recent and on-going developments in kernel makoto asai (slac) 4 th geant4 space users’ workshop...

Recent and on-goingRecent and on-goingdevelopmentsdevelopments

in Kernelin Kernel

Makoto Asai (SLAC)Makoto Asai (SLAC)

44thth Geant4 Space Users’ Geant4 Space Users’ WorkshopWorkshop

November 6November 6thth, 2006, 2006

http://www-unix.oit.umass.edu/~blaylock/hepex/sm-text-logo.gif

Recent and on-going developments in kernel - M.Asai (SLAC)Recent and on-going developments in kernel - M.Asai (SLAC) 22

ContentsContents

New features in geometryNew features in geometry

New features in kernel and detector responsesNew features in kernel and detector responses

New Geant4 licenseNew Geant4 license

Planned new features in December releasePlanned new features in December release

Recent and coming releasesRecent and coming releases

Dec 16Dec 16thth, ’05 - Geant4 version 8.0 release, ’05 - Geant4 version 8.0 release

Feb 10Feb 10thth, ’06 - Geant4 8.0-patch01 release, ’06 - Geant4 8.0-patch01 release

June 30June 30thth, ’06 - Geant4 version 8.1 release, ’06 - Geant4 version 8.1 release

July 27July 27thth, ’06 - Geant4 8.1-patch01 release, ’06 - Geant4 8.1-patch01 release

Nov 10Nov 10thth, ’06 - Geant4 8.1-patch02 release (scheduled), ’06 - Geant4 8.1-patch02 release (scheduled)

Dec 15Dec 15thth, ’06 - Geant4 version 8.2 release (scheduled), ’06 - Geant4 version 8.2 release (scheduled)

New features in geometryNew features in geometryNew shapesNew shapes

New overlap checkingNew overlap checkingNested parameterized volumeNested parameterized volume

Tessellated solidTessellated solidGDMLGDML


Geometry modeler - 8.0Geometry modeler - 8.0 New shapes:

Ellipsoid, elliptical cone, tetrahedra

Generation of random points on surfaces

For all combination of solids, including Boolean

operations

Detection of overlaps at placement/construction of

volumes

Activated optionally in the constructor or on-demand

afterwards


Detection of OverlapsDetection of Overlaps Existing techniques on Existing techniques on constructedconstructed geometry geometry

Grids overlap (built-in UI commands)Grids overlap (built-in UI commands) Uses solids response and trackingUses solids response and tracking

DAVID toolDAVID tool Using polyhedron graphical representationUsing polyhedron graphical representation

OLAP toolOLAP tool Verifying tracking response through raysVerifying tracking response through rays


Detection of Overlaps - 2Detection of Overlaps - 2 Check overlaps at construction (since 8.0)Check overlaps at construction (since 8.0)

Applicable to placement and parameterized volumesApplicable to placement and parameterized volumes Applicable for assemblies and reflectionsApplicable for assemblies and reflections Verifies placement of a single volume against the existing Verifies placement of a single volume against the existing

placed volumesplaced volumes Activating a flag in the constructor, orActivating a flag in the constructor, or Using explicit Using explicit CheckOverlaps(int res=1000)CheckOverlaps(int res=1000) method method Generates Generates resres points on surface (1000 as default) points on surface (1000 as default)

Allows for easy checks for misalignmentsAllows for easy checks for misalignments


Optional checks at constructionOptional checks at construction Constructors of Constructors of G4PVPlacementG4PVPlacement and and G4PVParameterisedG4PVParameterised have an have an

optional argument “pSurfChk”.optional argument “pSurfChk”.

G4PVPlacement(G4RotationMatrix* pRot,G4PVPlacement(G4RotationMatrix* pRot,const G4ThreeVector &tlate, const G4ThreeVector &tlate, G4LogicalVolume *pDaughterLogical, G4LogicalVolume *pDaughterLogical, const G4String &pName, const G4String &pName, G4LogicalVolume *pMotherLogical, G4LogicalVolume *pMotherLogical, G4bool pMany, G4int pCopyNo, G4bool pMany, G4int pCopyNo, G4bool pSurfChk=falseG4bool pSurfChk=false); );

If this flag is true, overlap check is done at the construction.If this flag is true, overlap check is done at the construction. Some number of points (default 1000) are randomly sampled on Some number of points (default 1000) are randomly sampled on

the surface of creating volume.the surface of creating volume. Each of these points are examinedEach of these points are examined

If it is outside of the mother volume, orIf it is outside of the mother volume, or If it is inside of already existing other volumes in the same If it is inside of already existing other volumes in the same

mother volume.mother volume. This check requires lots of CPU time, but it is worth to try at least once This check requires lots of CPU time, but it is worth to try at least once

when you implement your geometry of some complexity.when you implement your geometry of some complexity.


