1. Layout simulation J Tseng (Oxford) Upgrade Workshop 1 October 2006

2. Layout simulation (J Tseng)2 1 Oct 2006 Outline  Simulation program objectives  Initial studies with strawman  Draft work plan  Upgrade simulation group  Conclusion

3. Layout simulation (J Tseng)3 1 Oct 2006 Program objectives  Work closely with engineering and services groups toward design Understand design constraints Deliverable by SLHC turn-on Match or improve on current detector performance in SLHC environment  Assemble software for layout evaluation Expect many iterations Facilitate design decisions/changes as late as possible

4. Layout simulation (J Tseng)4 1 Oct 2006 First look layout Not the “initial strawman”, but a 3 SS- layer version: r=27,38,50, 70,95cm; all 80μm pitch Barrel SS+LS implemented in first look

5. Layout simulation (J Tseng)5 1 Oct 2006 First look layout H→ZZ→eebb Only barrel SS+LS implemented; pixels left alone

6. Layout simulation (J Tseng)6 1 Oct 2006 Occupancy in first look (1)  Single muon + ~230 pileup  Scales roughly as expected from ID TDR  Innermost layer occupancy > 1% (problem for pattern recognition?) Pitch → 50μm Shorter strips < 3.5cm Pixels  Can we live with > 1%? 1.7% r=30cm 0.61% r=27cm ID TDR

7. Layout simulation (J Tseng)7 1 Oct 2006 Occupancy in first look (2) 1.7% 0.36% 0.64% 1.0% LS: 80μm  12cm SS: 80μm  3.5cm r=27cm r=38cm r=95cm r=27cm r=70cm r=50cm Single muons + ~230 pileup

8. Layout simulation (J Tseng)8 1 Oct 2006 Occupancy in first look (3)  Slower than R -2 falloff  Take with grain of salt: concentration on infrastructure, not materials etc. 80μm  3.5cm 80μm  12cm

9. Layout simulation (J Tseng)9 1 Oct 2006 Draft work plan  Current simulation is limited by infrastructure (and until recently effort)  Major components: Document design constraints Software infrastructure Layout evaluation package Incorporation of data

10. Layout simulation (J Tseng)10 1 Oct 2006 Design constraints  Need to understand our limits, e.g., Acceptable material profile Clearances for service provision Power input, dissipation, density Maximum bandwidth Acceptable occupancy Engineering simplicity Cost  Aim: initial document Jan 2007

11. Layout simulation (J Tseng)11 1 Oct 2006 Software infrastructure  Integrate with main releases, 11.2.0_slhc→12.X→13 (end 2006)  Expunge hard-coded geometry (mid 2007)  Simplify geometry description (end 2006) Versioning in database  Custom digitization? (decide end 2006) Possible to run out of channel ids  Pattern recognition and tracking (mid 2007)

12. Layout simulation (J Tseng)12 1 Oct 2006 Layout evaluation software  MC samples (initial generation, end 2006) Single e/μ/γ  Material effects, conversions Z→ee/μμ  Isolated lepton reconstruction Z’→bb  High-pt b jets tt→WWbb Lots of minbias  Above list ID-centric; others for whole upgrade, such as taus

13. Layout simulation (J Tseng)13 1 Oct 2006 Layout evaluation software (2)  Digit-based performance (mid 2007) Multiplicity per charged particle Occupancy: pileup and b jets Adjacent hits/clusters  Track-based performance (mid 2007) Efficiency, fake rate, isolated and in b jets Track parameter resolution and tails Two-track separation b jet tagging efficiency and fake rate Z mass resolution and resolution tails  Prepare for numerous iterations  Parametric simulation studies

14. Layout simulation (J Tseng)14 1 Oct 2006 Comparison with data  CTB/cosmics Indicate >99% hit efficiency (Oye et al)  Engineering run Material profile, conversions Resolution tails  Physics data Minbias at hit level Jets And physics!  Anything radical at this late stage?

15. Layout simulation (J Tseng)15 1 Oct 2006 Draft work plan

16. Layout simulation (J Tseng)16 1 Oct 2006 Current participants  Abdel Abdesselam (Oxford)  Kenneth McFarlane (Hampton)  Jörg Mechnich (Freiburg)  Jason Nielsen (UC Santa Cruz)  Pavel Nevski (Brookhaven)  Ulrich Parzefall (Freiburg)  Alan Poppleton (CERN)  Other participants welcome Meeting tomorrow, Mon 2 Oct 3:30pm, 40-R-C10

17. Layout simulation (J Tseng)17 1 Oct 2006 Conclusion  Software infrastructure partially adapted to test upgrade layouts A very front-loaded effort Simplify to increase flexibility  Upgrade simulation group starting  Facilitate design timescale to take advantage of new developments  Work with engineering/services groups to deliver design for timely execution