Large Installation Experiment Geant4 Simulations: SBS, SoLID, Moller

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1 Large Installation Experiment Geant4 Simulations: SBS, SoLID, Moller Seamus Riordan University of Massachusetts, Amherst December 18, 2013 Seamus Riordan Analysis 2013 Big Simulations 1/19

2 Code Availability Everything has been migrated to github and in the JeffersonLab organization Publically available, Ole can grant push access, but small fixes should go through fork/pull push requests Lots of projects available at pretty much every level If you see something you can use, take it Seamus Riordan Analysis 2013 Big Simulations 2/19

3 Issues and Motivation Hall A large installation experiments need very detailed simulations to address lots of experimental issues Projects are typically bigger than for a single developer, many subsystems involved Frequently tackling the same issues, sharing and developing coherently can be productive Each experiment has its individual needs Teardown and rebuild for something of these sizes can be a good development model Packages available now for SBS, Moller, SoLID Seamus Riordan Analysis 2013 Big Simulations 3/19

4 remoll Framework Everything is local - no external servers Output goes directly to ROOT Input (including geometry) entirely in text files - everything (along with environment, build versions, etc) is stored with output Geometry specified through GDML - have written scripts to generate based on parameters Use cmake system, don t be demanding on requiring packages Include generators in code Store in git repository - build version/info goes to output January, tore down old Moller framework and started from scratch Seamus Riordan Analysis 2013 Big Simulations 4/19

5 Conceptual Organization MagneticField GDML DetectorConstruction VEventGen Detector EventAction Messenger PrimaryGenerator Moller pelastic Pion Event IO Aggregation BeamTarget Compile time and version information ROOT Output Macro Seamus Riordan Analysis 2013 Big Simulations 5/19

6 Versioning Implemented ability to track version that was built Use git as respository base Information at build is hardcoded into binary: git last revision log information git commit hash Entire run macro Geant4 version built against ROOT version built against cmake version used Build date remoll source directory build directory All GDML files are stored in ROOT file in special object Separate library to be loaded with ROOT created at build Seamus Riordan Analysis 2013 Big Simulations 6/19

7 Recreation Say you want to recreate your Geant4 build results root [1].ls TFile** remollout_ep_6.root TFile* remollout_ep_6.root KEY: TTree T;1 Geant4 Moller Simulation KEY: remollrundata run_data;1 root [2] run_data->print() git repository info commit 8a5fff7008edeb3543c7899da86c67bbe5eb1856 Merge: 818f e2d Author: Seamus Riordan Date: Tue Mar 5 14:19: Merge branch master into optical ## optical Seamus Riordan Analysis 2013 Big Simulations 7/19

8 Recreation git checkout 8a5fff7008edeb3543c7899da86c67bbe5eb1856 will restore to that version To extract built GDML files root [3] run_data->recreategdml() or root [3] run_data->recreategdml("new path") Seamus Riordan Analysis 2013 Big Simulations 8/19

9 Generators Generators are amalgamation of what we ve used in the past Prevertex external radiation, MS included Moller ep elastic Internal radiation included DIS with A PV CTEQ 6 standalone C implementation - no external library required Inelastic (Christy/Bosted) Ported to C, could include A PV π +/, K +/,p Wiser code (EPA) - ported to C Hyperons forthcoming, groundwork laid by Konrad Aniol Seamus Riordan Analysis 2013 Big Simulations 9/19

10 Generators - Common Generators all have access to following additions Initial radiative effects Single function for all generators Can bypass if necessary Initial multiple scattering Methods to determine material Stand-alone, validated multiple scattering code avaiable Seamus Riordan Analysis 2013 Big Simulations 10/19

11 remoll for SoLID SoLID has many of the same issues Have proposed migrating, but very big job Having single simulation with all present development work very enticing Seamus Riordan Analysis 2013 Big Simulations 11/19

12 remoll for SoLID - Work done, to do Only PVDIS so far, SIDIS J/Ψ need attention Tank, mirrors, PMTs, optical properties for Cerkenov exist - used Michael Paolone s code to create Need to position correctly Need to validate responses Hexagonal preshower/shower implemented - used Jin Huang s code to create Rakitha Beminiwattha has been checking Has standard Geant4 GUI, would like something nicer - GEMC has a nice implementation Seamus Riordan Analysis 2013 Big Simulations 12/19

13 qsim - remoll light Ported PREX quartz simulation code to clean up framework Build and ROOT output similar to remoll Detector construction class hardwired Includes simple detectors Useful for quick Geant4 development? Seamus Riordan Analysis 2013 Big Simulations 13/19

14 Super BigBite SBS has similar issues, but is a many configuration design Static GDML is more irritating to work with g4sbs simulation older than remoll - probably due for recasting Need G p E, G E n, G M n, An 1, SIDIS, etc Seamus Riordan Analysis 2013 Big Simulations 14/19

15 Target/Target Chamber Windows designed to match acceptance of cryo-target experiments Need to produce snout to hadronic side Target cell given by design from Silviu Corvig SolidWorks Educational Edition. For Instructional Use Only. Needs work and iteration with engineers Seamus Riordan Analysis 2013 Big Simulations 15/19

16 Field Clamps and 48D48 Field clamps taken from model in TOSCA Windows for beampipe modified slightly to fit configurations Cuts in magnet taken from TOSCA, add in cut for Ecal acceptance Seamus Riordan Analysis 2013 Big Simulations 16/19

17 Detector Stacks Detector stacks implements No GEM or calorimeter responses, just hits at the moment GEMs do tracking - used to evaluate optics resolution Seamus Riordan Analysis 2013 Big Simulations 17/19

18 Work To Do Continue to iterate geometries, analysis Shielding Clamps/48D48 Beamline/target chamber GEM construction Look at acceptances with new configuration Ensure no overlapping geometries Maintain/improve codebase Import remoll-style IO, generators Pre-vertex radiative effects and multiple scattering missing Adapt so has output trees compatible with SBS GEM response code? Seamus Riordan Analysis 2013 Big Simulations 18/19

19 Summary Lots of progress in large installation experiments this year remoll offers useful features when dealing with a complicated system SoLID has been roughed out in present framework - could yield something greater SBS simulation has different needs, still under active development Seamus Riordan Analysis 2013 Big Simulations 19/19

20 Field Clamps Q 2 = 5 GeV 2 Q 2 = 12 GeV 2 Seamus Riordan Analysis 2013 Big Simulations 19/19