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Layout simulation (J Tseng) 21 Oct 2006
Outline
Simulation program objectives Initial studies with strawman Draft work plan Upgrade simulation group Conclusion
Layout simulation (J Tseng) 31 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
Layout simulation (J Tseng) 41 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
Layout simulation (J Tseng) 51 Oct 2006
First look layout
H→ZZ→eebb
Only barrel SS+LS implemented; pixels left alone
Layout simulation (J Tseng) 61 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
Layout simulation (J Tseng) 71 Oct 2006
Occupancy in first look (2)
1.7%
0.36%0.64%
0.64%1.0%
LS: 80μm12cm
SS: 80μm3.5cm
r=27cm r=38cm
r=95cm
r=27cm
r=70cm
r=50cm
Single muons + ~230 pileup
Layout simulation (J Tseng) 81 Oct 2006
Occupancy in first look (3)
Slower than R-2 falloff Take with grain of salt: concentration on
infrastructure, not materials etc.occupancy (3 SS + 2 LS)
0
0.5
1
1.5
2
0 20 40 60 80 100
radius (cm)
% mean
80μm3.5cm
80μm12cm
Layout simulation (J Tseng) 91 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
Layout simulation (J Tseng) 101 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
Layout simulation (J Tseng) 111 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)
Layout simulation (J Tseng) 121 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
Layout simulation (J Tseng) 131 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
Layout simulation (J Tseng) 141 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?
Layout simulation (J Tseng) 161 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
Layout simulation (J Tseng) 171 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