Geant4-based detector simulation activities at NICADD Guilherme Lima for the NICADD simulations group December 2003.

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Presentation transcript:

Geant4-based detector simulation activities at NICADD Guilherme Lima for the NICADD simulations group December 2003

2 Detector Simulations and Algorithm Developments Support the detector design activities at NICADD Develop useful tools for the whole LCD collaboration Detector simulation, detector geometry representation, object persistency, jet reconstruction and particle flow algorithms Current detector simulation projects: LCDG4, TestBeam, TestStand Dhiman Chakraborty (simulations coordinator), Guilherme Lima, Jeremy McCormick, Vishnu Zutshi

December Detector geometries in LCDG4 Some versions under study  SD detector  LD detector  PD detector Detector components  VXD (vertex detector)  Tracker  EM calorimeter  Hadronic calorimeter  Luminosity detector  Solenoid coil  Muon system SDJan03

December Options under study: SD, LD, PD

December A Digital Hadronic Calorimeter?

December Simulation of a digital HCal High segmentation for better energy resolution: one bit (digital) or two bits (semidigital) per cell Questions to be addressed  Cell shapes (squares, rectangles, hexagons)  Cell dimensions (digital calorimeter)  Projective vs. non-projective calorimeters  Sampling fractions (number of layers, active to absorber ratios)  Cost / performance optimization

December XML detector description

December Projective vs. Non-projective An important parameter to be studied at the earlier stages of the design ProjectiveNon-projective

December e + e - → Z →  +  - (SDJan03)

December e + e - → tt event (SDJan03)

December e + e - → Z → qq event (SDJan03)

December Same as HCal 1.5 x * 10.5 cm = 63 cm Tail Catcher -max 1.5 x cm Total Materials X x Y dim. (m) No. Layers * thickness = total thickness Component Stainless Steel, Polystyrene 1 x 1 50 * 2.5 cm = 125 cm HCal W, G10, Si, Cu, Air 1 x 1 30 * 5 mm = 15 cm ECal Test Beam Simulation

December Test Beam Simulations Total # cells = 300, ,

December Test Beam EM Calorimeter Front ViewSide View ~6 cm 1 m

December Test Beam Hadronic Calorimeter 1 m 1.25 m

December Test Beam Tail Catcher Front (Hor) Front (Vert) Side Front (transparent) 1.5 m 63 cm

December A test beam event display Inner Cal. Angled View

December Test beam event display

December Test stand simulation

December NICADD simulation status Detailed comparisons between LCDG4 and Mokka are in good satisfactory Only cylinders and disks supported by current LCDG4 version More realistic geometries to be implemented in the mid-term MC physics samples are being generated for algorithm development and studies For more information please check: