hadronic physics validation ii dennis wright geant4 review cern 16-20 april 2007
TRANSCRIPT
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Hadronic Physics Validation II
Dennis WrightGeant4 Review
CERN16-20 April 2007
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Outline
● Full setup/thick target validations– head-to-head comparison with other MC codes
● Checking conservation laws– user requests
– model limitations
● Other efforts● Making other codes available within Geant4
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Inter-comparison with Other Codes
● 7 validation tests proposed for Hadronic Shower Simulation Workshop at Fermilab, September 06 – covered wide energy range– head-to-head comparison of (5-6) simulation codes for
each test– data sets agreed upon beforehand– voluntary participation
● Due to short time scale, not all tasks could be completed
● Agreed to make this a regular exercise
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Task 1: 12.9 GeV/c p on Al
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Task 1: 12.9 GeV/c p on Al
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Task 1: 12.9 GeV/c p on Al
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Task2a: + from 158 GeV/c p on C
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Task2a: from 158 GeV/c p on C
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Editor: S. Striganov, Fermilab
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Task2a: + from 158 GeV/c p on C(Geant4 only - QGSP)
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Task3: p + Al at 67 GeV/c -> + Xred: Geant4, blue: MARS, green: PHITS
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Task3: p + Al at 67 GeV/c -> Xred: Geant4, blue: MARS, green: PHITS
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Task 3: p + Al at 67 GeV/c -> p Xred: Geant4, blue: MARS, green: PHITS
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Geant4is version 8.1and QGSP
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p + Al at 67 GeV/c -> p X (FTFP in v8.2 ref02)
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p
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Task4: PAL with Geant4 prediction
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Task 5: Total Energy in a Cu Absorber
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Ed. S. Striganov, Fermilab
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Task 7: Energy Deposited in W Rod
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Ed. S. Striganov, Fermilab
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Checking Conservation Laws● User requests
– common complaint: excess energy produced in LEP, HEP, QGS models
– response: some excesses can be fixed, others inherent in model
● Energy/momentum conservation– tests now in place to check for non-conservation
– QGS model: all known energy/momentum non-conservation has been fixed
– LEP, HEP: some non-conservation fixed, some left for new model
● Charge, strangeness conservation – LEP, HEP models inherently violate charge conservation
– can fix only by going to new model 17
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Energy deposited by 1 GeV n-bars in steel calorimeterBlue: before fix Red: after fix
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Other Efforts (1)● Quasi-elastic (charge exchange) reactions
– validation of n-A interactions showed that the GHEISHA-derived elastic process had many problems
– some of these were corrected but the cross sections are still incorrect and there is double-counting of quasi-elastic reactions
– original GHEISHA code did not neatly separate charge exchange and elastic
– some problems may have been introduced in conversion to C++
● Separate quasi-elastic process being considered– separate cross section data set required (n-n easy, n-A more
difficult)
– charge-exchange would have to separated from some models which now include it to avoid double-counting 19
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Other Efforts (2)● Physics list validations
– done in consultation with EM group
– 4-5 most used physics lists regularly checked
● Beginning development of new validation suites– similar to cascade, CHIPS model verification test suites
– for cross sections, medium energy models, high energy models
● Regular generation of HSSW validations– add new tasks
– repeat every 18 months
● Application validations– specific tests in medical, space and HEP fields
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Making Other Hadronic Codes Available Within Geant4
● INCL/ABLA– interface available – currently being incorporated into Geant4
● completion by end of this year● JQMD
– interface for nucleus-nucleus collisions available● Lawrence Livermore Neutron Database
– currently working with LLL on alternative to HP neutron models
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Making Other Hadronic Codes Available Within Geant4
● DPMJET– interface being developed for nucleus-nucleus collisions– ready by Autumn 2007
● MARS– part of older version of MARS (MARS13) (E < 5 GeV)
available in Geant4 (parameterized, no CEM)– to be discontinued in Geant4 9.0 (lack of use, obsolete)– new version not available for incorporation or interface at
this time
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Making Other Hadronic Codes Available Within Geant4
● Currently no plans to develop interface for FLUKA or MCNP(X)– these are not simply models but full simulation packages– some license issues involved as well
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Backup slides
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Open Issues (1)● Current validation practice:
– problems identified (shower shape, neutron fluence, etc.)
– compare/validate the applicable physics lists using full setup results
– verify that the critical models in the physics lists are working properly by comparing to thin target data
● The above practice:– has identified several problems which are now being fixed
– ensures that the most-used physics lists and models are more thoroughly validated
– tends to neglect other physics lists, models, energy ranges
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Open Issues (2)● Development of a comprehensive validation strategy
– ideally, each physics model, physics list would be validated for each release
– not practical given current hadronic group manpower
● Presenting validation results to users– too much to present (confusing to users?)
– some validation data is pending publication and cannot be made public
● Archiving, accessing older validations– organization, centralization
– large number of files
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Open Issues (3)● Participate in more inter-code validation comparisons
– not many Geant4 people expert at using other codes, and vice versa
– due to HSSW, there will be more full setup comparisons but model-to-model comparisons will be difficult
● Finding time/manpower to do validation for “stable models”
– codes such as precompound, de-excitation, etc. have not undergone recent development, and have not been recently validated
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Task6: - in Fe-Scint Calorimeter
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