October 21, 2005
Jonathan Dorfan, Director
(Photo by Diana Rogers)
By Jonathan Dorfan
Bravo PEP-II and BABAR!
The B Factory—PEP-II and BABAR—is "enjoying" a welcome four-week
"rest" after a highly successful first leg of Run 5. The second leg will
commence on November 11, 2005 and run through to late Summer 2006. By
then, BABAR expects to have doubled the total data sample logged from
late 1999 to the Summer of 2004.
In its last week of running before the current shutdown, PEP-II flexed
its mighty muscles and broke performance record after performance
record. Ever thirsty for more data, BABAR scooped up every event that
PEP-II delivered, likewise breaking its all-time records. Sensing the
impending shutdown, on October 8 and 9, PEP-II broke through the peak
luminosity barrier of 1034 cm-1 sec-1
on three separate occasions. Not to be outdone, BABAR logged data on
each of the three historic occasions. In achieving 1034 cm-1
sec-1, PEP-II set a world record for stored positron current
of 2.995 amps! In that same week, both PEP-II and BABAR broke their
all-time single shift and 24-hour integrated luminosity records. PEP-II
was designed to deliver 120 pb-1 per day (and that was
considered highly optimistic)—on October 7th, it delivered 728 pb-1!
With each new high-water mark, the excitement in the two control rooms
was electric; never before have I seen so many beaming faces at the
daily 8am meeting as on Monday October 10th. What a spectacular birthday
present it was for me!
You might have imagined that the protracted post-accident shutdown and
the once-in-forty-three-year, three-day power outage shortly after
turn-on would have dampened the spirits and enthusiasm of the SLAC
staff. But the tremendous achievements of the B Factory. are testament
to the fortitude, dedication, talent and pride of the SLAC staff.
Congratulations to you all—those in the PEP-II group, the BABAR Group,
Linac and PEP-II Operations, the extensive engineering and technical
staff that maintain the facility. In a very real sense, everyone at SLAC
owns this victory and you should each feel pride at these achievements.
And I know that you are not done with setting new standards—I look
forward with excitement to November 11 when we once again commence
While BABAR adds more fresh data to its stockpile, the collaboration
keeps pumping out new and often surprising, results on the data logged
through Summer 2004. So far this year, they have published over 60
journal articles – remarkably that is more than one publication per
week! Never before have I witnessed such an outpouring of high energy
physics results, all of it of outstanding quality, including several new
discoveries. With twice the data anticipated by next Summer, we can look
forward to yet another round of new revelations.
Bravo PEP-II and BABAR!
The Stanford Linear Accelerator Center is
managed by Stanford University for the
US Department of Energy
Wednesday November 30, 2005 by