. strip w. or w/o NEG coating. Clearing Electrode. Pros: Can suppress Ecloud efficiently; Easy to install in magnets than the coating;

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ECLOUD Clearing Electrode and Detector

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  1. ECLOUD Clearing Electrode and Detector X. Zhang, A. Chen, R. Stewart

  2. Effects of Clearing Electrode

  3. Preliminary Design Kapton Insulation S.S. strip w. or w/o NEG coating

  4. Clearing Electrode • Pros: • Can suppress Ecloud efficiently; • Easy to install in magnets than the coating; • No beam scrubing time needed; • Can be used as to improve vacuum (like Tevatron SNEG); • Can measure Ecloud density in magnets; • Cross check with microwave measurements; • Cons: • Impedance ? • Longevities?

  5. Electron Distributions

  6. CesrTARFAs in Magnets RFA – Grids and Collectors RFA Retarding Grids: Electroformed copper mesh (71 LPI, 15m WW, 13m THK) bonded to SST frames. T > 90%. 0.3 m gold ‘flashing’ to reduce SEY on the meshes RFA Electron Collectors: Printed flexible circuits, Cu-clad Kapton ribbons, UHV compatible, ~13m thick AVS 56th International Symposium, San Jose, CA

  7. CesrTARFAs in Magnets SC Wiggler RFA Structures • Unique design allowing RFA structures fit within 2.5 mm space • Significant efforts in design and tests to ensure survivability of the flexible circuit collector through welding steps • Lack of vacuum pumping and silicon contamination are issues to be addressed Grids nested in ceramic frames Collector pinned in AVS 56th International Symposium, San Jose, CA

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