We discovered a parameter in the DAQ file that was supposed to be changed in order to trigger on more than one channel. This parameter was should be set to 0 to trigger on channel 0 and 3 to trigger on both channel 0 and channel 1. This parameter was not changed originally when we switched to AND triggering.
SiPM 2 and 4 were placed in their delrin holders on either side of the WLS fiber of scintillator 1-74-1 and placed in the darkroom. There was no coupling greased used to hold the fiber in place. Each event was self-triggered when both SiPM were above the trigger threshold of 8320 for a total of 10k events. There was no radioactive source present.
Note: background run must be rerun to access rootfile.
| Table 1: Data files created. |
| Run | Trigger parameter value | Data file | |
| 1 | 0 | 130725_sipm2+4_background_8320threshold_WLSfiber.dat | |
| 2 | 3 | 130726_sipm2+4_background_8320threshold_wlsfiber.dat | |
| Figure 1: Baseline standard deviations for each channel from each run. |
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| Figure 2: Area under the pulse for the trigger parameter at 0 for SiPM 2 only, SiPM 4 only, and SiPM 2 and SiPM 4 combined. |
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| Figure 3: Area under the pulse for the trigger parameter at 3 for SiPM 2 only, SiPM 4 only, and SiPM 2 and SiPM 4 combined. |
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The histograms in Figures 2 and 3 exclude pulses with a baseline standard deviation greater than 7 or with secondary pulses present.
| Figure 4: Direct comparison between trigger parameter values. |
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