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PEP-II Startup Progress Update and Challenges - January 2007

The PEP-II accelerator startup on January 14-15 showed promising results with beam currents reaching 260 mA on 130 mA max, and the HER achieving up to 185 mA. Follow-up actions outlined in the startup plan addressed several critical issues, including the failure of the QD4R power supply, which has since been fixed. Current efforts are focused on increasing beam currents, getting RF systems operational, and tuning luminosity. Although significant work has improved system functionality, unresolved technical issues pose challenges for further advances.

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PEP-II Startup Progress Update and Challenges - January 2007

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  1. PEP-II Startup & Plan • Stored beam Jan. 14,15 • 3 accesses required to fix problems • 260 on 130 mA max. so far, HER alone up to 185 mA • pk Lumi 0.1x1033 • Followed startup plan • orbit reasonable • lattice fctns reasonable • lifetime reasonable • Got HER TFB going • 4 HER Rf, 1 LER Rf • Began scrubbing U. Wienands, SLAC-PEP-II AP meeting, 16-Jan-07

  2. Major issues • QD4R power supply and spare ps both failed on turn-on • 3-day around-the-clock work by PCD eng. and tech. • QD4R now working on its InverPower supply • Spare DynaPower believed to be good • but cannot test beyond 300 A • Only limited number of Rf stations running • technical and PPS issues • will prevent further progress if not fixed soon. • BIC not operational • work-around with DIAGLIST • much better now after expert work over the weekend • LER IR-2 BPMs have not yet given much of a reading. U. Wienands, SLAC-PEP-II AP meeting, 16-Jan-07

  3. Plan • Priority to get beam currents up • Get LER TFB going (today), tune HER TFB (ongoing) • Get more Rf working (today, tomorrow) • Get LFBs going (Thu, Fri, Sat) • somewhat hinges on getting sufficient rf voltage • expert not available next week • Fix remaining magnet issues in LER tomorrow • SK3 has ground fault • SCX1L has intermittent ground fault. • Begin luminosity tuning tomorrow evening. • Scrub • Begin delivery coming weekend U. Wienands, SLAC-PEP-II AP meeting, 16-Jan-07

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