stab at using the beam to get elastic events at the MD. this proceduc…

…es 1e7 events in about 4.5ks and results in about 500 events at the MD
JeffersonLab · Feb 24, 2024 · da999a7 · da999a7
1 parent 25da657
commit da999a7
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Showing 7 changed files with 163 additions and 12 deletions.
diff --git a/geometry/mollerParallel.gdml b/geometry/mollerParallel.gdml
@@ -186,6 +186,26 @@
     <auxiliary auxtype="DetNo" auxvalue="5556"/>
   </volume>
 
+  <volume name="tgtEntVirtualPlane_log">
+    <materialref ref="G4_Galactic"/>
+    <solidref ref="smallVirtualPlane_solid"/>
+    <auxiliary auxtype="Visibility" auxvalue="true"/>
+    <auxiliary auxtype="Color" auxvalue="yellow"/>
+    <auxiliary auxtype="Alpha" auxvalue="1"/>
+    <auxiliary auxtype="SensDet" auxvalue="planeDet"/>
+    <auxiliary auxtype="DetNo" auxvalue="5687"/>
+  </volume>
+
+  <volume name="tgtExitVirtualPlane_log">
+    <materialref ref="G4_Galactic"/>
+    <solidref ref="smallVirtualPlane_solid"/>
+    <auxiliary auxtype="Visibility" auxvalue="true"/>
+    <auxiliary auxtype="Color" auxvalue="yellow"/>
+    <auxiliary auxtype="Alpha" auxvalue="1"/>
+    <auxiliary auxtype="SensDet" auxvalue="planeDet"/>
+    <auxiliary auxtype="DetNo" auxvalue="5688"/>
+  </volume>
+
   <volume name="collar0EntVirtualPlane_log">
     <materialref ref="G4_Galactic"/>
     <solidref ref="smallVirtualPlane_solid"/>
@@ -986,6 +1006,16 @@
       <position name="collar0USVirtualPlane_pos" unit="mm" z="-1210"/>
     </physvol>
 
+    <physvol    name="tgtEntVirtualPlane_phys">
+      <volumeref ref="tgtEntVirtualPlane_log"/>
+      <position name="tgtEntVirtualPlane_pos" unit="mm" z="-5300"/>
+    </physvol>
+
+    <physvol    name="tgtExitVirtualPlane_phys">
+      <volumeref ref="tgtExitVirtualPlane_log"/>
+      <position name="tgtExitVirtualPlane_pos" unit="mm" z="-3790"/>
+    </physvol>
+
     <physvol    name="collar0DSVirtualPlane_phys">
       <volumeref ref="collar0ExitVirtualPlane_log"/>
       <position name="collar0DSVirtualPlane_pos" unit="mm" z="-990"/>

diff --git a/geometry/target/subTargetRegion.gdml b/geometry/target/subTargetRegion.gdml
@@ -224,6 +224,17 @@
       <zplane rmin="0" rmax="68" z="-3190.0"/>
       <zplane rmin="0" rmax="68" z="-1000.0"/>
     </polycone>
+
+
+    <tube name="refuseLowR_solid" rmin="0.0" rmax="3.85" z="1" 
+	  deltaphi="360" startphi="0" aunit="deg" lunit="mm"/>
+
+    <tube name="refuseHighR_solid" rmin="14.35" rmax="200" z="1" 
+	  deltaphi="360" startphi="0" aunit="deg" lunit="mm"/>
+
+    <tube name="acceptance_solid" rmin="0" rmax="200" z="1" 
+	  deltaphi="360" startphi="0" aunit="deg" lunit="mm"/>
+
   </solids>
 
