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Stimulating a discussion on cavity performance metrics

Stimulating a discussion on cavity performance metrics. Outline. Of corse , we start from the functional specification, then we add some details and criteria on: Beam Physics SRF Design and performance Safety and Integration Planning Other Fully dressed cavities. Beam Physics.

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Stimulating a discussion on cavity performance metrics

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  1. Stimulating a discussion on cavity performance metrics

  2. Outline • Of corse, we start from the functional specification, then we add some details and criteriaon: • Beam Physics • SRF Design and performance • Safety and Integration • Planning • Other • Fully dressed cavities

  3. Beam Physics • Impedance + HOMs • HOM location addressing specific dangerous frequencies • Specify beam spectrum and power associated • Two main threatening modes • Acceptable impedance after damping • Gradient/kick • Margin over gradient • R_s x R_t • Margin over spec and reproducibility • Robustness on fabrication errors • Multipoles – field uniformity • A mix of measurements and calculations • Aperture

  4. SRF design • Max electric and magnetic field • Cryogenic load and heat rejection • Lorentz detuning parameter • Material qualification • Tuning • Mfg, leak test, vacuum level

  5. SRF performance • Multipacting + conditioning • Field emission • Margins for reliability • Quench level above operating gradient • Trip rates • beam induced

  6. Safety and Integration • Pressure vessel requirements • Machine protection • Size and interfaces • Modularity • LHC implementation • Does not preclude LHC implementation • Ie. Bare cavity should be useable in H or V

  7. Planning • Schedule, cost, risk • ease of manufacturing • Ease of processing • Technical complexity • Material choice

  8. Questions and comments • Do we weigh these, how? • Do some have 'veto power'…? • Must meet spec • Limit for now to SPS installation? • But not preclude LHC implementation

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