Geometry modeler - 8.1Geometry modeler - 8.1 Extensions to G4AssemblyVolumeExtensions to G4AssemblyVolume

To support assemblies of assembliesTo support assemblies of assemblies To support reflected volumesTo support reflected volumes To allow for overlaps check at construction also for To allow for overlaps check at construction also for

reflectionsreflections To allow for access to constituent volumes To allow for access to constituent volumes

Nested parameterized volumes Special construction for multi-dimensional

parameterizations First implementation of tessellated solidsFirst implementation of tessellated solids

Volumes defined by triangular or Volumes defined by triangular or quadrangular facetsquadrangular facets

Allowing import/export of shapesAllowing import/export of shapeswith CAD systemwith CAD system


Tessellated solidsTessellated solids G4TessellatedSolidG4TessellatedSolid (since 8.1) (since 8.1)

Generic solid defined by a number of facets (Generic solid defined by a number of facets (G4VFacetG4VFacet)) Facets can be triangular (Facets can be triangular (G4TriangularFacetG4TriangularFacet) or ) or

quadrangular (quadrangular (G4QuadrangularFacetG4QuadrangularFacet) ) Constructs especially important for conversion of complex Constructs especially important for conversion of complex

geometrical shapes imported from CAD systemsgeometrical shapes imported from CAD systems But can also be explicitly defined:But can also be explicitly defined:

By providing the vertices of the facets in By providing the vertices of the facets in anti-clock wiseanti-clock wise order, in order, in absoluteabsolute or or relativerelative reference frame reference frame

GDML bindingGDML binding

A CAD imported assemblywith tessellated solids - release 8.1


GDML - MotivationGDML - Motivation

initially developed as an alternative geometry description format for initially developed as an alternative geometry description format for Geant4Geant4 to move away from hard-coded geometryto move away from hard-coded geometry

to allow flexible geometry configuration without the need to to allow flexible geometry configuration without the need to recompilerecompile

now, playing also an important role of geometry interchange formatnow, playing also an important role of geometry interchange format application independentapplication independent

same GDML file can be used by several applicationsame GDML file can be used by several application possibility to export geometries from experiment-specific possibility to export geometries from experiment-specific

frameworksframeworks allows physics validation/comparison, visualization, debuggingallows physics validation/comparison, visualization, debugging


GDML componentsGDML components GDML is defined through XML Schema (XSD) GDML is defined through XML Schema (XSD)

XSD = XML based alternative to XSD = XML based alternative to Document Type Definition (DTD) Document Type Definition (DTD)

defines document structure and the list of defines document structure and the list of legal elementslegal elements

XSD are in XML -> they are extensibleXSD are in XML -> they are extensible

GDML can be written by hand or generated GDML can be written by hand or generated automatically automatically 'GDML writer' allows writing-out GDML file'GDML writer' allows writing-out GDML file

GDML needs 'reader'GDML needs 'reader' 'GDML reader' creates 'in-memory' 'GDML reader' creates 'in-memory'

representation of the geometry representation of the geometry descriptiondescription

GDMLSchema

GDML file

user application (1)

GDML writer

GDML reader

user application (2)


GDML Geant4 bindingGDML Geant4 binding package available from package available from www.cern.ch/gdmlwww.cern.ch/gdml

latest release GDML_2_8_0 tested with G4.8.1.p01latest release GDML_2_8_0 tested with G4.8.1.p01 autoconf/make based build systemautoconf/make based build system requires XercesC parser (tested with versions 2.3.0 and requires XercesC parser (tested with versions 2.3.0 and

2.7.0)2.7.0) could be (in the future) integrated more with G4 distributioncould be (in the future) integrated more with G4 distribution

optional package to be linked against during buildoptional package to be linked against during build GDMLDetectorConstruction class providedGDMLDetectorConstruction class provided geometry exportation in GDML steered by UI command?geometry exportation in GDML steered by UI command?

http://www.cern.ch/gdml


Modular geometry filesModular geometry files support for modular support for modular

GDML geometriesGDML geometries several standalone several standalone

GDML files can now GDML files can now be combined be combined together within together within another 'top level' another 'top level' GDML fileGDML file

GDML writer can now GDML writer can now split geometry in split geometry in modulesmodules

LHCb

HCal Ecal Muon ...

