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AEC’09 Session 1 Motivation, e-cloud Beam Observations & Simulations, Coating Requirements

AEC’09 Session 1 Motivation, e-cloud Beam Observations & Simulations, Coating Requirements. SPS ugrade plan, Elena Shaposhnikova Which SPS parts to be coated? Giovanni Rumolo J-PARC, Shigeki Kato SNS, Mike Plum Cesr -TA part 1, Mark Palmer Cesr -TA part 2, Jim Crittenden.

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AEC’09 Session 1 Motivation, e-cloud Beam Observations & Simulations, Coating Requirements

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  1. AEC’09 Session 1Motivation, e-cloud Beam Observations & Simulations, Coating Requirements SPS ugrade plan, Elena Shaposhnikova Which SPS parts to be coated? Giovanni Rumolo J-PARC, Shigeki Kato SNS, Mike Plum Cesr-TA part 1, Mark Palmer Cesr-TA part 2, Jim Crittenden

  2. discussion points • does TiN coating help? - not at all (SNS), a little (CESR-TA), a lot (PEP-II, KEKB) - J-PARC (no data yet), PSR – sometimes TiN helped - relative effect of scrubbing less strong for TiN - differences between e+ and e- at CESR-TA - benefit of TiN depends on bunch spacing & #bunches - SNS 3 years operation, no clear evidence for scrubbing in presence of controlled venting 2 or 3 times per year

  3. TE-wave measurements at cyclotron-resonance - handle with care! • how reliable are the predictions? • unexpected e-p instability at SNS, at 20% of design intensity with TiN coating, compared with predicted 130% w/o coating • SPS dump kicker with 50-ns bunch spacing? • FNAL MI e-cloud evolution during acceleration • SNS: effect of particles in gap? • SNS: problem with build up or with instability?

  4. SEY values after conditioning? • re-diffused component, “anti-dips” for TiN • mitigation by higher beam intensity • “magnetron effect” - CESR-TA experiment? • bremsstrahlung off beam protons

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