1. FAIR Simulation&Analysis Framework FairRoot
Mohammad Al-Turany (IT-GSI)
Denis Bertini (IT-GSI)
Florian Uhlig (IT-GSI)
Ilse König (Hades-GSI)

2. Overview Motivations FairRoot Features FAIR experiments design studies
Geometry Interface
Runtime Database and Parameter Handling
Integrated Track follower (Geane)
FAIR experiments design studies
CBM
PANDA
HADES
Summary
CHEP07 5 september

3. Fair@Gsi CBM Improvements: SIS100/SIS300 GSI Accelerator Facilities
Primary beam intensity 100 – 1000 x
Secondary beam intensity
for radioactive nucl.: up to x
Ion energy: x
New features:
fast pulsed supraconducting Magnet
„cooled“ Antiproton beam
up to 15 GeV
Specific:
intense „cooled“ beam
radioactive ‚exotic nucleus
SIS100/SIS300
GSI
Accelerator
Facilities
CBM
HESR
ESR
UNILAC
Super- FRS
Plasma Physics
PANDA
Atomic Physics
FLAIR CR
NESR
CHEP07 5 september

4. Motivations Which simulation engine to choose?
Need to move to modern and maintained MC: GEANT4
Need for
Working fast ! ( LOI, TDR deadlines … )
Making reliable simulation
Usually: better knowledge of “old” MC’s: GEANT3, FLUKA …
A cross-check of simulation results between different MC is needed
Better understanding of GEANT4 ( intrinsic cuts / physics list …)
Preparing for full simulation
Use of VMC (Virtual Monte Carlo ) : an interface between MCs
With the same code, the user can switch between different MCs
CHEP07 5 september

5. Features The same framework can be used for Simulation and Analysis
Fully ROOT based:
VMC and VGM for simulation
IO scheme (TChain, friend TTrees, TFolders ) for persistency
TTask to organize the analysis data flow
Use of TGeoManager for Simulation and Reconstruction
Completely configurable via ROOT macros
Easy to maintain (only ROOT standard services are used)
Use of a Geometry Interface.
G3 Native geometry
Geometry Modeller (TGeoManager)
Different geometry input format
CHEP07 5 september

6. Configuration, Parameters,
CBM Simulation
ROOT
Geant3
Geometry
Manager
Virtual MC
Geant4
Magnet
FLUKA
Target
IO Manager
GeoInterface
Run Manager
PIPE
Oracle
Configuration, Parameters,
Geometry
RunTime
DataBase
Cave
Module
Primary
Generator
Magnetic
Field
STS
Root files
Configuration,
Parameters,
Geometry
Detector
TRD
Tasks
EVGEN
TOF
Particle
Generator
RICH
Pluto
Field Map
ECAL
ASCII
Urqmd
CHEP07 5 september

7. Configuration, Parameters,
CBM Analysis
Root files
MCPoints, Hits,
Digits, Tracks
ROOT
Geometry
Manager
Oracle
Configuration, Parameters,
Geometry
IO Manager
GeoInterface
Run Manager
RunTime
DataBase
Module
Primary
Generator
Magnetic
Field
Root files
Configuration,
Parameters,
Geometry
Detector
Tasks
EVGEN
Delta
digitizers
Tracking
CHEP07 5 september

8. Panda Simulation
CHEP07 5 september

9. Geometry Interface Advantage: Oracle interface
more flexibility : different inputs can be used.
closer to technical drawings and analysis coordinate systems
Oracle interface
Hades geometry table design reusable
CHEP07 5 september

10. Material & Geometry Interface
TGeo Geometry/Material
TGeoVolume
TGeoNode
TGeoMaterial
Oracle DB
CbmGeoInterface
ASCII
G3 Geometry/Material
G3Builder
RootBuilder
XYZ Geometry/Material
Root
files
XYZ
CHEP07 5 september

11. Creation, Initialization, Output
Runtime Database
The Runtime Database is the manager class for all Parameter containers:
Creation, Initialization, Output
Runtime Database
Created in the init() function of the tasks via the container factories or in the macro
Container Factories
2 Inputs
1 Output
List of Parameter Containers
List of Runs
read()
write()
Filled during initialization
ASCII File
ROOT File
Oracle
IO defined in the macro
CHEP07 5 september

12. Version management in Oracle
For time dependent information a version management is needed which fulfills the following requirements:
It must be possible to get a consistent set of information for any date (e.g.the start time of a certain run).
To preserve the history, no information - even if wrong - should be overwritten without trace, which means that only inserts should be made, no deletes nor updates.
It must be possible to get an answer to the question: 'Which parameters were used when analyzing this run X years ago?' (The calibration might have been optimized several times since this date. Maybe some bugs have been detected and corrected in the mean time.)
CHEP07 5 september

13. Version management in Oracle
Time dependant entries have a time stamp (date + time with
the precision of one second) in form of three columns (Format:
DATE):
valid_since :First date when the entry is valid.
valid_until :Last date when the entry is still valid
invalid_since :Date when the entry is replaced by a correct entry or a better version in case of e.g. calibration parameters and therefore gets invalid.
CHEP07 5 september

