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Alexandre Solodkov. Status of TileCal software. ATLAS offline software. ATLAS offline software is organized in hierarchical structure in ATLAS offline CVS repository There are 3 kind of packages Core packages like Database, Detector Description

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Alexandre Solodkov

Status of TileCal software

Alexandre Solodkov

ATLAS offline software

  • ATLAS offline software is organized in hierarchical structure in ATLAS offline CVS repository

  • There are 3 kind of packages

    • Core packages like Database, Detector Description

    • Non-core common packages like Simulation, Reconstruction

    • Sub-system packages, like InnerDetector, TileCalorimeter

  • All top level packages are split in subpackages, (TileCalorimeter package has ~20 subpackages)

  • Every sub package has a number of C++ source files, which contain algorithms, services, converters, etc.

  • During build procedure every package makes one or more shared libraries

  • All the software is running in Athena framework, the sequence of algorithms to run is set via jobOptions file

Alexandre Solodkov

ATLAS Tag Collector

Alexandre Solodkov

Software development process

  • Every package in offline repository has a coordinator

  • From time to time coordinator decides to produce new tag for the package (i.e. mark all files in the package with special tag, like TileDetDescr-00-02-05) and put this tag in the Tag Collector

  • Every night all packages listed in the Tag Collector are checked out from CVS repository and nightly build is produced

    • build starts at 21:00 Geneva time

    • It takes about 12 hours to build all ~600 packages

  • In the morning developers can see results of the build on the web and test new software in Athena

    • All the dependencies are clearly visible (if change in one package breaks build of another package)

    • 7 last night builds are kept on the disk for tests

Alexandre Solodkov

Nightly builds web page

Alexandre Solodkov

Releases of ATLAS software

  • Every 3 weeks new release of ATLAS software is made

    • Last week release 6.3.0 was built

  • Although developers are trying to provide tested code for such a release, still some bugs are usually discovered here and there

    • Special “Releases status” web page contains up to date information about all the releases

  • Every half a year a major release is produced

    • Deadline for release 7.0.0 is 31th of July

  • If bugs are found in major release, the bug-fix release is made rapidly

    • Only last digit changed, e.g. release 7.0.1

  • Such a major (bug-fixed) release is distributed all over the world and it is used for simulation and reconstruction of big data samples (Data Challenges)

Alexandre Solodkov

TileCal Software developers

  • Software development in TileCal is done in 3 areas and is coordinated by 3 people

    • Simulation and Detector Description (Vakhtang Tsulaia, JINR)

    • Reconstruction and Event Data Model (Frank Merritt, Chicago University)

    • Conditions database and database services (Tom LeCompte, ANL)

  • Members of TileCal collaboration are also developers of the offline software outside TileCalorimeter package

    • Jet finding in Reconstruction package (Ambreesh Gupta, Chicago University)

  • New people are coming this year: Adam Aurisano (Chicago), Gia Khoriauli (JINR), Karl Gellerstedt(Stokholm)

Alexandre Solodkov

TileCal simulation

  • Since long time we provided code for GEANT3 simulation of TileCal (both testbeam and full ATLAS)

  • 2 years ago we started to simulate our testbeam setup with Geant4 (standalone program)

  • Now we are able to run Geant4 simulation in standalone mode and inside Athena, for all testbeam setups and for TileCal in ATLAS

  • Still need to persistfy Geant4 hits (only ntuple-based persistency is available right now)

    • Will be done for release 7.0.0

    • There will be no difference between Geant3 and Geant4 for reconstruction

Alexandre Solodkov

TileCal G4 simulation

TileCal in ATLAS

Testbeam setup

Alexandre Solodkov

TileCal Detector Description

  • ATLAS Detector Description will be a unique source of information for simulation, reconstruction abd analysis stages

  • ATLAS Detector Description uses NOVA database (MySQL) to store all primary numbers

