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Report on SRF Work-packages 7 - 11. WP7 Power Couplers WP8 Tuners WP9 Low level RF WP10 Horizontal Cryostat Integration WP11 Beam Diagnostics. Power Couplers. Task 7.1 New proto-types “All-brazed” couplers received from CPI following TiN coating (just last week).

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Report on SRF Work-packages 7 - 11


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    1. Report on SRF Work-packages 7 - 11 WP7 Power Couplers WP8 Tuners WP9 Low level RF WP10 Horizontal Cryostat Integration WP11 Beam Diagnostics CARE SC meeting, CERN, 13th September, 2006.

    2. Power Couplers • Task 7.1 New proto-types • “All-brazed” couplers received from CPI following TiN coating (just last week). • 2 TTF-V couplers received prior to summer vacation. Not centered on 1300 MHz! S11 is only 11 dB. • Second pair of TTF-V couplers had window coating problem. They will be re-coated. CARE SC meeting, CERN, 13th September, 2006.

    3. Top right: TTF-V window Top left: TW60 window Bottom: Wave-guide test box. Insufficient TiN coating CARE SC meeting, CERN, 13th September, 2006.

    4. Power Couplers Task 7.2 Construction of TiN coating Bench Contract signed with Italian company for construction of bench. Delivery ~ July 2007. Based on magnetron sputtering under vacuum. Tests have been performed on TiN samples coated on an alumina substrate to verify the chemical composition. CARE SC meeting, CERN, 13th September, 2006.

    5. Power Couplers Task 7.3: Coupler Conditioning Studies RF power as a function of time for different pulse widths. Electron activity as a function of RF power and pulse width. CARE SC meeting, CERN, 13th September, 2006.

    6. Power Couplers CARE SC meeting, CERN, 13th September, 2006.

    7. WP7 schedule CARE SC meeting, CERN, 13th September, 2006.

    8. CARE SC meeting, CERN, 13th September, 2006.

    9. Task 9.1-Transient detector connected in ACC1 Electronics improved to allow un-interrupted operation. Task-9.2.2 On-line radiation monitor installed Low Level RF No report from Work-package leader !!! CARE SC meeting, CERN, 13th September, 2006.

    10. Cryostat Integration Tests CryHoLab being shipped to main Saclay site in summer of this year. Seven months needed to be operational again. CARE SC meeting, CERN, 13th September, 2006.

    11. Modification needed for cavity flange WP10 Schedule CARE SC meeting, CERN, 13th September, 2006.

    12. Re-entrant BPM Tests at DESY – August 2006 BPM 14ACC7 ‘BPM DESY’ CARE SC meeting, CERN, 13th September, 2006.

    13. Summary of BPM tests in August 2006 – 1/2 • Good linearity • Apparent lack of symmetry • Maybe due to steering magnets (saturation, residual field) ?? CARE SC meeting, CERN, 13th September, 2006.

    14. Summary of BPM tests in August 2006 - 2/2 • RMS resolution: ~ 40 µm (depending on beam jitter) • Theoretical resolution: 15 µm • Aim to improve the resolution while maintaining the dynamci range • Remove attenuators (~ -3 dB) ---> resolution <10µm (in theory) • Change the power mixer (input RF power ~ 16 dBm) ---> resolution < 1 µm (theoretically) CARE SC meeting, CERN, 13th September, 2006.

    15. Status of HOM Activity at FLASH • Cavity relative misalignments measured in ACC4 and ACC5 • BPM-like resolution measured around 10 µm for position and 200 µrad for angle • Thesis of Rita Paparella finished, examination on September 22. • Journal publication submitted collectively to PRST-AB, this month. Residual of the x offset prediction using the HOM analysis for cavity #5 in module #5. CARE SC meeting, CERN, 13th September, 2006.

    16. Summary of BPM tests in August 2006 CARE SC meeting, CERN, 13th September, 2006.