Module1 Module2 ...

NEW


CAD(STEP) -> GDML converterCAD(STEP) -> GDML converter

ST - ViewerAn interactive tool for viewing

3D CAD information

STEP filesST – Viewer uses an internalfile format (.geom & .tree)

to store geometry info

STEPGDMLLibrary functions created

to convert STEP filesinto GDML files

GDML Output File Equivalent to the original STEP file

Contains only tessellated solids

• 'first order' approach to use CAD geometries for Geant4 simulation

NEW


CMS detector: G4->GDML->ROOTCMS detector: G4->GDML->ROOT

snapshot provided by R.Maunder

thanks to Pedro Arce for help with running CMS

simulation

~19000 physical volumes


LHCb Detector: G4->GDML->ROOTLHCb Detector: G4->GDML->ROOT

snapshot provided by R.Maunder

~5000 physical volumes


Using GDML with Geant4Using GDML with Geant4to write:to write:

#include "WriterG4/G4GDMLWriter.h"#include "WriterG4/G4GDMLWriter.h"

G4GDMLWriter g4writer("GDMLSchema/gdml.xsd", "g4test.gdml");G4GDMLWriter g4writer("GDMLSchema/gdml.xsd", "g4test.gdml");

g4writer.DumpGeometryInfo(g4worldvolume);g4writer.DumpGeometryInfo(g4worldvolume);

to read:to read:

SAXProcessor sxp;SAXProcessor sxp;sxp.Initialize();sxp.Initialize();ProcessingConfigurator config;ProcessingConfigurator config;config.SetURI( "g4test.gdml" );config.SetURI( "g4test.gdml" );sxp.Configure( &config );sxp.Configure( &config );

sxp.Run()sxp.Run()

fWorld = (G4VPhysicalVolume *)fWorld = (G4VPhysicalVolume *)GDMLProcessor::GetInstance()->GetWorldVolume();GDMLProcessor::GetInstance()->GetWorldVolume();

instantiate GDML writer

pass the 'top' volume to the writer

instantiate and configure the processor

get pointer to 'top' volume

GDML example in examples/extended/gdml


GDML processing - performanceGDML processing - performance GDML G4reader/G4writer (C++) tested on GDML G4reader/G4writer (C++) tested on

complete LHCb and CMS geometriescomplete LHCb and CMS geometries parts of ATLAS geometryparts of ATLAS geometry

problem with full ATLAS geometry - use of custom problem with full ATLAS geometry - use of custom solidssolids

for LHCb geometry for LHCb geometry (~5000 logical volumes)(~5000 logical volumes) writing out ~10 seconds (on P4 2.4GHz)writing out ~10 seconds (on P4 2.4GHz) reading in ~ 5 secondsreading in ~ 5 seconds file size ~2.7 Mb (~40k lines)file size ~2.7 Mb (~40k lines)

for CMS geometry for CMS geometry (~19000 logical volumes)(~19000 logical volumes) writing out ~30 secondswriting out ~30 seconds reading in ~15 secondsreading in ~15 seconds file size ~7.9 Mb (~120k lines)file size ~7.9 Mb (~120k lines)


GDML as primary geometry sourceGDML as primary geometry source Linear Collider - Jeremy McCormick, SLACLinear Collider - Jeremy McCormick, SLAC

Linear Collider Detector Description (LCDD) Linear Collider Detector Description (LCDD) extends GDML with Geant4-specific information extends GDML with Geant4-specific information (sensitive detectors, physics cuts, etc)(sensitive detectors, physics cuts, etc)

GDML/LCDD is generic and flexibleGDML/LCDD is generic and flexible several different full detector design several different full detector design

concepts, including SiD, GLD, and LDC, concepts, including SiD, GLD, and LDC, where simulated using the same applicationwhere simulated using the same application

SiD

GLDLDC


GDML as primary geometry sourceGDML as primary geometry source Space Research - Giovanni Space Research - Giovanni

Santin, ESASantin, ESA all geometry models for all geometry models for

Geant4Geant4 component degradation component degradation

studies (JWST, studies (JWST, ConeXpress,...)ConeXpress,...)

