Muon Detector Description status and plans

1
Muon Detector Descriptionstatus and plans

• summary of contributions
• from
• Laurent Chevalier, Andrea DellAcqua,
• Jean Francois Laporte, Stefania Spagnolo,
• Dennis Wright

2
Outline

• Geometry tags
• from Atlas-CSC-01-02-00 (Bulk of CSC production)
  to
• Atlas-Geo-00-00-00 (data taking layout)
• XML to GeoModel translation for Inert Materials
• Forthcoming description of other inert materials
• Performance issues
• Robustness clash cleanup
• Memory allocation
• FDR2 alignment constants loaded run-time
• Atlas-CSC-02-00-00 and Atlas-CSC-02-01-00 the FDR
  2 tags
• Summary of Muon DD functionality in recent and
  future releases

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Content/use of a Geometry tag
Digitization Data Decoding Reconstruction
Id Dict. name
Structured according to amdb specific
conventions
Cabling Maps names
Derived from XML
hopefully soon
amdb blob dump of the ascii file(active XML
dead matter) in a blob
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Geometry tags
ATLAS-CSC-01-00-00

• ATLAS-CSC-01-02-00
• Based on Technical Drawings of Layout R (amdb
  version R01) but
• Station positions (P-lines) account for Egg shape
  global deformation
• default station position ? nominal layout
• Additional random displacements (1mm) and tilts
  (1mrad) of stations with MDTs as static
  Alignment Corrections (A-lines)
• A-lines loaded init time from the same source of
  P-lines (geom-DB, no Cond-DB) 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 Oracle tables
• (primary source) for the active part (good
  validation)
• (?primary source) for the inert materials (very
  limited validation)
• Barrel Toroid, Endcap Toroids, Atlas Feet,
  Shielding (disk, forward and toroid)
• many missing blocks Calorimeter Saddle, TGC
  supports, Big wheel supports others, some not
  yet implemented in Amdb

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Geometry tags

• ATLAS-GEO-00-00-00 vs
  ATLAS-CSC-01-00-00
• Moving from Layout R in tech. drawings to the MS
  layout as installed (amdb version R03)
• Active Geometry
• MDT HV-RO side checked and fixed for a few
  chambers
• station positions fixed for a few stations
• RPC layout in Small Sectors RPC positioning in
  the stations with single RPC units RPC chambers
  with cutouts RPC special chambers heavily
  revisited
• CSC position fixed (layer 2 installed not layer
  1)
• Dead Matter
• In the XML description fix pos. of ID Patch
  Panels PP2 Muon Barrel sect. 13) Access
  Platforms, Feet Struts, MDT Big Wheel,
  Calorimeter Saddle, TGC support pos., BOL
  Support, Mobylette, ECT cryostat fix
• Validation of R03 VERY LIMITED UNTIL NOW NEED
  HIGH STAT. SAMPLE
• hit relocation OK Amdc vs MGM OK
• first simulation tests showed a problem with CSC
  now fixed
• for reconstruction/trigger (LVL1 HLT) emulation
  we need new RPC cabling maps (for very few
  chambers with n. of strips changed w.r.t. old
  layouts)

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RPC layout in R03

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

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Dead Matter in GeoModel/GEANT from XML

• Andrea DellAcqua developed a XML -gt GeoModel
  parser for a transparent translation of Amdb dead
  matter in GeoModel
• no more painful hand coding of the dead matter
  shape and positioning
• use directly primary source of dead matter
  description
• 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, etc.
• presumably wait longer before replacing
  components already existing in MuonGeoModel

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AGDD2Geo
MDT supports
10
AGDD2Geo
TGC supports
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AGDD2Geo
Access platforms
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AGDD2Geo

• TO DO in 14.2.0 and 14.2.10
• material consistency checks
• AGDD had extra materials with no
• correspondence 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 well 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 simulation robustness

• Dennis Wright working on a very careful 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 mm) 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
  (should improve G4 tracking perf.) refine LB
  and CR description linking one object to the
  other to (close to reality)
• fix BOG cutouts
• attaching active-inert clashes
• fixed feet description to fix a clash with BOG
  chambers

