[Primexd] [Revised Logentry] Trigger studies

[somov at jlab.org]

Logentry Text:
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We have performed  some minor adjustment of the PrimEx 
trigger (on Saturday), new features are listed below:

(new settings are effective starting from run 61462)

1. ) Several FCAL channels have been unmasked for the 
trigger (these channels have been repaired earlier). 
FCAL scalers corresponding to the PrimEx production 
beam condition are presented in Fig. 1. 

There are four channels, which rate is about 30 kHz 
(slightly larger compared with adjacent modules), we 
decided to leave them unmasked.

After releasing masks, the trigger rate was increased by 
about 7%.


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2.) Two ancillary triggers were added to the main 
production configuration:

 E_FCAL  >  10750  (Bit 2)
 E_CCAL  >  4778   (Bit 11) 

We studied these trigger types separately before integrating
them to the global configuration. Data were taken in a raw
mode using different trigger types:

run 61450  -  CCAL & FCAL trigger

run 61451  -  E_FCAL > 10750  (bit 2) 
run 61452  -  

run 61453  -  E_CCAL > 4778   (bit 11)

run 61455  -  CCAL & FCAL (bit 1), FCAL (bit 2), CCAL (bit 11) triggers
run 61456
run 61458

Fig. 2 shows energy deposition for different trigger bits 
for run 61458  (this is not the detailed trigger emulatuion)

Note, the FCAL and CCAL triggers are correlated with the main
production trigger

Fig. 3 Trigger rates for production on the LHe target at 200 nA
(~20 kHz main production, 5.5 kHz PS trigger). 
The typical live time > 99 %.

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3.) CDC was included to the readout (run 61462).
Reading out CDC crated for given production conditions 
does not contribute to the DAQ dead time (live time ~99.1 %)

We encountered problems with monitoring of high-level 
RootSpy histograms after adding the CDC; the CDC was temporary 
excluded from the readout configuration.

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