GRAS (Geant4 Radiation GRAS (Geant4 Radiation Analysis for Space)Analysis for Space)

enables flexible geometry enables flexible geometry configuration and changesconfiguration and changes

main candidate for CAD to main candidate for CAD to G4 exchange formatG4 exchange format

ConeXpress

JWST NIRSpec


GDML as primary geometry sourceGDML as primary geometry source Anthropomorphic Phantom Anthropomorphic Phantom

Project - Giorgio Guerrieri, Project - Giorgio Guerrieri, Maria Grazia Pia, Susanna Maria Grazia Pia, Susanna Guatelli, INFNGuatelli, INFN Modelization of the Modelization of the

human body and human body and anatomy for anatomy for radioprotection studiesradioprotection studies

no hard-coded geometry, no hard-coded geometry, flexible configurationflexible configuration


GDML future developmentGDML future development auxiliary information associated to specific auxiliary information associated to specific

volumes sometimes neededvolumes sometimes needed sensitive detector namessensitive detector names visualisation attributesvisualisation attributes magnetic field, etcmagnetic field, etc

added optional (auxiliary) element to volume:added optional (auxiliary) element to volume:volume name="VeloSensors" >volume name="VeloSensors" >

<materialref ref="Silicon" /><materialref ref="Silicon" />

<solidref ref="detectorRUnion" /><solidref ref="detectorRUnion" />

<auxiliary auxtype="sensdet" auxvalue="veloSD"/><auxiliary auxtype="sensdet" auxvalue="veloSD"/>

</volume></volume>

Will be in next GDML release

New features inNew features inkernelkernelandand

detector responsesdetector responses

Material scannerMaterial scanner

ScorersScorers

Detector filtersDetector filters


Material scannerMaterial scanner Measures material thickness in units of geometrical length, radiation Measures material thickness in units of geometrical length, radiation

length and interaction length.length and interaction length.

It can be region sensitive, so that you can measure the thickness It can be region sensitive, so that you can measure the thickness

of one particular region.of one particular region.

/control/matScan/control/matScan

scan - Start material scanning.scan - Start material scanning.

theta - Define theta range.theta - Define theta range.

phi - Define phi range.phi - Define phi range.

singleMeasure - Measure thickness for one particular direction.singleMeasure - Measure thickness for one particular direction.

eyePosition - Define the eye position.eyePosition - Define the eye position.

regionSensitive - Set region sensitivity.regionSensitive - Set region sensitivity.

region - Define region name to be scanned.region - Define region name to be scanned.


Class diagramClass diagramG4LogicalVolume

G4VSensitiveDetector

G4MultiFunctionalDetectoruserSensitiveDetector

G4Event

G4HCofThisEvent

G4VHitsCollectionG4THitsCollection

G4THitsMap

userHitsCollectionor userHitsMap

G4VHit

userHit

G4VPrimitiveSensitivity

Concrete class provided by G4Abstract base class provided by G4Template class provided by G4

User’s class

G4PSDoseScorer hits map

has

kind of

G4PSDoseScorer hits mapG4PSDoseScorer hits map

G4PSDoseScorer hits mapG4PSDoseScorer hits map

0..1

n

1

n

n

n

n

1


G4MultiFunctionalDetectorG4MultiFunctionalDetector G4MultiFunctionalDetectorG4MultiFunctionalDetector is a concrete class derived from is a concrete class derived from

G4VSensitiveDetector. It should be set to a logical volume as a kind of G4VSensitiveDetector. It should be set to a logical volume as a kind of

sensitive detector.sensitive detector.

It takes arbitrary number of It takes arbitrary number of G4VPrimitiveSensitivityG4VPrimitiveSensitivity classes. By classes. By

registering G4VPrimitiveSensitivity classes, you can define the scoring registering G4VPrimitiveSensitivity classes, you can define the scoring

detector of your need.detector of your need.

Each G4VPrimitiveSensitivity class accumulates Each G4VPrimitiveSensitivity class accumulates one physics one physics

quantityquantity for each physical volume. for each physical volume.

For example, G4PSDoseScorer (a concrete class of For example, G4PSDoseScorer (a concrete class of

G4VPrimitiveSensitivity provided by Geant4) accumulates dose for G4VPrimitiveSensitivity provided by Geant4) accumulates dose for

each cell.each cell.

By using G4MultiFunctionalDetector and provided concrete By using G4MultiFunctionalDetector and provided concrete

G4VPrimitiveSensitivity classes, you are freed from implementing G4VPrimitiveSensitivity classes, you are freed from implementing

sensitive detector and hit classes.sensitive detector and hit classes.


