Transcript Generator Services planning meeting

Simulation Project Status
Witek Pokorski, PH/SFT
19.11.2007
Simulation Project
Structure and tasks
Simulation Project (Gabriele Cosmo)
Coordination
Geant4 (John Apostolakis)
LHC-oriented development and support of Geant4 toolkit
Fluka (Alfredo Ferrari)
LHC-oriented development and support of Fluka
Geant4
collaboration
FLUKA
collaboration
Garfield (Rob Veenhof)
Development and support
Physics Validation (Alberto Ribon)
Validation of the detector simulation MC engines
Experiments
Validation
Simulation Framework (Witek Pokorski)
Geometry exchange format (GDML), FLUGG, persistency
Generator Services (Witek Pokorski)
Event generators repository, generator validation, HepMC
19/11/2007
Witek Pokorski
MC4LHC
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Geant4 - Highlights of 2007 (1)
Physics model revisions
Physics improved, after investigating shower shape
 New Quasi-elastic channel
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Not modelled before in high-energy interaction
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Revised FTF model for protons (in v8.3), and pions (9.0)
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Model usable below 10 GeV, being tested down to 4-5 GeV
Models already utilized in revision of physics lists (8.3)
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Accounts for 5-10% of cross-section, replacing part of QGS-‘deep’ interaction
QGSP & QGSP_BERT use new Quasi-elastic channel
FTFP uses revised FTF model
and demonstrated improvement of shower shape (Atlas results) for
either pions (QGSP_BERT best) or protons (FTFP best).
Improved stability of energy loss algorithm achieved
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Demonstrated to 1% level in Fano cavity conditions (LAPP/MPFI)
19/11/2007
Witek Pokorski
3
Geant4 - Highlights of 2007 (2)
Validation and CPU performance
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Validation extended, including
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Assessment of hadron cross-sections
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hadron interactions ( 3, 15, 159 GeV/c )
neutron transport as in TARC experiment (2.5 GeV/c)
Fixes for E>100 GeV, new Barashenkov s for protons
Computing performance (7.1 vs 8.3/9.0 )
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Improved hadronic modeling, more secondaries/steps, cost +20%
Gained ~3-6% addressing leading hotspots
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Use of better models is growing - challenge is their extra CPU cost
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Ongoing work with CMS/FNAL team
multiple scattering (+50%), BERTini (+50%, added in best physics list)
Fixes for NaNs, reported & found
New module for Error Propagation (P.Arce, CIEMAT) – G4 9.0
19/11/2007
Witek Pokorski
4
FLUKA
Highlights from last year
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Flair: the new FLUKA GUI
Release Fluka2006.3b (March 2007)
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Direct pair production by heavy ions
installed in LCG AFS area
FLUKA Course: Houston, May 14-18th
FLUKA Course: Legnaro, October 15-19th
Applications to hadrontherapy (Florian Sommerer, CERN
PhD, won the GSI “Cristoph Schmelzer Award 2007” for
his work applying FLUKA to hadrontherapy monitoring
problems)
19/11/2007
Witek Pokorski
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FLUKA
FLAIR - Program interface
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Wrapper of standalone applications
Tree browser to select application
Allow different ways of viewing the
same object
Input:
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Process:
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Filtering Cards
Show card links
Units: i.e. 20 GeV/c (ToDo)
Data validation
Import/Export on various formats
Debugging
Compilation
Run monitoring
Merging
Plotting:
 Interface to plot packages
 Table of Isotopes
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Python Libraries:
 Input file manipulation
 Processing
 Plotting
19/11/2007
Witek Pokorski
6
CMS Activation study using FLUKA
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Validation of previous studies
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Neutron, charged hadron and photon fluences agree with earlier
calculations
Radionuclide production in cavern air also agrees
M.Brugger, S.Roesler, S.Mueller, R.Ranieri, R. Veenhof and
FLUKA collaboration
Neutron flux near the beam pipe
Present
Earlier
19/11/2007
Witek Pokorski
7
GARFIELD
New developments
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Gas-based detectors simulation program
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Interface with Ansys electrostatics
Analytic solutions found for diffusion in certain
non-homogeneous fields
RD51 is expected to lead to a considerable
increase of activity
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new requirements foreseen
19/11/2007
Witek Pokorski
8
Physics Validation
Activities in 2007
 conclusion of the first round of studies on hadronic shower shapes
 CERN-LCGAPP-2007-02 http://lcgapp.cern.ch/project/docs/noteShowerShapes.ps
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improvement on the longitudinal shower shape in Geant4 version 8.3
(inclusion of a new process)
 Fluka and Geant4 ATLAS TileCal 2002 test-beam validation
 first results presented on 25 July 2007.
 simple (thin-target) benchmarks
 conclusion of the 3rd simple benchmark (inclusive pion production)
 in progress 4th benchmark (single target diffraction in proton-nucleus
collisions in HELIOS).
 radiation studies in Geant4
 TARC benchmark, and LHCb
 close contacts with experimental groups
 ATLAS TileCal, ATLAS HEC, ATLAS CTB, and CMS HCAL
 Man power: currently 1.2 FTEs. Below 1 FTE starting from January
2008
19/11/2007
Witek Pokorski
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Physics validation
ATLAS TileCal 2002 test-beam
20GeV pions:total energy
A.Dotti, LCG Physics
Validation meeting, 25 July
data
2007
data
MC
MC
Other beam energies (50
GeV, 180 GeV, 350 GeV) in
data
progress -expected results
end 2007
data
MC
MC
GOOD
19/11/2007
data
MC
Witek Pokorski
Future work:
Fluka
extension of
the ATLAS
HEC test-beam
analysis.
