Difference between revisions of "Mar 21, 2019 Calorimeter"
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# NIM articles
# NIM articles
Revision as of 10:45, 21 March 2019
Meeting Time: 11:00 a.m.
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Participant Direct Lines
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- JLab Phone: in CC F326 is 757-269-6460
- Phone in the Regina Video-conference Suite is 306-585-4204
- Athens Phone: in Christina's office is 011-30-210-727-6947
Goals for Calorimetry Group
- Determine preliminary photon reconstruction efficiencies as a function of E, phi and theta in data and simulation with a point-to-point precision of at least 5%.
- Measure systematics of pi0/eta mass calibration as a function of detector position to a precision of at east 5 MeV.
- Demonstrate agreement of photon reconstruction efficiency and resolution between data and simulation as a function of E, phi and theta to within 5%.
- Complete Calorimeter work packages
- BCAL: Check pulsing rate of LED triggers when FP trigger bit is missing (start with early runs in fall 2018). With discerning software, check pulsing rate of later runs where it appeared that the downstream FP LED bit was not firing. (Ahmed)
- From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal. See Sep 21, 2017 Calorimeter Meeting.
- 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
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