Sensitive detector vs. primitive Sensitive detector vs. primitive scorerscorer

Sensitive detectorSensitive detector You have to implement your You have to implement your

own detector and hit classes.own detector and hit classes. One hit class can contain many One hit class can contain many

quantities. A hit can be made quantities. A hit can be made for each individual step, or for each individual step, or accumulate quantities.accumulate quantities.

Basically one hits collection is Basically one hits collection is made per one detector.made per one detector.

Hits collection is relatively Hits collection is relatively compact. compact.

Primitive scorerPrimitive scorer Many scorers are provided by Many scorers are provided by

Geant4. You can add your own.Geant4. You can add your own. Each scorer accumulates one Each scorer accumulates one

quantity for an event. quantity for an event.

G4MultiFunctionalDetector G4MultiFunctionalDetector creates many collections creates many collections (maps), i.e. one collection per (maps), i.e. one collection per one scorer.one scorer.

Keys of maps are redundant for Keys of maps are redundant for scorers of same volume.scorers of same volume.

I would suggest to :I would suggest to : Use primitive scorers Use primitive scorers

if you are if you are notnot interested in recording each individual step interested in recording each individual step butbut accumulating some physics quantities for an event or a run, andaccumulating some physics quantities for an event or a run, and

if you do if you do notnot have to have too many scorers. have to have too many scorers. Otherwise, consider implementing your own sensitive detector.Otherwise, consider implementing your own sensitive detector.


Hits collection, hits mapHits collection, hits map G4G4VVHitsCollection is the common abstract base class of both HitsCollection is the common abstract base class of both

G4THitsCollectionG4THitsCollection and and G4THitsMapG4THitsMap.. G4THitsCollectionG4THitsCollection is a is a template vector classtemplate vector class to store pointers of objects to store pointers of objects

of one concrete hit class type.of one concrete hit class type. A hit class (deliverable of G4VHit abstract base class) should have A hit class (deliverable of G4VHit abstract base class) should have

its own identifier (e.g. cell ID).its own identifier (e.g. cell ID). In other words, G4THitsCollection requires you to implement your hit In other words, G4THitsCollection requires you to implement your hit

class.class. G4THitsMapG4THitsMap is a is a template map classtemplate map class so that it stores keys (typically cell so that it stores keys (typically cell

ID, i.e. copy number of the volume) with pointers of objects of one type.ID, i.e. copy number of the volume) with pointers of objects of one type. Objects may not be those of hit class.Objects may not be those of hit class.

All of currently provided scorer classes use G4THitsMap with All of currently provided scorer classes use G4THitsMap with

simple double.simple double. Since G4THitsMap is a template, it can be used by your sensitive Since G4THitsMap is a template, it can be used by your sensitive

detector class to store hits. detector class to store hits.


List of provided primitive scorersList of provided primitive scorers Concrete Primitive Scorers ( See Application Developers Guide 4.4.6 )Concrete Primitive Scorers ( See Application Developers Guide 4.4.6 )

Track lengthTrack length G4PSTrackLength, G4PSPassageTrackLengthG4PSTrackLength, G4PSPassageTrackLength

Deposited energyDeposited energy G4PSEnergyDepsit, G4PSDoseDepositG4PSEnergyDepsit, G4PSDoseDeposit

Current/FluxCurrent/Flux G4PSFlatSurfaceCurrent, G4PSFlatSurfaceCurrent,

G4PSSphereSurfaceCurrent,G4PSPassageCurrent, G4PSFlatSurfaceFlux, G4PSSphereSurfaceCurrent,G4PSPassageCurrent, G4PSFlatSurfaceFlux, G4PSCellFlux, G4PSPassageCellFluxG4PSCellFlux, G4PSPassageCellFlux

OthersOthers G4PSMinKinEAtGeneration, G4PSNofSecondary, G4PSNofStepG4PSMinKinEAtGeneration, G4PSNofSecondary, G4PSNofStep

angle

V : Volume

L : Total step length in the cell.

SurfaceCurrent SurfaceCurrent ::

Count Count number of number of injecting injecting particles particles at defined at defined surface.surface.

SurfaceFlux :SurfaceFlux :Sum up Sum up 1/cos(angle) of 1/cos(angle) of injecting injecting particlesparticlesat defined at defined surfacesurface

CellFlux :CellFlux :Sum of L / V of Sum of L / V of injecting particles injecting particles in the geometrical in the geometrical cell.cell.


