System : Ubuntu 18.04
REST version : v2.2.18
REST commit : 6cfe483f
Hi,
I am generating 2.2 MeV electrons inside the basic setup volume that was defined for the 01.NLDBD-PandaX-III example which should correspond to the 200kg Xe+1%TMA mixture.
The problem is that there are not a lot of energy depositions inside the gas volume, as I would expect.
Also, I do not understand why I have such big tracks for gammas, which should have similar tracks to the electrons for this setup if I am not mistaken.
Changing maxTargetStepSize and subEventTimeDelay in my restG4 .rml configuration file has no effect on frequency of energy depositions.
A storage section was defined like this:
<storage sensitiveVolume=“gas”>
<parameter name=“energyRange” value=“(0,5)” units=“MeV” />
<activeVolume name=“gas” chance=“1” />
</storage>
Therefore, I do not understand the energy deposition problem.
This is my .rml file which I use for electron generation:
<restG4>
<globals>
<parameter name=“mainDataPath” value=“” />
<parameter name=“verboseLevel” value=“essential” />
<variable name=“NEVENTS” value=“20” overwrite=“false”/>
<variable name=“MAXTARGETSTEPSIZE” value=“10” overwrite=“false”/>
<variable name=“SUBEVENTTIMEDELAY” value=“10” overwrite=“false”/>
</globals>
<TRestRun name=“Gamma run” title=“REST Metadata run of Gamma 2.2MeV”>
<parameter name=“experiment” value=“particle_gen”/>
<parameter name=“runType” value=“simulation”/>
// Value “auto” can add simulation run into database ???
<parameter name=“runNumber” value=“auto”/>
// The runTag in a restG4 simulation will be replaced by the title of TRestG4Metadata
<parameter name=“runTag” value=“g4Tag”/>
// The output filename can be built using any member from TRestRun, fRunNumber, fRunTag, …, etc.
<parameter name=“outputFile” value=“Run[fRunNumber][fRunTag][fExperimentName].root” />
<parameter name=“runDescription” value=“We launch just 20 events to check everything is ok.”/>
<parameter name=“user” value=“${USER}”/>
<parameter name=“verboseLevel” value=“3”/>
<parameter name=“overwrite” value=“on” />
<parameter name=“readOnly” value=“false” />
</TRestRun>
<!–Electron events generation part (In case you want to generate .root file with electron events: restG4 “filename”.rml ElectronGen) →
<TRestG4Metadata name=“ElectronGen” title=“electron2_2MeV”>
<parameter name=“verboseLevel” value=“extreme”/>
<parameter name=“gdml_file” value=“geometry/mySetupTemplate.gdml”/>
<parameter name=“maxTargetStepSize” value=“${MAXTARGETSTEPSIZE}” units=“um” />
<parameter name=“subEventTimeDelay” value=“${SUBEVENTTIMEDELAY}” units=“us” />
<parameter name=“Nevents” value=“${NEVENTS}” />
///three types of source definition supported:
<!– →
<generator type=“point” position=“(0,0,150)” units=“mm”>
<source use=“geant4” particle=“e-”>
<angularDist type=“isotropic” />
<energyDist type=“flat” range=“(2100,2300)” units=“keV” />
</source>
</generator>
<biasing value=“off” type=“virtualBox”>
<biasingVolume size=“2850mm” position=“(0,0,0)mm” factor=“2” energyRange=“(0,5)MeV” />
<biasingVolume size=“2450mm” position=“(0,0,0)mm” factor=“2” energyRange=“(0,5)MeV” />
<biasingVolume size=“2050mm” position=“(0,0,0)mm” factor=“2” energyRange=“(0,5)MeV” />
</biasing>
<storage sensitiveVolume=“gas”>
<parameter name=“energyRange” value=“(0,5)” units=“MeV” />
<activeVolume name=“gas” chance=“1” />
</storage>
</TRestG4Metadata>
<TRestPhysicsLists name=“default” title=“First physics list implementation.” >
<parameter name=“cutForGamma” value=“1” units=“um” />
<parameter name=“cutForElectron” value=“1” units=“um” />
<parameter name=“cutForPositron” value=“1” units=“mm” />
<parameter name=“cutForMuon” value=“1” units=“mm” />
<parameter name=“cutForNeutron” value=“1” units=“mm” />
<parameter name=“minEnergyRangeProductionCuts” value=“10” units=“eV” />
<parameter name=“maxEnergyRangeProductionCuts” value=“1” units=“GeV” />
<!-- EM Physics lists →
<physicsList name=“G4EmLivermorePhysics”>
<!-- Hadron physics lists →
<physicsList name=“G4HadronElasticPhysicsHP”>
<physicsList name=“G4IonBinaryCascadePhysics”>
<physicsList name=“G4HadronPhysicsQGSP_BIC_HP”>
<physicsList name=“G4NeutronTrackingCut”>
<physicsList name=“G4EmExtraPhysics”>
</TRestPhysicsLists>
</restG4>
Am I defining a sensitive volume incorrectly? I am missing something and I do not understand what exactly. Thanks in advance for the help!
P.S.:
In the myGeometryTemplate.gdml the gas volume is defined like this:
<structure>
<!-- {{{ Volumes definition (material and solid assignment) →
<volume name=“gasVolume”>
<materialref ref=“Xenon_TMA”/>
<solidref ref=“gasSolid”/>
</volume>
…
…
</structure>
In the materials.xml:
<material name=“Xenon_TMA” state=“gas”>
<D unit=“mg/cm3” value=“targetGasDensity+quencherDensity” />
<P unit=“bar” value=“gasPressure” />
<T unit=“K” value=“gasTemperature” />
<fraction n=“quencherFraction” ref=“TMA” />
<fraction n=“1-quencherFraction” ref=“Xenon” />
</material>
And finally, in mySetupTemplate.gdml these variables were defined as follows:
<define>
<variable name=“targetGasDensity” value=“56.5884”/>
<variable name=“quencherDensity” value=“0.254”/>
<variable name=“quencherFraction” value=“0.01”/>
<variable name=“gasTemperature” value=“300”/>
<variable name=“gasPressure” value=“10”/>
</define>
Thus, everything should correspond to a proper Xe+1%TMA gas mixture during the Monte-Carlo simulation of the electrons inside the gas tank.
I have attached these files in addition to the materials.xml here, just in case.
materials.xml (9.9 KB) myGeometryTemplate.gdml (2.1 KB) mySetupTemplate.gdml (1.6 KB)
