05/10/97 Update
05/10/97 Update
9:00 am Saturday May 10, 1997.
PEP-II commissioning is off to a terrific start. The approval for injection- line and ring operation was received at 10:30 pm Thursday May 8, 1997. Friday 12:30 am the stoppers at the front end of the injection line were removed and beam was diverted from the linac into the PEP-II electron transport line. At 2:30 am the beam was at the end of the transport line and at 3:30 am a second set of stoppers were removed to allow the beam to enter the high energy ring (HER) injection match line. (The match line is several hundred meters of newly installed, virgin beamline.) At 6 am the beam, with 80% transport efficiency, was recorded on a phosphorescent screen at the injection septum of the HER. This was accomplished without the use of match-line beam position monitors or correctors. At this point, there was a hiatus in the program to do some repair work on the damping ring.
The hiatus was over by about midnight Friday May 9. At 1:55 am Saturday May 10 the beam was back at the HER septum. The stoppers at the HER were opened and the beam was allowed to enter the ring. At 3:05 am the beam had gone around half the HER and a bright spot was recorded on a phosphorescent monitor at a dump in region 2. Again this was accomplished without the use of any corrector magnets, beam loss monitors or beam position monitors. The temporary dump in region 2 will be removed in the next two weeks after the last few HER co mponents are installed. This will allow us to proceed to stored beam operation. In the meantime, the diagnostics are being timed in and made operational.
This early success speaks volumes to the quality of the work which has been accomplished by the talented and dedicated personnel at SLAC, LBNL and LLNL. To "dead-reckon" the beam so successfully and in such short order is a magnificent feat. I wish to personally convey my enthusiastic congratulations and thanks to each and every one who contributed to this achievement -- this has truly been a team effort. It has involved people from the three laboratories, and from all the Divisions at SLAC. The dedication, adherence to the highest standards, and the long hours have paid off in the results of last 36 hours. I look forward to stored beam in the next few weeks.
Jonathan Dorfan
Suggestions to: John Seeman
[PEP-II Commissioning Updates] [PEP-II Home Page] [BABAR Detector Home Page] [SLAC Home Page]
Page owner: achan