Keys of G4THitsMapKeys of G4THitsMap All provided primitive scorer classes use All provided primitive scorer classes use G4THitsMap<G4double>G4THitsMap<G4double>.. By default, the copy number is taken from the physical volume to which By default, the copy number is taken from the physical volume to which

G4MultiFunctionalDetector is assigned.G4MultiFunctionalDetector is assigned. If the physical volume is placed only once, but its (grand-)mother If the physical volume is placed only once, but its (grand-)mother

volume is replicated, use the second argument of the constructor of the volume is replicated, use the second argument of the constructor of the

primitive scorer to indicate the level where the copy number should be primitive scorer to indicate the level where the copy number should be

taken.taken.

e.g. G4PSCellFlux(G4Steing name, e.g. G4PSCellFlux(G4Steing name, G4int depth=0G4int depth=0))

See See

exampleN07exampleN07

If your indexing scheme is more complicated (e.g. utilizing copy If your indexing scheme is more complicated (e.g. utilizing copy

numbers of more than one hierarchies), you can override the virtual numbers of more than one hierarchies), you can override the virtual

method method GetIndex()GetIndex() provided for all the primitive scorers. provided for all the primitive scorers.

CopyNo0

Copy No0

CopyNo0

Copy No0

CopyNo0

Copy No0

Copy No 0 Copy No 1 Copy No 2

Scorer A

Scorer B

Key should be taken from upper geometry hierarchy


For example…For example…MyDetectorConstruction::Construct()

{ … G4LogicalVolume* myCellLog = new G4LogicalVolume(…);

G4VPhysicalVolume* myCellPhys = new G4PVParametrised(…);

G4MultiFunctionalDetector* myScorer = new G4MultiFunctionalDetector(“myCellScorer”);

G4SDManager::GetSDMpointer()->AddNewDetector(myScorer);

myCellLog->SetSensitiveDetector(myScorer);

G4VPrimitiveSensitivity* totalSurfFlux = new G4PSFlatSurfaceFlux(“TotalSurfFlux”);

myScorer->Register(totalSurfFlux);

G4VPrimitiveSensitivity* totalDose = new G4PSDoseDeposit(“TotalDose”);

myScorer->Register(totalDose);

} No need of implementing sensitive detector !


G4VSDFilterG4VSDFilter G4VSDFilter can be attached to G4VSensitiveDetector and/or

G4VPrimitiveSensitivity to define which kinds of tracks are to be scored.

E.g., surface flux of protons can be scored by G4PSFlatSurfaceFlux

with a filter that accepts protons only.

G4VSensitiveDetector

G4MultiFunctionalDetectoruserSensitiveDetector

G4VPrimitiveSensitivity

G4PSDoseScorerG4PSDoseScorer

G4PSDoseScorerG4PSDoseScorer

G4PSDoseScorer

G4VSDFilter

G4SDParticleFilterG4SDParticleFilter

userFilter




List of provided filter classesList of provided filter classes G4SDChargedFilter, G4SDNeutralFilterG4SDChargedFilter, G4SDNeutralFilter

Accept only charged/neutral tracks, respectivelyAccept only charged/neutral tracks, respectively G4SDKineticEnergyFilterG4SDKineticEnergyFilter

Accepts tracks within the defined range of kinetic energyAccepts tracks within the defined range of kinetic energy G4SDParticleFilterG4SDParticleFilter

Accepts tracks of registered particle typesAccepts tracks of registered particle types G4SDParticleWithEnergyFilterG4SDParticleWithEnergyFilter

Accepts tracks of registered particle types within the defined range Accepts tracks of registered particle types within the defined range of kinetic energyof kinetic energy

G4VSDFilterG4VSDFilter Abstract base class which you can use to make your own filterAbstract base class which you can use to make your own filterclass G4VSDFilter { public: G4VSDFilter(G4String name); virtual ~G4VSDFilter(); public: virtual G4bool Accept(const G4Step*) const = 0;…


For example…For example…MyDetectorConstruction::Construct()

{ … G4LogicalVolume* myCellLog = new G4LogicalVolume(…);

G4VPhysicalVolume* myCellPhys = new G4PVParametrised(…);

G4MultiFunctionalDetector* myScorer = new G4MultiFunctionalDetector(“myCellScorer”);

G4SDManager::GetSDMpointer()->AddNewDetector(myScorer);

myCellLog->SetSensitiveDetector(myScorer);

G4VPrimitiveSensitivity* totalSurfFlux = new G4PSFlatSurfaceFlux(“TotalSurfFlux”);

myScorer->Register(totalSurfFlux);

G4VPrimitiveSensitivity* protonSufFlux = new G4PSFlatSurfaceFlux(“ProtonSurfFlux”);

G4VSDFilter* protonFilter = new G4SDParticleFilter(“protonFilter”);

protonFilter->Add(“proton”);

protonSurfFlux->SetFilter(protonFilter);

myScorer->Register(protonSurfFlux);

}

New Geant4 licenseNew Geant4 license

The New Geant4 License

•Makes clear the user’s Makes clear the user’s wide-ranging freedom to wide-ranging freedom to use, extend or redistribute use, extend or redistribute Geant4, even as part of Geant4, even as part of some for-profit venture.some for-profit venture.

