Shift Summary for  May 4th,2000  16:00-24:00
On Shift: GC, RM  
Log Book #7  pages 166-172

Run Summary:

5606  1P1 peak (3526.2)
      beginning current: 29.2 mA
      final current    : 26.6 mA
      total luminosity : 295.9 nb-1

5607  1P1 peak (3526.2)
      beginning current: 26.6 mA
      final current    : 25 mA
      total luminosity : 140.4 nb-1      (total so far 2.44 pb-1)

5608  1P1 peak (3526.2)
      beginning current: 24.7 mA
     This run was paused between 20:42 and 22:22, and is still under way.


Comments: 
Definitively NOT a smooth shift... 
Two major problems caused interruptions of the data taking

18:52  DAQ crashed because  one fn835y hard-disk stopped commnicating. 
            KEG,PR,GG came to help, the whole machine + SCSI interface + everything was 
            carefully re-initialized. The disk was not damaged, and it was possible to restart
            everything 1 hr later. 
            As a consequence of switching off the jet target, the beam energy drifted upwards 
            (up to .3 MeV). 

            Beam Energy dropped .4 MeV down in ~20 mins after restart.            

20:41   The new HV monitor program rapidly caught the decrease in HV (-700 V) of 16 CCAL 
            tubes (wedge 61, ch 1-16). GL was paged, and replaced both an HV card (taken from 
            PREP) and the mainframe 6  controller. Run 5608 was then resumed, after 1h40 min. 
            At restart of data taking, the Beam Energy was again .25 MeV above 3526.2 . 
            Martin Hu says we must expect a few oscillations before stabilizing.

Minor problems: 4 'standard' DAQ hangs.

Bombo & Gigi 

ps: the 8% increase in the GK/GN event ratio (mentioned in the meeting minutes), since yesterday,
 is correlated to  a ~10-15% drop in  CCAL related rates. A similar trend can be noticed also in 
previous chi-0 stacks.   

(expert guests: KEG, PR, GG, GL  when needed)