LAT Newsletter contributions from Beam Test Team
Issue 3 -
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submitted 30 april
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Draft:
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Luca Latronico, Philippe Bruel
April 30 2007
A very detailed status report of the beam test data analysis was presented at the last collaboration meeting, in a
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dedicated session which was very well received by the collaboration.
The CU response to irradiation was described in specific talks, as well as the changes suggested for the MonteCarlo simulation of the subsystems in order to get a better agreement with data.
The overall status was summarized in a final talk for the collaboration, where the main outcomes that we expect to deliver to the LAT simulation were presented. These include
- a Main outcomes to the collaboration were agreed new TKR digitization algorithm, including charge sharing effects, and cross talk effects for large signals (heavy ions saturating input charge amplifier, possibly electronics signal simulation)); this will partly cure the discrepancy
- a new CAL modules calibration procedure that takes into account electronics cross talks and charge injection asimmetries
- an optimized hadronic physics list to identify that identifies the best Geant4 simulation engines for hadronic interactions in the LAT
- a comprehensive material review Schedule of deliverables extending to all subsystems
The schedule for these deliverables was later discussed inside our working group, and we agreed
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to release a first round of these changes by the end of april, to be able to evaluate the effects on data-MC comparison and support the implementation in GlastRelease
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As this issues goes in press, we are in fact going through a massive data reprocessing and MC generation with
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an updated version of our simulation/reconstruction package (BTRelease)
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, which incorporates the latest calibrations, a new TKR digitization algorithm
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and the xtalk correction in the CAL.
Studies on hadronic phyisics
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are an on-going hot topic, as is a standalone G4 simulation with a realistic honeycomb structure that aims at testing the difference between homogeneous, distributed materials versus isolated material (like the TKR honeycomb). Preliminary results indicate no effect on the CAL energy deposition,
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while the impact on the TKR hit discrepancy is under evaluation.
Finally, the proceedings of the four contributions we submitted to the First Glast Symposium have been combined into a single paper and submitted for publication.
Issue 2 - Studying the ACD Backsplash with beam test Data
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