•The license was released The license was released along with the latest along with the latest Geant4 release 8.1.Geant4 release 8.1.

•Simple enough that you Simple enough that you can read and understand can read and understand it.it.

In response to user requests for clarification of Geant4’s In response to user requests for clarification of Geant4’s distribution policy, the collaboration recently announced a new distribution policy, the collaboration recently announced a new license.license.

•http://geant4.web.cern.cn/geant4/license/http://geant4.web.cern.cn/geant4/license/

http://geant4.slac.stanford.edu/g4namu/


Installation, use, reproduction, display, modification and redistribution of this software, with or without modification, in source and binary forms, are permitted on a non- exclusive basis. Any exercise of rights by you under this license is subject to the following conditions: 1. Redistributions of this software, in whole or in part, with or without modification, must reproduce the above copyright notice and these license conditions in this software, the user documentation and any other materials provided with the redistributed software. 2. The user documentation, if any, included with a redistribution, must include the following notice:"This product includes software developed by Members of the Geant4 Collaboration ( http://cern.ch/geant4 )." If that is where third-party acknowledgments normally appear, this acknowledgment must be reproduced in the modified version of this software itself. 3. The names "Geant4” and “The Geant4 toolkit” may not be used to endorse or promote software, or products derived therefrom, except with prior written permission by [email protected]. If this software is redistributed in modified form, the name and reference of the modified version must be clearly distinguishable from that of this software.

License has 8 points. The points are written clearly and simply.License has 8 points. The points are written clearly and simply.

1,2 and 3) Tell the world who the software came from, and don’t claim 1,2 and 3) Tell the world who the software came from, and don’t claim you are us.you are us.


4. You are under no obligation to provide anyone with any modifications of this software that you may develop, including but not limited to bug fixes, patches, upgrades or other enhancements or derivatives of the features, functionality or performance of this software. However, if you publish or distribute your modifications without contemporaneously requiring users to enter into a separate written license agreement, then you are deemed to have granted all Members and all Copyright Holders of the Geant4 Collaboration a license to your modifications, including modifications protected by any patent owned by you, under the conditions of this license. 5. You may not include this software in whole or in part in any patent or patent application in respect of any modification of this software developed by you.

4) If you choose to give it away free to everyone, we can have it for 4) If you choose to give it away free to everyone, we can have it for free too.free too.

5) You can’t patent the parts we did.5) You can’t patent the parts we did.


6. DISCLAIMERTHIS SOFTWARE IS PROVIDED BY THE MEMBERS AND COPYRIGHT HOLDERS OF THE GEANT4 COLLABORATION AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY, OF SATISFACTORY QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE OR USE ARE DISCLAIMED. THE MEMBERS OF THE GEANT4 COLLABORATION AND CONTRIBUTORS MAKE NO REPRESENTATION THAT THE SOFTWARE AND MODIFICATIONS THEREOF, WILL NOT INFRINGE ANY PATENT, COPYRIGHT, TRADE SECRET OR OTHER PROPRIETARY RIGHT. 7. LIMITATION OF LIABILITYTHE MEMBERS AND COPYRIGHT HOLDERS OF THE GEANT4 COLLABORATION AND CONTRIBUTORS SHALL HAVE NO LIABILITY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF USE, DATA OR PROFITS, OR BUSINESS INTERRUPTION, HOWEVER CAUSED AND ON ANY THEORY OF CONTRACT, WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 8. This license shall terminate with immediate effect and without notice if you fail to comply with any of the terms of this license, or if you institute litigation against any Member or Copyright Holder of the Geant4 Collaboration with regard to this software.

We don’t claim that it works, and we’re not responsible if it doesn’t.We don’t claim that it works, and we’re not responsible if it doesn’t.


•Through the generous Through the generous support of many support of many governments and governments and institutions, you, the institutions, you, the community, have already community, have already paid for Geant4.paid for Geant4.

•We, the Geant4 We, the Geant4 collaboration, want you to collaboration, want you to enjoy the software and enjoy the software and use it where ever you can.use it where ever you can.

