Hall C Pedestal Runs and Determining FADC Thresholds
From HallCWiki
Overview
This How-To discusses the necessary steps required in order to take a pedestal run utilizing the single arm DAQ's. Furthermore, the steps required in-order to determine the appropriate FADC thresholds are discussed.
Taking Pedestal Runs
- Ensure that both single arm DAQ's are configured with the "fadcnothr" flag, which is activated via. of the pre-scale GUI, and the configuration has been saved
- With both arms take at least 1000 cosmic or EDTM triggers and note the run numbers
Determining the FADC thresholds
- The following example will illustrate the necessary steps required to determine the FADC thresholds for SHMS ROC 2
- On the SHMS side, this procedure will have to be repeated for both ROC's 2 and 4
- On the HMS side, this procedure only has to be executed for ROC 1
- With the pedestal runs complete, open a terminal and SSH into cdaql1
ssh cdaq@cdaql1
- Setup the hallc-online analyzer
go_analysis
- Descend into the hallc-online hcana/podd directory
cd ../hcana/podd/hana_decode/
- Exectue the tstfadc_main.C script
./tstfadc
- Input the appropriate configurations: raw data file location, run number, number of events, spectrometer name, crate number
Enter the location of the raw CODA file (raw, cache, raw.copiedtotape): raw Enter a Run Number (-1 to exit): 1537 Enter Number of Events to Analyze (-1 = All): -1 All Events in Run 1537 Will be Analayzed Enter the Spectrometer Name (hms or shms): shms Enter the Crate Number to be Analyzed: 2
- If successful, the for file "fadc_data.root" will have been produced
- In order to produce the threshold text file "thresholds.dat" one needs to execute the calc_thresh_hallc.C ROOT script
root -l ./calc_thresh_hallc.C
- Input the appropriate configurations: spectrometer name, crate number, FADC mode, threshold in channels
Enter the Spectrometer Name (hms or shms): shms Enter the Crate Number to be Analyzed: 2 Enter The Mode of The F250's: 9 Enter The Number of Channels Above Baseline the Threshold Should Be [40 (10 mV) recommended]: 40