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

2. 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

3. December 20033 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

4. December 20034 Options under study: SD, LD, PD

5. December 20035 A Digital Hadronic Calorimeter?

6. December 20036 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

7. December 20037 XML detector description

8. December 20038 Projective vs. Non-projective An important parameter to be studied at the earlier stages of the design ProjectiveNon-projective

9. December 20039 e + e - → Z →  +  - (SDJan03)

10. December 200310 e + e - → tt event (SDJan03)

11. December 200311 e + e - → Z → qq event (SDJan03)

12. December 200312 Same as HCal 1.5 x 1.5 6 * 10.5 cm = 63 cm Tail Catcher -max 1.5 x 1.5 203 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

13. December 200313 Test Beam Simulations Total # cells = 300,000 + 23,200 + 90

14. December 200314 Test Beam EM Calorimeter Front ViewSide View ~6 cm 1 m

15. December 200315 Test Beam Hadronic Calorimeter 1 m 1.25 m

16. December 200316 Test Beam Tail Catcher Front (Hor) Front (Vert) Side Front (transparent) 1.5 m 63 cm

17. December 200317 A test beam event display Inner Cal. Angled View

18. December 200318 Test beam event display

19. December 200319 Test stand simulation

20. December 200320 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: http://nicadd.niu.edu/research/lcd