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 PowerPoint PPT Presentation


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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

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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


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

  • 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?


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

  • 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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