   <structure>
@@ -334,16 +345,22 @@
 
        <!-- target chamber-->
    <volume name="target_chamber_vol1">
-    <materialref ref="G4_Al"/>
+    <!-- <materialref ref="G4_Al"/> -->
+    <materialref ref="Kryptonite"/>
     <solidref ref="Tube_target_chamber_1"/>
+    <auxiliary auxtype="Color" auxvalue="red"/>           	  
    </volume> 
    <volume name="target_chamber_vol2">
-    <materialref ref="G4_Al"/>
+    <!-- <materialref ref="G4_Al"/> -->
+    <materialref ref="Kryptonite"/>
     <solidref ref="Tube_target_chamber_2"/>
+    <auxiliary auxtype="Color" auxvalue="red"/>           	  
    </volume>    
    <volume name="target_chamber_vol3">
-    <materialref ref="G4_Al"/>
+    <!-- <materialref ref="G4_Al"/> -->
+    <materialref ref="Kryptonite"/>
     <solidref ref="target_entry_window_subtraction"/>
+    <auxiliary auxtype="Color" auxvalue="red"/>           	  
    </volume>   	  
    <volume name="target_chamber_vol5">
     <materialref ref="G4_Al"/>
@@ -375,14 +392,33 @@
     <materialref ref="G4_Al"/>
     <solidref ref="Target_exit_window_Tube_5"/>
     <auxiliary auxtype="Color" auxvalue="cyan"/>           	  
-  </volume> 
+  </volume> 	
   <volume name="TubeVol6">
     <materialref ref="G4_Al"/>
     <solidref ref="Target_exit_window_Tube_6"/>
     <auxiliary auxtype="Color" auxvalue="cyan"/>           
   </volume> 	  
-
-
+
+  <volume name="acceptance_logic">
+    <materialref ref="G4_Galactic"/>
+    <solidref ref="acceptance_solid"/>
+    <auxiliary auxtype="Color" auxvalue="green"/>           
+  </volume> 	  
+
+  <volume name="refuseLowR_logic">
+    <materialref ref="Kryptonite"/>
+    <solidref ref="refuseLowR_solid"/>
+    <auxiliary auxtype="Color" auxvalue="red"/>           
+  </volume> 	  
+
+  <volume name="refuseHighR_logic">
+    <materialref ref="Kryptonite"/>
+    <solidref ref="refuseHighR_solid"/>
+    <auxiliary auxtype="Color" auxvalue="red"/>           
+  </volume> 	  
+
+
+
        <!-- pipe from target exit window to bellow1 -->  
   <volume name="connecting_pipe_volume_1">
     <materialref ref="G4_Al"/>
@@ -522,6 +558,21 @@
       <volumeref ref="flange_vol_1"/>
       <position name="flange_pos_1" unit="mm" x="0.0" y="0.0" z="877.01+0.635+6.35+12.7+1.524+134.42+28.45"/>
     </physvol>	  
+
+    <physvol    name="acceptance">
+      <volumeref ref="acceptance_logic"/>
+      <position name="acceptance_pos" unit="mm" z="660"/>
+    </physvol>	  
+
+    <physvol name="refuseLowR">
+      <volumeref ref="refuseLowR_logic"/>
+      <position name="refuseLowR_pos" unit="mm" z="700"/>
+    </physvol>	  
+
+    <physvol name="refuseHighR">
+      <volumeref ref="refuseHighR_logic"/>
+      <position name="refuseHighR_pos" unit="mm" z="700"/>
+    </physvol>	  
 
     </volume>
 

diff --git a/geometry/target/targetLadder.gdml b/geometry/target/targetLadder.gdml
@@ -40,6 +40,10 @@
 
   <box name="TargetCFoil_solid" x="25*mm" y="25*mm" z="1*mm"/>
 
+  <tube name="Target_HighZTarget_solid"
+        aunit="deg" lunit="mm" deltaphi="360"
+        rmax="20" rmin="0" z="0.3175"/>
+
 </solids>
 
 <structure>
@@ -124,9 +128,10 @@
     <auxiliary auxtype="TargetSamplingVolume" auxvalue="USAl"/>
   </volume>
   <volume name="TargetAlDummy2pctDS_logical">
-    <materialref ref="G4_Al"/>
-    <solidref ref="TargetAlDummy2pct_solid"/>
-    <auxiliary auxtype="TargetSamplingVolume" auxvalue="DSAl"/>
+    <materialref ref="G4_Ta"/>
+    <solidref ref="Target_HighZTarget_solid"/>
+    <auxiliary auxtype="TargetSamplingVolume" auxvalue="HighZ"/>
+    <auxiliary auxtype="Color" auxvalue="yellow"/>
   </volume>
   <volume name="TargetAlDummy2pctUS_logical">
     <materialref ref="G4_Al"/>
@@ -165,7 +170,7 @@
     <solidref ref="TargetPosition_solid"/>
     <physvol>
       <volumeref ref="TargetAlDummy2pctDS_logical"/>
-      <position z="+125/2*cm"/>
+      <position z="0"/>
     </physvol>
     <auxiliary auxtype="TargetSystem" auxvalue="AlDummy2DS"/>
   </volume>

