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

Layout simulation

J Tseng (Oxford)

Upgrade Workshop

1 October 2006

Layout simulation (J Tseng) 21 Oct 2006

Outline

Simulation program objectives Initial studies with strawman Draft work plan Upgrade simulation group Conclusion


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


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


First look layout

H→ZZ→eebb

Only barrel SS+LS implemented; pixels left alone


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



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



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


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


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


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 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 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


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?


Draft work plan


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


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

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

Documents