28/05/2008 Muon Combined Performance Meeting

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Muon Detector DescriptionMuon Detector Descriptionand Simulationand Simulation

status and plansstatus and plans

summary of contributions from

Laurent Chevalier, Andrea Dell’Acqua, Alexander Khodinov, J.Francois Laporte, S.Spagnolo, Dennis Wright

28/05/2008 Muon Combined Performance Meeting

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OutlineOutline• Detector Description

– Geometry tags• from Atlas-CSC-01-02-00 (Bulk of CSC production) to • Atlas-CSC-02-00-00 and Atlas-CSC-02-01-00 the FDR 2 tags • Alignment Constants as Condition data

– MDT deformations • Atlas-Geo-00-00-00

– XML to GeoModel translation of Inert Materials– Performance issues:

• Robustness: clash cleanup • Memory allocation

28/05/2008 Muon Combined Performance Meeting

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Geometry tagsGeometry tags• ascii Amdb content:

– structured description of active materials: station definition, internal structure of station components, station positions, corrections to station positions

– XML description of dead materials – old fashioned structured description of some inert materials

• content of a generic MuonSpectrometer tag under a generic ATLAS geometry tag (for example ATLAS-CSC-02-00-00)

– full ascii Amdb as Blob – tables for the structured description of active materials – tables for some dead matter components computed from the

XML or the old fashion inert materials description in ascii Amdb– MuonIdentifiers table – linking to the Offline Id dictionary – Muon System envelop used by MuonGeoModel in simulation and reconstruction

28/05/2008 Muon Combined Performance Meeting

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Geometry tagsGeometry tags• ATLAS-CSC-01-02-00 ATLAS-CSC-01-02-00 ACTIVE components

– Detector and dead matter components based on Technical Drawings of Layout R (amdb version R01)

– Station positions account for Egg shape global deformation (P-lines) • default station position ≠ nominal layout

– Additional random displacements (~1mm) and tilts (~1mrad) of the chambers described as Static Alignment Corrections

• A-lines loaded init time from the same source of P-lines (geomDB, no CondDB) but applied as corrections (Delta Transforms) on top of the default position and orientation of the station

– MuonGeoModel implementation fully driven by primary numbers in the DB (Oracle tables filled from ascii AMDB)

• ascii Amdb is also in Oracle as a blob

– Good validation of active materials

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Geometry tagsGeometry tags• ATLAS-CSC-01-02-00 ATLAS-CSC-01-02-00 INERT components

– Barrel Toroid, Endcap Toroids, Atlas Feet, Shielding (disk, forward and toroid) all implemented from the dead matter tables

– very limited validation– measurement of radiation length seen along the path of geantinos in

GEANT 4 in comparison with the expectations from XML description of dead matter + active components in Amdc (transient model of Amdb) is

• integral check of consistency (marginal, heavy, statistically limited)• results ~ ok (showed some problems, fixed)

– Missing inert materials in MuonGeoModel and simulation:• Calorimeter Saddle• TGC supports • Big wheel supports • … …others, some not even implemented in Amdb

28/05/2008 Muon Combined Performance Meeting

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RPC layout in R03.01RPC layout in R03.01

• As shown also from hit residualsstudies with cosmic ray data, the RPC layout in the small sectors does not correspond to the nominal layout

Changes involve displacement in the radial directions of ~ 5 cm for most stations in the small sectors, for all stations with a single RPC unit covering the MDT multilayer;

All cutouts in RPC chambers has been revisited; Layout of RPC chambers between the barrel coil ribs has been

revisited.

28/05/2008 Muon Combined Performance Meeting

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Geometry tags for FDR2Geometry tags for FDR2• ATLAS-CSC-02-00-00 ATLAS-CSC-02-00-00

– Layout R: as in ATLAS-CSC-01-00-00 – Station positioning as in nominal layout

• ATLAS-CSC-02-02-00 ATLAS-CSC-02-02-00 – like ATLAS-CSC-02-00-00 but – Station positioning account for global deformation (Egg shape) in P-

lines (default position) and no random misalignments in A-lines (delta corrections)

• global deformation and misalignment effects as in

ATLAS-CSC-01-02-00

• 2-6 May in FDR 2, 2 out of 5 runs will be reconstructed with ATLAS-CSC-02-00-00 ATLAS-CSC-02-00-00 3 with ATLAS-CSC-02-02-00ATLAS-CSC-02-02-00

