Transcript Document

Detector Description
status and plans
Laurent Chevalier
Dapnia – Saclay
Stefania Spagnolo
Univ. del Salento and INFN Lecce
14/11/2007
CERN - Muon Week
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Outline
 General issues and plans:
 layouts
 M4 setup
 toward a revised layout R in detector description
 validation
 dead matter
 MuonGeoModel RTT jobs
 MuonGeoModel
 MDT deformations
 Volume clashes
 Optimizations
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Layouts – M4 setup
 Primary numbers available in a new Oracle tag in Sept.
 MuonSpectrometer-R.01.01.Initial.Light-M4-EIL4only in
ATLAS-CommNF-03-00-00
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TGC (T1,T2,T3) move by 2.000 m
MDT(EMS/EML) move by 2.000 m
End-Cap Toroid moved by 1.711 m
(Tile extended move by 1.227 m)
 Used for M4 data reconstruction
+2.000m w.r.t nominal
position
 Simulation not started yet:
 a configuration problem (?) preventing correct
simulation identifiers to be produced for TGC
- under investigation
 Adjustments will be needed for
the M5 layout
+1.711m
w.r.t.nominal
position
only EIL4
unchanged
 end-cap chambers moved in the beam direction
- in progress
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Layouts – new version of amdb for layout R
Describe more realistically layout R in the software
 AmdbSimrec-R-02-01 is under development
 first release of ascii format expected by end of November
 then will propagate to Oracle  GeoModel  Simulation  full validation
 based on AmdbSimrec-R-01-01 with updates of active components
only (dead matter as in R-01-01)
 Main changes:
corrected position of BIS, BIR and BIM (up to 7.5 cm in the radial direction)
new BIR subtype with correct RO/HV side
BOG, BOF, BOL will move by ~10 mm (to be worked out)
fix long beam type/size in BMF and EML1,6 to fix clashes (now avoided by
hard-coding in MuonGeoModel)
 RPC 17(in some BOG), 8(some special chambers in BMS across toroid ribs)
correct eta strip number and pitch (to be worked out)  impact on cabling
 BML – change assignment of station eta  impact on Identifier dictionary
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Validation –
dead matter
Materials in MuonGeoModel vs Amdc
Amdc
G4 via GeoModel
Layout R – integrated X0
via Amdc Dead Matter service
by shooting geantinos in the G4
(reading Amdb)
simulation of the MS and integrating
X0 along the track path
many thanks to A. Di Simone
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Validation –
dead matter
 Identified some inconsistency between
GeoModel and primary numbers for dead-matter
 all details in L. Chevalier talk @ Muon Reconstruction
Session
 Alignement bars through EC toroids not at the correct phi
 phi position hard coded in MuonGeoModel
 support between ECT coils too short
 size hard coded in MuonGeoModel
 clearance between connection box and voussoirs to
be removed
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Hole
connection
between coil
and support
R
Aligment tube and ECT coil support
hard coded in GeoModel since...1.5 years
tube lenght in eta 1.66->2.10
Validation - MuonGeoModel RTT
3 jobs running in the RTT tests - MuonGeomRTT
 code + python in MuonGeoModelTest have been re-adapted in order to
configure 3 RTT jobs (many thanks to Stephane W.) now running in the
dev nightly builds
 for each tube/strip/wire-gang dump global position + compare with a reference
(for most relevant layouts);
Check consistency of diff. versions of MuonGeoModel
 hit-relocation: simulate geantino hits + run hit relocation; output: ntuple; root
macro to generate standard plots (by Stephane).
Check coherence of raw geometry (simulation) w.r.t. readout geometry
(reconstruction)
 AmdcMGM (by J.F. Laporte): build Amdc transient model + MuonGeoModel;
compare global positions of each tube/strip/wire;
Check coherence of two models (help enforcing coherence with primary
number conventions)
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Validation - MuonGeoModel RTT
a selection of plots from this week rel_1 nightly RTT - hit relocation
relocated
MDT hits
distance from the
geantino track
z direction
MDT hits R-Z view
relocated MDT hits
distance from the
geantino track
RPC hits X-Y view
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MuonGeoModel - MDT deformations
 New agreed convention on MDT deformation parameters (C. Amelung
and F. Bauer, Sept 3, Muon Alignment Meeting )
 new format of B-lines
 Ivan Logashecho modified the kernel methods in MuonGeoModel to deal
with deformation parameters (fully compliant with new conventions)
 handle only parameters describing rigid tube displacements in the multilayer
 integrated in tag MuonGeoModel-00-05-07 (to go in 13.x.0)
 ok for B-lines 0
 no sensible overhead for extra transforms due to deformation parameters – from
tests in 13.0.30 on MC samples with pile-up and cavern background (Niels Van
Eldik)
 tests of digitization with deformations to be resumed (D. Rebuzzi, R.
Harrington)
 access to B-lines from COOL to be enabled and tested; access methods
to B-lines container to be provided
 TO DO: comparison of B-lines implementation in Amdc-MuonGeoModel
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MuonGeoModel - Volume clashes
 GEANT4 recursive test (depth: 7 levels from Muon System tree top)
very successful on latest tags
 Needs tests of simulation with new version of GEANT4 (with
improved multiple scattering)
 Still to fix (in the active geometry sector)
 feet region
 chambers with cutouts
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MuonGeoModel - Optimizations
memory vs cpu time
 MuonGeoModel (via the new tracking methods) allocates memory
incrementally by building a cache with transforms for each MDT tube and
RPC/TGC/CSC gas gap ! memory allocated by HLT tasks grows slowly
during the run
not nice in the online with 1GByte Ram available per task
 implemented a switch enabling/disabling the caching mechanism to
check the benefit of caching, memory vs cpu time;
 Performance test will be done by running TrigMoore (started by F.
Winklmeier)
 option to fill the cache at start of run under study
 will impact on initialization time – also critical for HLT
 more caching + access via hash id was proposed by the
reconstruction community
 wait for the outcome of HLT performance tests
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MuonGeoModel - Optimizations
MuonGeoModel vs muon EDM
 Id hashes for XxxReadoutElements (provided by new versions of
MuonIdHelpers in dev branch – Ketevi)
 detector manager can give access to XxxReadoutElements via detector
element hash
 XxxReadoutElements vs Data Collections
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Mdt multilayer
DD // Mdt chamber (2 multilayers)
Data Collection
Rpc module
DD //
Rpc set (typically 2 Rpc modules) Data Collection
Tgc chamber
DD //
Tgc chamber
Data Collection
Csc chamber layer DD //
Csc chamber (2 layers)
Data Collection
in a loop over a Collection, this implies using hit identifiers to retrieve the relevant
XxxReadoutElement NOT OPTIMAL
 better design under study
 disc surfaces for TGC – on hold – optimize ~pointing phi strip description
 a bug report concerning a single RPC surface for gas gap with two different strip panels …
not suitable for new tracking ! to be fixed
 generic (but important) optimizations under way: use of MessageStream / internal use of
cached quantities / etc …
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