Difference between revisions of "Long term items"
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# FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928] and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause: | # FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928] and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause: | ||
##50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events | ##50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events | ||
##50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events | ##50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events | ||
##50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events | ##50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events | ||
Revision as of 00:50, 9 August 2020
- FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See Log Entry 3595928 and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause:
- 50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
- 50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
- 50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
