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Comparison of Yields of C, CN and TiN Next liners for SPS Lab system for SEY

Progress on coatings. Comparison of Yields of C, CN and TiN Next liners for SPS Lab system for SEY. S.Calatroni, P.Chiggiato, P.Costa Pinto, M.Taborelli. Liners for SPS: 1) TiZrV liner: ready 2) Low SEY coatings: TiN liner: ready C liner: ready by end of the week. TiZrV liner. 12. 0.

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Comparison of Yields of C, CN and TiN Next liners for SPS Lab system for SEY

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  1. Progress on coatings Comparison of Yields of C, CN and TiN Next liners for SPS Lab system for SEY S.Calatroni, P.Chiggiato, P.Costa Pinto, M.Taborelli

  2. Liners for SPS: 1) TiZrV liner: ready 2) Low SEY coatings: TiN liner: ready C liner: ready by end of the week

  3. TiZrV liner 12 0

  4. Trials for measurement of SEY of Cu on old AES system with +50V,-20V sample bias) : comparison with existing CERN data at 500eV and 700eV, (dose below 10-6 Clb/mm2) Hil= data from H.Hilleret The aim is to get relative ranking of samples, not the precise SEY values

  5. Ranking of coatings: measurements by AES system at CERN and true SEY in Madrid Ma=data from Madrid group

  6. Continuous beam, charging, SEY=1.22 Pulsed beam, no charging SEY=1.57

  7. 1) Problems with the CN : • Resistance measured with 4 points method 5MOHm□ • Estimated contact resistance of the pins as high as GOHm • Bad adhesion observed on StSt • 2) Ranking of SEY: • TiN > CN (present trial) > C • C coating is the best candidate: • No problems of charging • No problems of adhesion observed so far • Coating is compact (SEM images), probably amorphous carbon • SEY = 1.36 after 10 days in air, without conditioning

  8. C coating on Cu

  9. Status of lab measurement system • e-gun presently under commissioning (programming routines) • Vacuum chamber installed, but not connected to XPS yet • Collector system to be manufactured

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