Difference between revisions of "Taking LED Data"
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=Editing LED Parameters= | =Editing LED Parameters= | ||
| − | * By default the DAC=45 , the pulse width=20ns , the pulse rate = 14.kHz | + | * By default the DAC=45 , the pulse width=20ns , the pulse rate = 14.kHz. But this can be tweaked as explained below. |
* To change the DAC, open "loop_test.sh" and change the 45 to the new desired DAC in line 23 "bash vld_square_pulse_sr.sh 10 45 $j" One expect that lowering the DAC setting by 2 digit lowers the signal by a factor of two. The DAC can be anything between 0 and 63. We find that with the pulse width of 20 ns and cosmic HV, a DAC setting of 55 saturates many of the FADCs. | * To change the DAC, open "loop_test.sh" and change the 45 to the new desired DAC in line 23 "bash vld_square_pulse_sr.sh 10 45 $j" One expect that lowering the DAC setting by 2 digit lowers the signal by a factor of two. The DAC can be anything between 0 and 63. We find that with the pulse width of 20 ns and cosmic HV, a DAC setting of 55 saturates many of the FADCs. | ||
* To change the rate open "vld_calibration_test_args.sh" and line 41 "PULSER SETTING=" to the desired pulse rate | * To change the rate open "vld_calibration_test_args.sh" and line 41 "PULSER SETTING=" to the desired pulse rate | ||
Revision as of 09:06, 9 February 2024
Run Coin Daq VLD Configuration
- follow the daq instructions here:https://hallcweb.jlab.org/wiki/index.php/Hall_C_DAQ#If_the_CODA_vnc_session_disappeared_and_.27go_coin_daq.27_doesn.27t_work
- Start the daq in Coin mode following the instructions above
- In the Run Control GUI select the coda configuration "coin_vld"
- Start a run with ps2=0
Running LED scripts
- ssh to cdaq machine as hccoda user. Navigate to cd /home/hccoda/scripts/VLD/bryan
- Make sure to start the run BEFORE starting the LED scripts, and verify the event rate=0
- Execute the script ./loop_test.sh
- FAQ: if something crashes or an LED gets stuck on, then run ./turn_them_off.sh to cycle through and disable all channels.
Editing LED Parameters
- By default the DAC=45 , the pulse width=20ns , the pulse rate = 14.kHz. But this can be tweaked as explained below.
- To change the DAC, open "loop_test.sh" and change the 45 to the new desired DAC in line 23 "bash vld_square_pulse_sr.sh 10 45 $j" One expect that lowering the DAC setting by 2 digit lowers the signal by a factor of two. The DAC can be anything between 0 and 63. We find that with the pulse width of 20 ns and cosmic HV, a DAC setting of 55 saturates many of the FADCs.
- To change the rate open "vld_calibration_test_args.sh" and line 41 "PULSER SETTING=" to the desired pulse rate
- vme5VLD13 is column3 0,1 and 2. vme5VLD14 is for columns 3,4 and 5. and so on
- connector list 100 is for the lower half of the first column, 101 is for the top half of the first column, and 102 is for the bottom half of the first column. and so on.
- The channel list gives the 16 pmts of the one-half of a column starting from the lower row.
