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CUPC Talks

Fri., Oct. 17, 2014 2:30 p.m. - Fri., Oct. 17, 2014 3:30 p.m.

Location: ED 612

Title: Variation of Mean Energy Deposition from Cosmic Rays for the GlueX BCAL

Abstract: Because of the inherent geometry of the GlueX Barrel Calorimeter (BCAL), mean energy deposition from cosmic rays varies with position about the BCAL. This is well understood to be due to the size, shape and position of the readout channels which are associated with particular summed groups of Silicon Photomultipliers (SiPMs) on either end of the detector. By graphical analysis of these energies compared to the modules which make up the BCAL, we can confirm that we see the expected patterns of energy distribution, and can identify preliminary calibration problems such as mis-cabling issues. My presentation will include a description of how we come to expect certain mean energy patterns in the BCAL, as well as physical cosmic data and a Monte Carlo simulation, which both largely confirm these expectations.

Speaker: Laura Teigrob


Title: Investigating the Expected Cosmic Event Rate Distribution in the GlueX Barrel Calorimeter Using a Monte Carlo Simulation

Abstract: Calibration of the segmented, cylindrical Barrel Calorimeter (BCAL) used in Jefferson Lab's GlueX experiment relies upon data from cosmic rays. Analyzing the distribution of cosmic event rates as a function of module number, an unexpectedly large discrepancy was found between the most and least active regions. This behavior was not predicted based on the geometry of the BCAL and its scintillating trigger panels, so an investigative Monte Carlo simulation was developed to compare the data to prediction. Results of the simulation indicate that one side of the detector appears to be functioning properly, but the other half is showing substantially fewer events than predicted. The exact nature of this issue is currently under investigation. This presentation will provide an overview of the BCAL as well as a detailed description of the development and analysis of the simulation.

Speaker: Shayne Gryba