| Internal Note | |
| Report number | CERN--Note-2023-003 |
| Title | Luminosity calculation and threshold scan for the VeloPix ASICs |
| Author(s) | Girard, Lea |
| Corporate author(s) | CERN. Geneva. EP Department |
| Publication | 2023 |
| Imprint | 25 Oct 2023 |
| Subject category | Detectors and Experimental Techniques ; Particle Physics - Experiment |
| Accelerator/Facility, Experiment | LHCb |
| Keywords | LHCb ; VELO ; Luminosity ; Noise ; DAC Threshold |
| Abstract | During my summer project I calculated the rates of the MonB counters from the VeloPix ASICs. Using these rates, I then studied the luminosity of the collisions in the LHCb detector. Studying archiving of the MonB data from past runs we realized that the rates and luminosity have a linear relation and the linear fit parameters can be used to calculate luminosity in real time. Secondly, the VELO team has a goal of setting up all of the ASIC DAC thresholds so that the noise rates are all close to a goal rate. I developed an algorithm to set these thresholds automatically in a single scan. |
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