M sullivan and f j decker for the pep ii team machine advisory committee review november 15 17 2007
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Beam Current Limits at the end of Run 6. M. Sullivan and F-J Decker for the PEP-II Team Machine Advisory Committee Review November 15-17, 2007. HER Beam current.

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M sullivan and f j decker for the pep ii team machine advisory committee review november 15 17 2007

Beam Current Limits at the end of Run 6

M. Sullivan and F-J Decker

for the

PEP-II Team

Machine Advisory Committee Review

November 15-17, 2007


Her beam current
HER Beam current

  • In the middle of August we developed a vacuum leak in the upstream HER beam line from the detector. The leak closed when the beam was lost.

    • Limited the HER beam to 1775 mA

    • Then to 1800 mA

    • Gradually pumped out (virtual?) and was not a limit near the end of the run


Her beam current limit
HER beam current limit

  • About the same time we lost the power supply for LER RF station 4-3 and had to take the power supply of HER RF station 4-6.

    • Lowered the maximum possible HER beam current to 2 A.

  • At the end of August we were now running into record breaking territory and decided to not push too hard.

  • At the very end of the run HER RF station 12-1 had to be turned off due to vacuum problems and arcing

    • This limited the HER beam current to 1.8 A


Ler beam current
LER beam current

  • Throughout August the LER beam current stayed at about 2.6 A

  • We tried to push up the LER current in the latter part of August

    • Luminosity kept going down as the LER current went up (Decker’s talk)

  • We got up to about 2.75 A

    • Only briefly though and when we pushed the HER beam current up to 1.9 A

  • Tried an RF MD to try for 3 A

    • A fairly big jump in total beam current

    • RF system needed more tuning and processing


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