On Shift: JK,MO

Logbook #9 Pages 61,62

Energy: Psi' bkg-low (3666 MeV)
Typical Luminosity: 1.4x10^31 cm^-2 s^-1
Typical Beam Width: 0.7 MeV/c

Current at Beginning of Shift:  about 7.85 mA
Current at End of Shift:                 0 mA

Data summary:
Run    Integrated Luminosity
7281   195.4 nb^-1 stopped
7282    80.0 nb^-1 stopped
7283    20.8 nb^-1 stopped

TOT LUM at 3666 MeV = 727.4 nb^-1

Short summary of this last week if data taking

Ecm(MeV)   LUM_int(pb^-1)       psip**      inclusive psip**
3704         1.0856               62               29
3686         2.2524             7469             5407
3666*        0.6266               20               10

*Run 7280-7281
** psip : electron weight and acceptance cut
   
   inclusive psip : electron weight, acceptance and 
   prb_fit(psip-->psi X) cut

Comments:

7281 -->8:15 Mainframe 2-wedge 9 card seems to be drifting in voltage from
        -10V to -30V. We stop the run 7281 as soon as we found this problem.
7282 --> Straws HV test done (better not to use straws in analysis 
         for this run).       
     --> 11:00 unresettable DAQ hang. We did a drt_fresh_start and began a
         new run


Being that this is the last run, we performed a series of experiments such
as:
seeing how many kicks a DYC could take before failing,
hooking a jug of maple syrup to the hydrogen gas line, etc.

Thanks to everyone who made this run possible. Let the party begin.
Sincerely,
Jason, Margherita, Keith, Michelle, Giulio, Wander, Ted, Matt, Stephen.