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Physics validation
Atlas TileCal @90degrees
+ quasi elastic
In Geant4 8.3,
quasi-elastic
process has been
included, and now
QGSP_BERT
describes well the
longitudinal profile.
QGSP_BERT
improves also the
lateral profile,
making showers
wider.
Similar results seen
in other analyses.
T.Carli, LCG Physics
Validation meeting,
17 Oct 2007
19/11/2007
Witek Pokorski
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Simulation Framework
Recent developments in geometry tools
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Geometry Description Markup Language (GDML)
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FLUKA Geant4 Geometry Interface (FLUGG)
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used as exchange format and primary geometry format
new, faster ROOT GDML 'reader'
new GDML-Geant4 interface to be integrated in Geant4
updated for the latest FLUKA and Geant4 versions
extensively used for Physics Validation
Geant4 geometry persistency using ROOT I/O
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all necessary adaptation done in Geant4 and ROOT
19/11/2007
Witek Pokorski
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Generator Services
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new project leader and new organization since
October 2006
project planning meetings every 6-months
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representatives of LHC experiments as well as MC
generators authors involved in decision making
project plan of work commonly agreed
re-focus on efficient installation and validation of MC
generators for LHC experiments
several technical changes introduced to improve the
usability (see next slide)
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positive feedback from experiments and MC authors
19/11/2007
Witek Pokorski
13
Generator Services
Generators repository (GENSER)
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entirely new repository structure introduced
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simple configure/make for building generators
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no restriction on generators' code structure
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difficulties in integrating some generators not present
anymore
generators released individually
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moved away from SCRAM
avoids delay of 'global' releases
ATLAS, CMS and LHCb using GENSER
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more than 20 generators available and used
19/11/2007
Witek Pokorski
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Generator Services
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Generators validation
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increased effort
at least one test for each generator
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tests of distributions added
physics validation
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fruitful collaboration with Rivet/CEDAR project
HepMC event record
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added tests for new C++ generators (Sherpa, Herwig++,
Pythia8)
ATLAS, CMS and LHCb moving to HepMC 2
MCDB - Monte Carlo event data base
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ready to use
19/11/2007
Witek Pokorski
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Simulation Project
Major Milestones : 2005-2008
2005/09: VD522 - 3rd simple benchmark completed
2005/09: VD524 - Validation of Fluka against ATLAS TileCal test-beam
2005/10: VD532 - First results of ATLAS combined and 2004 test-beams data comparisons
2006/03: GS602 - Introduction of MCDB GRID certificates and management of large files
2006/05: G4606 - Developments for Geant4 8.1 public release
2006/06: SF608 - Refinements to GDML schema to support user extensions of elements
2006/06: VD617 - Investigation of corrections to test-beam data for validation of stand-alone simulation engines
2006/12: SF613 - First release of a common framework for MCTruth handling
2006/12: G4618 - Report on the main physics effects responsible for hadronic shower development in Geant4
2007/02: GS704 - Restructure of GENSER to become SCRAM-free
2007/02: GS705 - Redesign of Generator Services Web and creation of GENSER Savannah portal
2007/03: GS707 - New Generator Services Validation Web pages
2007/06: VD703 - Application of corrections to test-beam data to the LHC calorimeter test-beam simulations
2007/06: SF709 - Integration of GDML plug-in in Geant4
2007/09: GS702 - Pythia 8 production release
2007/09: GS710 - Evaluation of the Rivet tool for application in GENSER Validation
2007/09: GS717 - Integration of MC@NLO in GENSER
2007/09: VD721 - TARC benchmark for neutron production, interaction and transportation
2007/11: SF711 - Review, redesign and debugging of the Flugg tool
2007/12: G4712 - Thin-target validations of Geant4 forward physics
2007/12: GS719 - Inclusion of new versions of supported generators in GENSER
2007/12: GS720 - Migration to HepMC-2 for ATLAS and CMS completed
2007/12: G4721 - Developments for Geant4 9.1 public release
2008/02: VD801 - 4th simple benchmark for Geant4 and Fluka: diffraction of nuclei
2008/04: G4802 - Status report on comparisons with shower shapes and relevant physics modeling
2008/06: G4803 - Developments for June 2008 public release
2008/09: VD804 - Fluka extension to the ATLAS HEC test-beam analysis
19/11/2007
Witek Pokorski
16
Current LCG simulation manpower
As of Nov 19
Simulation framework
1.30
Geant4
8.60
Infrastructure, performance, management (approx)
2.40
EM / Hadronic physics effort (approx)
4.50
Tracking, biasing, geometry (approx)
1.70
CERN staff (4.00), CERN fellows/associates (4.60)
1.20
Physics validation
Validation specific to experiments
(0.60)
0.60
Generator services
2.50
management, documentation/release
0.50
GENSER dev., Validation, MCDB
2.00
Fluka
0.00
Garfield (plus CMS activation studies)
1.00
Management
0.25
Total
14.85
19/11/2007
Witek Pokorski
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