• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name Peter L

    Log entry time 02:04:31 on June15,2004

    Entry number 125804

    keyword=Scanner runs note

    We began by ramping up our PMT's to previously decided mnominal
     voltages.  This was done in the high voltage panel leCroy HV. In the
     right arm bottom "slot 10 shower" channel 11  -> -1650V , Left arm
     "5th pion rejector" channel 11   ->  -1300V.
    
    Next we started a scan (run 2139)  at (17,57)(cm) and moved down to
     (17,10) ->(14,57)->(14,10)->(11,57)->(20,57)->(20,10)->(18.5,10)->(18.5,57)
    ->(15.5,57)->(15.5,10)->(12.5,10)->(12.5,57)->(11,10) then back to
     (17,57) for the next run.
    
    Run 2140 we cycled from (18,57) to (18,5) at different PMT voltages
     to avoid saturation in the  right arm.  We settled at -1550 in the
     right and -1400 in the left.  Events are as follows:
    
    right   run 2140
    1600V   9500->14000 events
    1550V   15000->18300 events
    1500V   18300->21700 events
    
    
    We decided that -1550V was the best and will therefore remain the nominal voltage for the right side.  Left we raised to -1400V.
    next entry will contain plots.