14. Example: CbmGenericParSet
Base class for most parameter containers
Advantage:
only a few lines of code to be implemented
all I/O interfaces exist already
Allows to store various types of parameters (handled by CbmParamList):
int, float, double, strings,…
arrays
TObjects (classes, histograms, …)
class CbmParGenericSet : public CbmParSet {
public:
CbmParGenericSet(const char* name,const char* title,const char* context)
: CbmParSet(name,title,context) {}
virtual ~CbmParGenericSet() {}
virtual Bool_t init(CbmParIo*);
virtual Int_t write(CbmParIo*);
virtual void putParams(CbmParamList*)=0;
virtual Bool_t getParams(CbmParamList*)=0;
virtual void printParams();
in derived class implemented
CHEP07 5 september

15. Initialisation scheme (Analysis)
CbmTask
Parameters
Data
File=1
CbmParIo
RunId1
RunId1
CbmTask::SetContainers()
CbmTask::init()
Par. Cont.
Sim. Data
CbmTask::Exec()
CbmParIo
CbmTask::Reinit()
File=2
RunId2
RunId2
Par. Cont
Sim. Data
CbmTask::Exec()
CHEP07 5 september

16. Combined Chain& Friend
Make use of our CbmRootManager (IO):
When the TChain switch to new file:
Clear the global list of friends
Add the correct next friend to the list
Update the corresponding pointers (TTree, Friend Tree ..)
Combining Chain with Friend:
{ //…
CbmRun *fRun = new CbmRun();
fRun->SetInputFile(“rich_hit1.root”);
fRun->AddFriend(“Rguidance1.root”);
fRun->AddFile(“rich_hit2.root”);
fRun->AddFriend(“Rguidance2.root”);
//…
fRun->Init();
fRun->Run();
… }
CHEP07 5 september

17. Geane Integration in FairRoot
The integration into the VMC (TGeant3) is done
In FairRoot:
Geane can be used in the analysis or from macro
Propagation to
Length
Plane
Volume (Enter or Exit point)
CbmPoints and/or CbmTrackParam can be used as input for propagation
See talk of Andrea Fontana
CHEP07 5 september

18. Muon Absorber in CBM
CHEP07 5 september

19. CBM
tracking, vertex reconstruction: radiation hard silicon pixel/strip detectors (STS) in a magnetic dipole field
electron ID: RICH1 & TRD (& ECAL)  p suppression  104
hadron ID: TOF (& RICH2)
photons, p0, m: ECAL
high speed DAQ and trigger
ECAL
RICHs
magnet
beam
TOF
TRDs
target
STS
CHEP07 5 september

20. Analysis: π0e+e-
CHEP07 5 september

21. CBM:KO electrons production in the Au target
(setup in the air or in vacuum B=1T)
Geant3
Geant4
7.9 B=1T
CHEP07 5 september

22. Hades@GSI Tof Coils MDC 1,2 Rich MDC 3 Shower MDC 4
Goal: Study of in-medium modifications (r, w, j) properties
Produced in A+A, p+A, p+A collisions
Di-electrons are used as probes: Ve+e-
Hexagonal symmetry around the beam axis
Geometrical acceptance of 40%
Invariant mass resolution of 1%
Operates at reaction rates up to 106 /s  Tbyte/year
~ readout channels
CHEP07 5 september

23. Hades example Interesting case !
Need to simulate heavy system at High energy
Need external stack for Geant3: internal stack capacity reached)
Check data with geant4
Easy reuse of FairRoot framework services
Interesting case !
Gives us the opportunity to tune Geant4 (cuts/physics list …)
and compare with real Data !
Realistic test of the framework
CHEP07 5 september

24. HADES: MDC Hit distribution
Geant3
Geant4
Cross-check with Hades data to be done !
CHEP07 5 september

25. Multi purpose detector at FAIR
The Panda experiment
Multi purpose detector at FAIR
Charmonium (cc) spectroscopy
Open charm spectroscopy
Search for gluonic excitations
(hybrids - glueballs)
Charmed hadrons in nuclei
Single and double Hypernuclei
Other options (EFF, GPD, …)
Physics program
pp, pA collisions
1.515 GeV/c (p momentum)
CHEP07 5 september

26. PANDA Detector implementation: proposed geometry
CHEP07 5 september

27. Detector implementation: state of art
COILS
(dipole)
view from geometry manager
Muon Detector
DIRC
(Cherenkov)
TPC/STT
Micro Vertex
EMC
(Fwd EndCup)
COILS
(solenoid)
EMC
(barrel/Bkw EndCup)
CHEP07 5 september

28. Reconstruction example: c in EMC barrel
crystal
crystal
c at rest
in lab frame c
only barrel
not yet full
coverage c
cluster
two clusters ° 
Clusterization
Jan Zhong
Dima Melnichuk
CHEP07 5 september

29. Summary A VMC based framework for FAIR has been implemented
First released in March 2004
Used for FAIR experiments design studies
Ongoing work
Check of Geant4 VMC interface
Check of TFluka VMC interface
Use more intensively the TGeoManager services for the
reconstruction
CHEP07 5 september

30. Availability Tested on Binaries are also available for these platforms
Red Hat 9.0 (gcc and icc 8.1)
Suse (gcc 3.3.1)
Suse (gcc 4.1.0)
Debian (gcc 3.2.3)
Fedora Core 2 (gcc 3.3.3)
Fedora Core (gcc 4.0 )
Fedora Core (gcc 4.1.0)
Gentoo (gcc 4.1.0)
SL 3-4
64 bit architectures
Binaries are also available for these platforms
CHEP07 5 september