Following the time meeting today, there was a coordination meeting on Sunday run at 22 GeV. This is clearly driven by Phobos, but all experiment
voiced they would attempt to take data during this period.
- long discussion was on risks/benifits of beta*=3 setup.
-- This has not been done before and would likely require 1-2 hours setup, but with of course a gain of 3 in rate (over the default beta* of 10).
-- Decision was made to attempt this, and meet at 11.00 am Sunday (MCR conf rooom) to decide on action.
-- The rate of coll to background is clearly a matter of concern (a max coll rate of ~30 is expected) while the backgournd will be that from
a beam woith intensity ~ 45e09 i.e bigger by ~30% than normal 200 geV operating.
-- Exp will inform Todd (who will be around all of Sunday for coordinating effort) about alternateve scaler i.e. BB rel to ZDC for steerings
-- Beam life time will likely be in orde of 20(pessimistic) to 40 (optimistic) minutes neededing frequent injection
This raises issue of startup of HV, bias voltage time relative to running time.
The first ~ 2 hours 6-8 am will be spend on injection tuning after which collisions will be attempted.
The RC timing has to be changed due to the 'new' beta of the beam. Probaly moved by up to 40 nsec
The following people has agreed to be available for this attempt to look at 22 GeV in addition to the assigned shift people
M.Muarray, Ramiro and my self. A decision should be made on or about the 11 o'clock meeting if we opt in or out of the ramainder of the 24 hours
period. (Star clearly has problems with this - no BB trigger at all only central barrel).
regards
Flemming
Flemming
------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory
tlf: 631-344-4106
fax 631-344-1334
e-mail: videbaek@bnl.gov
This archive was generated by hypermail 2b30 : Tue Nov 20 2001 - 21:39:22 EST