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Clash review simulation robustness

• Dennis Wright working on a very careful clash
  hunting and fixing
• after 14.2.0 working on cutouts
• currently only cutouts in MDTs of BOG stations
  are implemented
• strategy to implement the rest
• use GeoCutVolAction for RPCs and DEDs
• (class propagates cutouts in mother volume down
  to all daughters)
• OK for above components because there aren't many
  sub-volumes
• must handle MDTs differently to avoid creating
  too many boolean volumes
• re-writing Mdt.cxx and parts of MultiLayer.cxx in
  order to generalize MDT cutouts to other cutout
  chambers besides BOGs
• improvements in AMDB required in order to
  continue

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Memory 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)

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FDR2 alignment constants loaded run-time
Cool Folder MUONALIGN/MDT/BARREL
System tested up to reconstruction 1 year ago
with old COOL versions and run/event based IoV
definition
MuonAlignmentDbTool loadParameters
A-line container in storegate
step 1
MuonDetectorToolAlign registered for call back
against MUONALIGN/MDT/BARREL
The Alignment wg provided Alines in COOL
computed with an emulation of the optical al.
system with IoV in the range of the FDR2 data
sets just in time for the FDR2 start-up
step 2
MuonDetectorManager updateAlignment compute
deltaTransforms clear tracking cache
update GeoModel transform tree
Before FDR2 we have been able to test just the
access to the condDB by emulating fake events
with time-stamps matching the A-lines IoV ---
test OK no integration of reconstruction
clear/update MuonGeoModel tracking cache
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FDR2 alignment constants loaded run-time

• The integration of reconstruction has been tried
  just at FDR2 we found out what we
  missed
• by default MuonGeoModel assumes no access to the
  cond DB
• minimal change in configuration
• tested on run 522090, before trying in FDR2
• worked fine if MuonTrackingGeometry disabled
  (otherwise a susp. crash)
• integrated but crash run-time on a data set
  522080 ? disable
• Of course testing in final full environment are
  mandatory to ensure no bugs are lurking
• a bug identified in MuonGeoModel in the mechanism
  for clearing the tracking related cache maybe
  related to the observed crash
• MuonAlignmentDbTool/MuonDetectorTool are designed
  to read a single folder from COOL when updated
• but Optical alignment for Barrel / EndCap A /
  EndCap C are independent systems writing
  asynchronously into COOL !
• some redesign is needed
• Better planning/communication of working groups /
  sw community (writing sw is not that fun ! lets
  ensure this is done in the interest of the whole
  muon community)

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Summary of Muon DD functionality in recent and
future releases

• In 14.2.0 / 14.2.10
• MuonGeoModel can handle old layouts
  ATLAS-GEO-00-00-00 (much closer to ATLAS pit for
  active geo. than before) still need extensive
  validation
• make sure we handle it in reconstruction
  (cablings updates for RPC !)
• small differences in conf. for simulation and
  reconstruction (default)
• caching flag OFF, fine clash removal ON
• default dead matter as before (a part from minor
  fixes)
• new dead matter (via XML?GeoModel parsing) will
  be validated in custom productions
• In 14.1.0.Y (FDR2 reconstruction release) and
  AtlasPoint1 branch
• Try to finalize the access and use of condition
  data (access to more folders, full test up to
  reconstruction) for FDR 2 samples and for cosmic
  data (A-lines measured in P4/5 available for
  barrel sector 5 and EC)
• By 14.3.0 integrate validated new dead matter and
  alignment data handling

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Conclusions

• Lot of progress in many areas
• new dead matter
• systematic clash fix
• Data force to improve realism
• RPC layout, CSC layout
• some revision of TGC probably necessary
• Data also show that the sw is not for sw people
  fun
• improve communication ? progress/dev. is planned
  according to muon community objectives
• Still needed
• better way of enforcing coherence simul / reco /
  cablings svc.s
• better definition of intermediate task borders
  ? better scheduling of work to be done