aec 09 session 1 motivation e cloud beam observations simulations coating requirements
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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

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

d iscussion points
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

slide3

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?
slide4

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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