• simulated alignment data will be written in the cond DB (runtime during the FDR2 or later) for subsequent test of the IoV dependent correction of the geometry model – correcting perfectly and/or within ~100microns

no muon data in Condition DB tags

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MuonGeoModel uses a MuonAlignmentTool for accessing the condition DB (COOL) and unpacking the alignment data blob into A-lines parameters

Access to the DB is driven by the IoV service via the Align method of MuonGeoModelTool (full standard GeoModel schema)At IoV transitions • the alignment constants are loaded and stored in the Detector Store• delta transforms (MuonGeoModel specific)

• are computed from A-lines• applied the whole cache (GeoModel specific) + Tracking related (surfaces, transforms, etc) is cleared for all stations with updated constants

System tested in reconstruction ~1 year ago with old COOL versions and run/event based IoV definition

Agreed definition and of B-lines for MDT deformations in place – waiting for testing

Handling of Alignment Constants as condition dataHandling of Alignment Constants as condition data

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Geometry tagsGeometry tags• MuonSpetrometer-R02.03

– Amdb version R02 – few fixes of active geometry:

• HV-RO side of some MDTs inverted• internal structure (strip pitch/number) for some RPC • fix position of a few chambers

– CSC chambers installed are layer 2 not 1 (like in old description)– major upgrade of XML dead matter description

• TGC support / BOL support/ ID patch panel/ access platforms/ Feet struts/ Calorimeter Saddle not in MuonGeoModel

• MuonSpectrometer-R03.01 for ATLAS-GEO-00-00-00– Amdb version R03– like R02 + major revision of RPC layout , following the station

mounting conventions adopted in BB5– delivered in ORACLE last Monday – needs extensive validation

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Dead Matter in GeoModel/GEANT Dead Matter in GeoModel/GEANT from XMLfrom XMLAndrea Dell’Acqua developed a XML -> GeoModel parser for a

transparent translation of Amdb dead matter in GeoModel – no more painful hand coding of the dead matter shape and

positioning

AGDD2Geo in 14.2.0 (not active yet in any default configuration)• Amdb blob (with XML dead matter) read from Oracle• all components in Amdb are translated into GeoModel volumes,

hence Geant4 volumes via Geo2G4• by job-option one can enable to built a selection; no changes

needed for the moment in MuonGeoModel • planning to start with MDT/TGC supports in the big wheels

– if tests in simulation are OK add platforms, services at eta 0, calo saddle

– presumably wait longer before replacing components already existing in MuonGeoModel

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AGDD2GeoAGDD2Geo

MDT supports

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AGDD2GeoAGDD2Geo

TGC supports

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AGDD2GeoAGDD2GeoTO DO in 14.2.0• material consistency checks: AGDD had extra materials with nocorrespondence in Oracle yet. • geometry checks (mostly in simulation)check for unforeseen overlaps, for correct material distribution• GEANT4 tracking performance maybe the most critical chapter (impact on simulation timing, memory)• reconstruction checks make sure the whole chain from simulation to reconstruction works properly

After these checks – we’ll freeze, as default, a configuration of default options for MuonGeoModel + AGDD2Geo to enable the tested components in simulation and reconstruction

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Clash review – Clash review – simulation robustnesssimulation robustness • Dennis Wright working on a very carefull clash hunting and fixing• fixes in 14.2.0

– started from nominally aligned layouts, cured residual small active-active clashes due mostly to shared surfaces (introduced suitable tolerances on volume dimensions)

– moved to misaligned layout: many clashes of tilted chamber corners (~100 m) cured by reshaping a tighter station envelop, by subtracting and adding half cylinder shapes to a minimal trapezoid

• event display becomes heavy • solved by enabling(in MC)/disabling(in Reco) this fine clash fixing

procedure by job option

– simplified spacer beam description + fixes– fix BOG cutouts – attaching active-inert clashes

• fixed feet description to fix a clash with BOG chambers • more to do … especially on still un-implemented cutouts

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Memory issuesMemory issues• MuonGeoModel budget ~ 130 MB (out of ~1GB

allocated by simulation tasks, ~2GB allocated by reconstruction tasks)– 50 MB are purely from GeoModel

• can be reduced to a minimum in reconstruction by forgetting all the internal details of detectors (i.e, components linked to readout geometry classes, used by reconstruction)

– to be done

– 80 MB are a tracking related cache (used to be built run-time on demand, since 14.1.0 is fully built init time)

• can be turned on in simulation– easy and done

• can be optimised (centrally, not in MuonGeoModel)