Outline of the Beam Test Analysis Memo

Simulation

Geant4 package and simulations checks

• G3-G4 comparisons
• G4-EGSE comparisons
• CU geometry handling: standalone G4 CUTower simulation
• Low energy EM physics and discovery of LPM effect - improvement in TKR hits
• Hadronic physics lists
• Realistics TKR signal digitization algorithm

Geometry cross-checks

• TKR material audit
  • w thickness - corrected in BT and GR
  • missing mass in the tray boundaries and in the bottom tray - not corrected
• CAL material audit - implemented
• Realistic TKR tray geometry (honeycomb core, glue dots, strips)
• Effect of TKR alignment

Data integrity checks

Beamline checks and scan on extra material

• beam spot tuning and effect on data-MC agreement
• pressure scan on cerenkov, studies with extra layers of material before the CU and between TKR and CAL

CAL calibration

• pedestal drift from rate effect
• pedestal variations and correction with temperature
• light yeld correction with temperature
• LAC thresholds measurement and update in the simulation
• Cross-talks: FLE-FHE, inter-layer and effects on small-big diode intercalibration

TKR response

• no effects seen for high rates
• GTRC/FIFO registers settings
• Optimised split readout

Results

• data-MC agreement matrix
• projections of current discrepancies on background rejection

Tools and lessons learned (for internal collaboration use)

This should be a list of useful things we have developed which could help in minimizing the effort for a continuing analysis and a list of things to improve or avoid

• BtSystemTest
• use of pipeline II - how much effort?
• bad documentation of merit and svac tuples
• confusing naming for tkr hits variables (took a long time to realize that hits variables in merit are actually clusters variables and real hits in the svac)