That’s it.That’s it.

•http://geant4.web.cern.cn/geant4/license/http://geant4.web.cern.cn/geant4/license/

http://geant4.slac.stanford.edu/g4namu/

Planned new featuresPlanned new featuresin December releasein December release

Parallel navigationParallel navigation


Parallel navigationParallel navigation Occasionally, it is not straightforward to define sensitivity, importance or Occasionally, it is not straightforward to define sensitivity, importance or

envelope to be assigned to volumes in the mass geometry.envelope to be assigned to volumes in the mass geometry. Typically a geometry built machinery by CAD, GDML, DICOM, etc. has Typically a geometry built machinery by CAD, GDML, DICOM, etc. has

this difficulty.this difficulty. New parallel navigation functionality allows the user to define more than New parallel navigation functionality allows the user to define more than

one worlds simultaneously.one worlds simultaneously. New G4CoupledTransportation process sees all worlds simultaneously.New G4CoupledTransportation process sees all worlds simultaneously.

G4CoupledTransportation will be renamed to G4Transportation G4CoupledTransportation will be renamed to G4Transportation

later.later. A step is limited not only by the boundary of the mass geometry but A step is limited not only by the boundary of the mass geometry but

also by the boundaries of parallel geometries. also by the boundaries of parallel geometries. Materials, production thresholds and EM field are used only from the Materials, production thresholds and EM field are used only from the

mass geometry.mass geometry. In a parallel world, the user can define volumes in arbitrary manner In a parallel world, the user can define volumes in arbitrary manner

with sensitivity, regions with shower parameterization, and/or with sensitivity, regions with shower parameterization, and/or

importance field for biasing. importance field for biasing. Volumes in different worlds may overlap.Volumes in different worlds may overlap.

comingsoon


Parallel navigationParallel navigation In the current version, we have already had several ways of utilizing a In the current version, we have already had several ways of utilizing a

concept of parallel world. But the usages are quite different to each concept of parallel world. But the usages are quite different to each

other.other.

Ghost volume for shower parameterization assigned to Ghost volume for shower parameterization assigned to

G4GlobalFastSimulationManagerG4GlobalFastSimulationManager

Readout geometry assigned to G4VSensitiveDetectorReadout geometry assigned to G4VSensitiveDetector

Importance field geometry for geometry importance biasing Importance field geometry for geometry importance biasing

assigned to importance biasing processassigned to importance biasing process

Scoring geometry assigned to scoring processScoring geometry assigned to scoring process

We will merge all of them into common parallel world scheme.We will merge all of them into common parallel world scheme.

Readout geometry for sensitive detector will be kept for backward Readout geometry for sensitive detector will be kept for backward

compatibility.compatibility.

Other current “parallel world schemes” will become obsolete. Other current “parallel world schemes” will become obsolete.

comingsoon


Parallel navigationParallel navigation G4VUserParrallelWorld is the new base class where the user G4VUserParrallelWorld is the new base class where the user

implements a parallel world.implements a parallel world.

The world physical volume of the parallel world is provided by The world physical volume of the parallel world is provided by

G4RunManager as a clone of the mass geometry.G4RunManager as a clone of the mass geometry.

All UserParallelWorlds must be registered to All UserParallelWorlds must be registered to

UserDetectorConstruction.UserDetectorConstruction.

Each parallel world has its dedicated G4Navigator object, that is Each parallel world has its dedicated G4Navigator object, that is

automatically assigned when it is constructed.automatically assigned when it is constructed.

Though all worlds will be comprehensively taken care by Though all worlds will be comprehensively taken care by

G4(Coupled)Transportation process for their navigations, each parallel G4(Coupled)Transportation process for their navigations, each parallel

world must have its own process to achieve its purpose.world must have its own process to achieve its purpose.

For example, in case the user defines a sensitive detector to a For example, in case the user defines a sensitive detector to a

parallel world, a process dedicated to this world is responsible to parallel world, a process dedicated to this world is responsible to

invoke this detector. G4SteppingManager sees only the detectors invoke this detector. G4SteppingManager sees only the detectors

in the mass geometry. We will provide such process classes and in the mass geometry. We will provide such process classes and

some examples.some examples.

comingsoon

recent and on-going developments in kernel makoto asai (slac) 4 th geant4 space users’ workshop...

Documents

release recent

ongoing developments

geometry new features

geant4 version

constituent volumes

reflected volumes

check overlaps

patch01 release