  • Since release 6.2.0 TileCal has interface to NOVA from Geant3 and Geant4; both simulations use exactly the same numbers

  • The work on the so-called GeoModel is going on

    • GeoModel builds detector tree similar to Geant4 tree

    • This tree is available not only at simulation, but also ate the reconstruction stage, i.e. reconstruction will use the same geometry as simulation

    • First prototype will be available in release 7.0.0, the work will be mostly finished in release 8.0.0

Alexandre Solodkov

Tile Data Objects

Tile Algorithms


(signal seen by PMT)







(25-ns time slices)



(after optimal filtering)



(calibrated cell energy)

TileCal Reconstruction

Alexandre Solodkov

TileCal Reconstruction

  • We have all the algorithms to go through full reconstruction chain

  • We are able to generate noise, simulate signal shape, apply optimal filtering

    • Noise is in the release since 5.3.0

    • Optimal filtering is in the release since 6.1.0 (code is taken from Richard Teuscher)

  • We are able to write ByteStream file with energy, time, 2 (output of the ROD) and read it back

    • In the release since 4.6.0

    • Used by HLT group to study Trigger performance

  • We have code for TileCal Level 1 Trigger Towers simulation

    • Need to simulate Level 1 muon trigger (good task for the beginner!)

Alexandre Solodkov

TileCal Reconstruction plans

  • In nearest future we are going to provide code for pileup generation using Athena pileup service

  • We will extend our optimal filtering code to deal with out-of-time signals

  • We will continue to work on improvement of all our algorithms, will take into account recommendations of RTF

    • Separation of event and non-event (DetDescr) data

    • Implementation of all corrections (calibrations) as AlgTools, i.e. outside reconstruction algorithms, for easier replacement

      • First AlgTool was written by Gia Khoriauli just in 2 weeks!

    • New hadronic energy calibration (with LAr)

Alexandre Solodkov

TileCal Identifiers

  • Identifier is a special object for identification of every sensitive element of ATLAS detector

  • There are 2 kind of Identifiers

    • Offline identifier in TileCal describes position of cell in (,,r) space

    • Online identifier (hardware identifier) in TileCal describes one readout channel: (drawer#,channel#)

  • We are using offline identifiers for Geant hits and CaloCells and online identifiers for our Digits and RawChannels

  • For the moment all numbers for Tile Identifier are kept inside C++ code, migration to Data Dictionary (i.e. external XML file with all numbers) will be done for release 7.0.0

  • There is a new proposal now to provide identifiers to all passive materials in ATLAS with 0.1 granularity in (,) space (can be implemented around release 7.5.0)

    • Energy deposits in passive material will use this identifier

    • This will be used for fine-tuning of hadronic calibration algorithms

Alexandre Solodkov

Testbeam analysis in Athena

  • We almost at the point when we can read testbeam data in Athena

  • The ByteStream package in Athena needs to be modified slightly

    • Will be done by expert (Hong Ma) soon

  • After that it’s TileCal responsibility to unpack “digits” and to apply optimal filtering properly

    • Need to merge TileNtuple unpacking with ByteStream unpacking in Athena

    • Work will start in august by Karl Gellerstedt

  • Also need to provide interface to testbeam calibration database in Athena

Alexandre Solodkov

TileCal Database

  • Do not have too much in Athena now

    • Waited for common ATLAS approach to Conditions database

  • We are reading ASCII files for the moment

  • Want to try new “Interval of Validity” service (IOVSvc) available in release 6.3.0 and to store/retrieve our conditions data (calibrations constants)

  • After we understand how IOVSvc works, we might use it for all our calibration constants, including constants for testbeam analysis

Alexandre Solodkov


  • TileCal software development, although understaffed, is going not too bad

  • In some areas we are quite advanced thanks to efforts of our simulation / reconstruction / database coordinators

  • The software development in Athena framework is now at the stage when even non-experts can do something

  • Many results already achieved …

  • … but still a lot of work to be done!

Alexandre Solodkov

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