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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSim
R3B simulations status
Héctor Alvarez Pol GENP, Univ. Santiago de Compostela
R3BSim developers H. Alvarez Pol (USC), S. Beceiro (USC), M. Cherciu (ISS Bucharest),
B. Fernández (Univ. Liverpool), O. Kiselev (GSI), M. Labiche (Univ. Paisley), S. Paschalis (Univ. Liverpool), M. Potlog (ISS Bucharest), C. Rodríguez Tajes (USC)
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSim
1. R3BSim status2. LAND simulations 3. TPC simulations
INDEX
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimR3BSim: overview
R3BSim is a simulation code for the R3B setup, also useful for present Cave C experiments✔ By now, a pure GEANT 4 + ROOT program✔ Features a multihit data structure ready for eventloop analysis✔ A modular geometry description allows the integration of new detectors
R3BSim features:✔ A large set of materials is included both for the crystal and the environment; for the crystals: LaBr
3, CsI, NaI, PWO, BGO...; for the environment: air, vacuum...
✔ Messenger commands for user control (online)✔ Data structure and persistency classes modularized✔ ROOT libraries included for a fully integrated analysis interface✔ Partially documented (code is written in OO/C++ style, that is, readable ;)
R3BSim provides a new data structure✔ All detectors in a single TTree with individual branches per detector✔ Branches made of TClonesArray (collections) of detector Hits✔ Full access to the filling of the Hit information Examples, README, HOWTO files available
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimPhysics lists and event generators
Physics lists: a whole world of particles and interactions (enjoy it!) ✔ G4 allows and enforces a full customization of the physics description ✔ Available Physics lists ✔ Electromagnetics: standard, low energy, penelope✔ Hadronic: some basic processes could be directly started from the macro; any physics list can be compiled within the code =>
Event generators ✔ Present version of R3BSim lacks of real physical event generators ✔ Ongoing work: quasielastic, knockout (p,2p), charge exchange... are under development (Milano, Madrid, UK, GSI, ...)✔ Discussions ongoing about a common interface for nuclear physics✔ Problems with known physics event interfaces due to particle ID scheme
So, what is in?✔ Gamma source for testing calorimeter (Lorentz boost, realistic target interaction,... included) ✔ Proton basics elastic scattering and transfer reactions for testing ✔ Whatever particle (or set of) that the user wants to throw in
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimDetectors in R3BSim: Silicon tracker
Silicon tracker✔ Octogonal geometry for R3B✔ Geometry for test experiments under development (BF, ML)✔ Geometrical description and digitization scheme under discussion
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimDetectors in R3BSim: CALIFA geometry
Available geometries in R3BSim:✔ v1.2 initial design as described in R3B_CAL_01/05✔ v4.0b presented by J.Peyre at Orsay Cal WG meeting✔ v4.0b with corrected lengths for the crystals
Crystal length selection (v4.0b):✔ Three calorimeters with different crystal size combinations have been simulated (SHORT, MEDIUM, LONG)✔ For each calorimeter, lengths are selected to cover approx. the same photopeak efficiency @ 5MeV CoM✔ Overlap problems, corrected in simulation (temporal solution)
Three different models: Short, Medium and Large Energy 700 AmeV Chosen for approx. 60%, 70% and 80% PE @ 5MeV CoM10 15 20 25 30 35 45 55 65 90 120 Angle (deg)
2.97 2.75 2.49 2.23 1.97 1.74 1.36 1.08 0.88 0.57 0.41 E_lab/E_CM14.85 13.75 12.45 11.15 9.85 8.7 6.8 5.4 4.4 2.85 2.05 E_lab for 5 MeV CM1.32 1.25 1.2 1.14 1.1 1.05 1.01 1 0.99 0.95 0.8 Approx. Multiplicative factor
Short 15 14 13 13 12 12 11 11 11 10 9 Crystal length (cm)Medium 18 18 17 16 15 15 14 14 14 13 11Long 22 21 20 19 19 18 17 17 17 16 14
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimDetectors in R3BSim: DarmstadtHeidelberg Crystal Ball
DarmstadtHeidelberg Crystal Ball ✔ Based on GEANT3 geometry description✔ Some problems detected on G3 geometry corrected (scaling) ...✔ ... A better description could be implemented in next future (SB)✔ Report on the translation G3 to G4 in /u/land/geant4/R3B/techReport.pdf
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimDetectors: Drift chambers
Drift chambers ✔ A simple gas volume ✔ Aluminum frames and mylar windows are now in ✔ A simple digitization scheme already working✔ A more elaborate scheme under development ✔ Realistic output (based on the existing cell/layer structure)
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimDetectors: GFI and TOF walls
GFI ✔ A simple scintillator volume with frames✔ A simple digitization scheme already working✔ Some work to do ...
