ESA Space Physics List: Unification of Physics Configurations of GRAS and MULASSIS

Transcription

1 ESA : Unification of Physics Configurations of GRAS and MULASSIS V. Ivanchenko 1,2, F. Lei 3, G. Santin 4 1 CERN, Geneva, Switzerland 2 EMSU, Moscow, Russia 3 QinetiQ, Famborough,, United Kindom 4 ESTEC, ESA, Noordwijk,, The Netherlands 4 th Geant4 Space Users Workshop 6-10 November, Pasadena, California, U.S.A.

2 Outline Introduction MULASSIS/GRAS Main Components of Physics List Models per G4Region Perspectives Conclusions 7 November 2006 V.Ivanchenko 2

3 Introduction Physics List was assumed to be the user component LHC experiments required well define physics configuration Reference Physics Lists Space applications require more flexible solution 7 November 2006 V.Ivanchenko 3

4 MULASSIS MUlti-LAyered Shielding SImulation Software (Fan Lei, Peter Truscott) QinetiQ BIRA First Geant4 web interface Is available since D simulation successfully used for many applications 7 November 2006 V.Ivanchenko 4

5 MULASSIS Physics Electromagnetic physics Standard Low-Energy Livermore Low-Energy Penelope Radioactive decay Hadronic Physics LHEP or QGS for high energy Binary Cascade for hadrons and ions Abrasion model for ions Abrasion+Ablation models for ions 7 November 2006 V.Ivanchenko 5

6 GRAS: 3D General Purpose Tool for Space Applications GDML main Modular design I geometry GRAS Analysis Run Module description tool GRAS Action Run GRAS Manager Analysis Modular Physics list Event Module Action Analysis GRAS Manager User actions via Tracking Analysis Action Module Analysis Modules GRAS Stepping Analysis Action Module Generic histograms No analysis User do not need at this level type c++ code! GRAS - G.Santin - Geant4 Collaboration Workshop, Catania, 4-9/10/ November 2006 V.Ivanchenko 6

7 GRAS Physics Reorganization of GRAS Physics List during migration to G4 8.0 (GRAS 1.0) The choice is provided: to combine Physics List from components to use predefined Physics List from G4 distribution New features: Step limit per region Activation of PAI model per region Printout of cross sections or stopping powers per material of interest 7 November 2006 V.Ivanchenko 7

8 MULASSIS/GRAS Physics List Major design changes have been introduced in G4 8.0: Particle category redesign Modification of predefined Physics Lists Application Physics Lists should be updated MULASSIS Physics List had serious problems with G4 8.0 The prototype of utilization of GRAS physics components inside MULASSIS was done for G4 8.0 The main requirement: No change in the user interface 7 November 2006 V.Ivanchenko 8

9 Category Diagram MULASSIS GRAS PI Geant4 GDML CLHEP Data GL VRML XercesC 7 November 2006 V.Ivanchenko 9

10 GRAS/MULASSIS Unified Physics GRAS infrastructure is more complicate Approximately 10 times more lines of code Physics classes of GRAS are well separated from other software Current solution: physics classes of GRAS are copied to MULASSIS Simplification of MULASSIS configuration Some delay between reference tags for GRAS and MULASSIS The same components are shared by both tools 7 November 2006 V.Ivanchenko 10

11 GRAS Status Release GRAS 1.4 is based on G4 8.1p01 Will be available this month Web page with the documentation env.esa.int/r_and_d/gras Software will be distributed from the web this month 7 November 2006 V.Ivanchenko 11

12 dσ/de[mb/mev] Why Different Hadronic Options? Neutron spectra by 256 MeV protons Binary and Bertini Cascades 8.1 neutron yield by 256 MeV protons Binary Cascade Be Al Fe - Pb E kin [MeV] dσ/de[mb/mev] neutron yield by 256 MeV protons Bertini Cascade Be Al Fe - Pb E kin [MeV] 7 November 2006 V.Ivanchenko 12

13 Why Different Hadronic Options? Neutron spectra by 0.8 and 1.5 GeV protons November 2006 V.Ivanchenko 13

14 GRAS 1.4 Physics List Default: EM Standard + decay Predefined from G4 configuration: LHEP QGSP QGSP_BIC QGSP_BERT QGSP_BERT_HP QGSC QBBC QBBC_HP Cover main options of G4 hadronics 7 November 2006 V.Ivanchenko 14

15 GRAS Hadronic Physics Configuration # Physics Lists from Components decay raddecay # Hadronic physics components elastic gamma_nuc # Hadronic physics components binary binary_hp bertini bertini_hp # Ion physics options binari_ion Abrasion Abrasion+Ablation 7 November 2006 V.Ivanchenko 15

16 Why Different EM Options? Different limits on model applicability Different limits on cut values Different CPU performance GRAS provide a possibility to replace default standard EM physics in reference Physics Lists by other configurations 7 November 2006 V.Ivanchenko 16

17 EM Physics Configuration # Can be applied on top of any configuration # Main options em_standard em_standard52 em_standard71 em_lowenergy # em_standard is default # em_penelope is hold # Cuts and step limits /gras/phys/setcuts 0.1 mm /gras/phys/setcutg 0.1 mm /gras/phys/setcute 1.0 mm /gras/stepmax 0.1 mm /gras/phys/cutslowenergylimit 0.01 kev 7 November 2006 V.Ivanchenko 17

18 Why Physics per Region is needed? Different requirements to simulation of different sub-devices Available options per G4Region: Cuts Sub-cutoff option Standard models (PAI) Foreseen option: Single scattering with sampling of a recoil 7 November 2006 V.Ivanchenko 18

19 GRAS EM Options Per Region # Define region /gras/physics/region/addregion ABSORBER # Add volume to the region /gras/physics/region/addvolumetoregion Vol1 ABSORBER # Define cuts and step limits /gras/phys/setcuts 0.1 mm /gras/stepmax 0.1 mm # Define cuts and step limits per region /gras/regionstepmax ABSORBER 0.2 mm /gras/physics/region/setregioncut ABSORBER all 0.1 mm # define PAI model per region /gras/physics/paiforregion e- ABSORBER PAI 7 November 2006 V.Ivanchenko 19

20 Perspectives For the Geant4 release 8.2 physics_lists subdirectory is moved into the Geant4 source tree No problems for GRAS/MULASSIS Configuration of GRAS will be simpler We can foresee more options for EM physics in near future 7 November 2006 V.Ivanchenko 20

21 Conclusions The same modular Physics List is provided for GRAS and MULASSIS tools Number of reference Physics Lists are available Additional options for EM and hadronic physics are provided Can be shared by other space tools 7 November 2006 V.Ivanchenko 21