Page History

1176 

tagged g

3GeV

 600

BT1

0 degrees, center of tower 2

yes 

events in twr3?

 1177-1180

tagged g

e beam at 2.5GeV

 600

BT1

0 degrees, center of tower 2

yes

magnet ON, 25K evts per run 

 1206

 tagged gamma

e-  1GeV

 240

 S0:14k count per spill
HW trg: 100 count per spill
DAQ trg: 100 count per spill
Lot of 0 cluster in chamber 2 and 3, we need to tune the bending magnet and/or improve the veto to select a small spot.

 1207

 11/8

 idem with S1 in the trigger
this run is to see if the zero that we see is a trigger or magner problem:

• it seem that it's a trigger issue: now the fraction of zero seems similar to what we saw in the other physics runs.
  S0: 14 k count
  HW & DAQ trg :20 counts
  

 1208

11/8 11h34

 e-
1 GeV

 240

   New trigger S3 in veto 
count per spill:
S0: 12k
HW: 50
DAQ: 60

 1209

 11/8
13h29 

 e-
1GeV

 Slits position changed from 51.5 to 52: S0 rate passed form 14 kCount to 20 kCount per spill. good tagged run with 1GeV beam.
trigger counts per spill (2 spill per cycle):
S0: 20k
HW: 80
DAQ: 70
  around 30k : SYNCHRONIZATION LOST !
stopping the run, first 30000 events should well sycnhronized...
for the event for which the synchronization was lost the DeltaEventTime was 128s that is corresponding to the turnover of the 2nd GASU counter. ||

1210 

 11/8

 Synchronized Tagged gamma with 1GeV electron beam, going for 70k to get all the statistic
+ beam intensity is very low : DAQ rate ~ 15events/spill and S0 ~ 2700events/spill
+ after 12k : we have 3 spills taking ~200 events per super cycle

1183-1190

 8/8
9/8 

e+g

2.5

 600

BT1

0 degrees, center of tower 2

yes 

overall 2M evts  - (false report of 300 A for 1185 in elogBook)