Apr 18, 2019 Calorimeter
Meeting Time: 11:00 a.m.
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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. Remove BCAL LED triggers from monitoring occupancy plots. (Sean)Completed
FCAL. Collin to show Elton and Mark how to restore bases when communication is lost (Colin, Elton, Mark).Done.
BCAL. Produced histograms of total event energy for a) physics triggers and b) LED FP triggers to decide on online monitoring selection (Ahmed)See details below
- 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
- Collaboration Meeting May 14-16, 2019 at Jefferson Lab.
- Action Items
- Run Updates
- GlueX-doc-3976 Update Costhe Efficiency Method (Elton)
- NIM articles
- Any other business
Attending: Elton, Colin, Mark, Sean (JLab); Tolga (FIU); George (Athens); Matt (IU); Tegan, Zisis, Karthik, Ahmed (UofR); Curtis, Will (CMU).