01/13/98 Update

PEP-II January Commissioning

Update on PEP-II Commissioning January 12, 1998.

PEP-II was turned on January 5 for a month long commissioning period. After the first week several goals have been reached:

Injection: David Schultz and the injection group have established both electron and positron beam pulses. The rate can be varied but PEP-II typically gets one Hertz each of electrons and positrons to the tuneup dumps in IR halls 10 and 8, respectively, even while SLC is making over 100 Zo per hour. They have also transported the positron beam to the end of the e+ injection line to the current sheet septum in the LER, the official separation point.

LER: Mike Zisman, Tom Elioff, Lowell Klaisner and the Low Energy Ring group have pumped down the first 90 m of the LER including 65 m of straight section 8 and the first three dipoles (25 m) in Arc 7. On January 9 the positron beam was injected and steered to a temporary beam stop at the end. The position monitors were timed and used on the first day. This event marks the first beam in the LER. Steering and calibration tests continue.

RF: Heinz Schwarz, Matt Allen, Paul Corredoura, and friends have commissioned five HER RF stations. All five stations have been running with full voltage simultaneously. Work now concentrates on providing the final touches to the RF feedback loops.

HER: Uli Wienands and the HER crew reestablished a stored beam by the morning of January 6. The new energy collimator has been commissioned and seems to trap off energy particles. The betatron functions around the ring, as seen in October to have significant errors, have been mostly fixed with small 0.5% changes to the strengths of the IR quadrupole doublet (Martin Donald, James Safranek, and Yunhai Cai). The synchrotron light monitor was recommissioned after work during the down and now has light transported upstairs for streak camera work later this week (Alan Fisher and Ralph Assmann). By yesterday a beam of 230 mA was stably stored with injection at 1 Hz. Work continues on the feedback loops and raising the beam current.

A good start!

Thanks to everyone for getting things together,

John Seeman

Suggestions to: John Seeman

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