run status

From: Flemming Videbaek (videbaek@sgs1.hirg.bnl.goV)
Date: Mon Nov 19 2001 - 20:37:04 EST

  • Next message: Michael Murray: "Re: run status" 

    The weekend was did not supply us with lots of beam, but never the less progress has been made toward the high statistics goals
for the 12 deg  and the 90 degree high pt running. So far we have about 2M trigger 6 for 2/3 filed a-polarity at 12 deg and  1.6M at 90 deg.
The MRS was moved forward to the default position around noon today (D5 at 195 cm) . This will increase the solid angle by ~30% .
If the program continues in the average fashion we will probably get around 5M more triggers in the next day, not quite enough to met the
high pt goal we had hoped for.

I regard to the 22 GeV running the proposal for running is
- change ZDC HV to accomodate for lower gain. Since the beam will not be rebunched just take data with trigger 1 i.e. BB(L) BB(R) coinc.
this has a resonmable effeciency, but will clearly drop off for less central coll. I attach a simulation for 22 GeV Hijing hit multiplicity for
central BBL and BBr. The #hits is ~1/3 at 200 geV, but do also have wider fluctuations. Never the less it looks resonable efficient for
those collisions.

regards
    Flamming
------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory

tlf: 631-344-4106
fax 631-344-1334
e-mail: videbaek@bnl.gov
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