TOF walls✔ MiniTOF (ions) and protons TOF wall under implementation
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimOther setup elements: magnets, targets...
Magnets ✔ ALADIN implemented✔ R3B magnet implemented (geometry not included, only field map)✔ Both cases based on interpolation of the field map with different grids
Targets✔ Parafin targets (0o and 45o)✔ LiH target✔ Easy implementation of new geometries
Primary information✔ Stored in the TTree for later access during the analysis ✔ Full information about all primaries (vertex particles)
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimR3B LAND simulations
Reported by M. Potlog:✔ Tests trying to understand neutron interaction in Geant4✔ Comparison with Saturne experiments (scintillator paddles on neutron beam)✔ Bertini QGSP_BERT_HP and Binary QGSP_BIC seems to have the proper high energy neutron interactions✔ Still a large difference with the exp. data✔ Individual physics processes under test
FLUKA (M. Cherciu):✔ Implementation of the Saturne test geometry✔ Comparison made for 200MeV neutrons✔ Ongoing work for 500MeV and 1GeV
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimR3B LAND simulations
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimR3B TPC simulations
Reported by K. KezzarAlready done tasks:✔ Study the geometry of the detector✔ Tracks reconstruction of fragments (using spallation events as input)✔ Signal reconstruction in the detection planesPresent work (in parallel with testing prototypes):✔ Study the possibility of multiplexing in order to reduce the number of channels A more complete report will be ready beginning of March
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimR3BSim – Conclusions
R3BSim is a working simulation program for R3B and cave C experiments: describes part of the present detectors simple analysis macros available for calorimeter only, easily expanded under test; developers and betatesters neededMore info: www.usc.es/genp/r3b
LAND detector sim: Physics Lists studies using Saturne tests; geometryTPC detector sim: geometry and track reconstruction ready
Ongoing or future developments: complete Cave C setup improve description on relevant detectors; detector integration event generator should be soon incorporated; waiting for physics......
http://www.usc.es/genp/r3b
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimExample: Calorimeter analysis Lorentz boost effects
Simulation for Miniball @ FRSS245 – 23O breakup @ 700 AMeV– 1 n removal
(22O decay scheme)
The very low efficiency at high energy makes very difficult to reconstruct the 3.2 MeV peak
Perfect Doppler correction
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimExample: R3B Calorimeter vs. MINIBALL
G4double distribution = RandFlat::shoot(0.,183.); if(distribution < 100.) GammaEnergy = 3199.; //100% else if(distribution < 146.) GammaEnergy = 1383.; //46% else if(distribution < 147.6) GammaEnergy = 1710.; //1.6% else if(distribution < 166.6) GammaEnergy = 2601.; //19% else GammaEnergy = (RandFlat::shoot(0.,5000.))*keV; //~10% if(distribution < 166.6) //transform into lab frame else //no Lorentz boost
Other cases requested for simulation: decays at lower energies dipole resonances ...
CALIFA
MINIBALL
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimExample: Cave C – next year experimental setup
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSimHow to run R3BSim @ GSI
A fast guide to R3BSim at GSI (linux cluster, Debian 3.1) ✔ R3BSim v0.3 available (CB in, but not yet DCH, ALADIN ...) ✔ New “stable” versions will be available as soon as produced ✔ Ugh, I cannot wait for a stable version!
So, download it from subversion repository for developers/testers (ask me for passwd)
How to:✔ Log as land ✔ Run configuration script ✔ Move to /u/land/geant4/R3B/R3BSim✔ You are ready for running R3BSim✔ More details in report:/u/land/geant4/R3B/techReport.pdf
Some macros for:✔ Testing the CB✔ Testing the full set of detectors✔ Testing the R3B calorimeter✔ Soon also for ALADIN setup
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSim
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H. Alvarez Pol – R3BSim status Valencia, 19 February 2007
R3BSim