From: Flemming Videbaek (videbaek@rcf.rhic.bnl.gov)
Date: Tue Apr 29 2003 - 20:10:27 EDT
With A.Drees as the interim scheduling physicist I actually get some
frequent information I can forward to you. The essence is the same as the
minutes from this morning 8.30 meeting, but with a slightly ifferent angle.
regards
Flemming
"
Hey there,
(I know, I know, you'll say: tell me something new ;))
yesterday the rotator ramp was tuned such that 6x6 beams had very good
transmission (talking intensity, not polarization) :). However, during
the night we had problems with 55x55 beam survival in the earlier
beta-squeeze part of the ramp already. Today the spin tune in yellow was
moved by about 0.01-.02 giving more room for tune swings without
polarization loss during the ramp. So far we got up to 20% (yellow) and
40% (blue) polarization with 6x6 beams and rotators on (compared to
almost 40% in blue and 32% in yellow with 55x55 and the wrong rotator
polarity last Friday). At this point we are working on maintaining
polarization up the first part of the ramp (enegy & squeeze) with 55x55
beams (well, and then of course during the rotator ramp ;)).
The source maintenance is planned to happen 'behind' any RHIC store,
preferrably one started Thursday early morning to profit from the 3-4 h
access. At this point it is not planned to prolong the access for it.
Due to the tight schedule there will be no access to any other machine
but RHIC.
Enjoy the spring weather (if you can) :)
Angelika
--
Flemming Videbaek
Brookhaven National Laboratory
Physics Department
tlf 631-344-4106
fax 631-344-1334
e-mail: videbaek@bnl.gov
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