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FGT data taking : Evening shift, February 12, 2012

Updated on Mon, 2012-02-13 07:28. Originally created by surrow on 2012-02-13 07:09.

Summary of FGT data taking : Evening shift, February 12, 2012:

a) New HV configuration file: Set 3

The FGT evening shift started with preparing a new HV file following Jan's second analysis raising the HV for a selected group of channels by 100V. The new list is shown below:  

Module      Channel      Quarter section         New HV (02/11/2012)     New HV (02/12/2012)


0               u0              1A                          3200                              3300
0               u1              1B                          3300                              3300
0               u2              1C                          3250                              3350
0               u3              1D                          3400                              3400
0               u4              2A                          3200                              3300
0               u5              2B                          3000                              3100
0               u6
0               u7
1               u100          3A                           3000                              3100   
1               u101          3B                           3200                              3300   
1               u102          
1               u103          
1               u104          4A                           3100                              3200
1               u105          4B                           3400                              3400
1               u106
1               u107
2               u200          5A                           3300                              3300
2               u201          5B                           3000                              3100
2               u202
2               u203
2               u204          6A                           3400                              3400
2               u205          6B                           3400                               3400
2               u206
2               u207   

 

b) FGT data taking summary:


 Started taking FGT into regular data taking after raising HV with new HV (Set 3) around 09:30PM.

Configuration: pp200_production_2012   

Run # Status Events (FGT)
10343057 OK 14324
10343058 OK 14087
13043059 OK 14165
 

 

 

 

 

 
With 1343060 the whole smooth running for the above three runs changed. Immediately from the beginning of the run we encountered FGT errors, i.e. LO different from zero and 'built' being zero. I requested to stop the run, issued a 'REPROGRAM' and then started again. Unfortunately, another problem occurred with very high dead time (EMC related) (Run 1343061). During this time, no FGT error occurred. 

The shift crew took then a run (13043062) with 'pp200_production_noemc_2012' configuration and then proceeded. Run 13043063 was successful without FGT errors, but rather short since we were asked to prepare for beam dump.
 
 HV issue: Around the time of stopping the run (13043062) , the HV went to zero for all channels and then went back up again. I did not issue any commands to influence this nor did I request to ramp the HV back up. You can see this nicely in the following plots:

 

 

 

 

 

 

 
 
 
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