diff --git a/macros/runexample_heavyZ.mac b/macros/runexample_heavyZ.mac
@@ -0,0 +1,52 @@
+#  Example file
+
+# This must be called before initialize
+/remoll/geometry/setfile geometry/mollerMother.gdml
+/remoll/parallel/setfile geometry/mollerParallel.gdml 
+
+# This must be explicitly called
+/run/initialize
+
+# Set target ladder position
+/remoll/geometry/absolute_position targetLadder (0,490,0)
+/remoll/target/mother AlDummy2DS
+/remoll/target/volume HighZ
+
+# Load magnetic fields
+/control/execute macros/load_magnetic_fieldmaps.mac
+
+# Raster and initial angle stuff
+/remoll/oldras true
+/remoll/rasx 0.1 mm
+/remoll/rasy 0.1 mm
+/remoll/evgen/set beam
+/remoll/beamcurr 65 microampere
+/remoll/beamene 11 GeV
+
+/remoll/kryptonite/enable
+/remoll/kryptonite/add Kryptonite
+/remoll/kryptonite/list
+
+/remoll/SD/disable_all
+
+/remoll/SD/enable 28
+/remoll/SD/detect secondaries 28
+/remoll/SD/detect boundaryhits 28
+
+##coll2 exit
+/remoll/SD/enable 39
+/remoll/SD/detect boundaryhits 39
+
+###coll4 exit
+# /remoll/SD/enable 45
+# /remoll/SD/detect boundaryhits 45
+
+/remoll/tracking/set 0
+
+/remoll/seed 123456
+
+/remoll/filename o_Ta_1e7.root
+
+/remoll/target/print
+/run/beamOn 10000000
+
diff --git a/src/remollBeamTarget.cc b/src/remollBeamTarget.cc
@@ -427,7 +427,7 @@ remollVertex remollBeamTarget::SampleVertex(SamplingType_t sampling_type)
       // Gaussian distribution with mean and sigma
       bmth = G4RandGauss::shoot(fTh0, fdTh);
       bmph = G4RandGauss::shoot(fPh0, fdPh);
-
+      
       if( fRasterX > 0 ){ bmth += fCorrTh*(rasx-fX0)/fRasterX/2; }
       if( fRasterY > 0 ){ bmph += fCorrPh*(rasy-fY0)/fRasterY/2; }
 

diff --git a/src/remollGenBeam.cc b/src/remollGenBeam.cc
@@ -32,7 +32,7 @@ remollGenBeam::remollGenBeam()
   fIsotropicThetaMax(2.0*pi),
   fCorrelation(0.0653*mrad/mm,0.0653*mrad/mm,0.0),
   fPolarization(0.0,0.0,0.0),
-  fRaster(5*mm,5*mm,0.0),
+  fRaster(0.1*mm,0.1*mm,0.0),
   fRasterRefZ(-4.5*m),
   fParticleName("e-")
 {

diff --git a/src/remollSteppingAction.cc b/src/remollSteppingAction.cc
@@ -15,4 +15,17 @@ remollSteppingAction::~remollSteppingAction()
 
 void remollSteppingAction::UserSteppingAction(const G4Step *aStep)
 {
+  G4StepPoint*          thePrePoint  = aStep->GetPreStepPoint();
+  G4VPhysicalVolume*    thePrePV     = thePrePoint->GetPhysicalVolume();
+  G4StepPoint*          thePostPoint = aStep->GetPostStepPoint();
+  G4VPhysicalVolume*    thePostPV    = thePostPoint->GetPhysicalVolume();
+
+  if(!thePostPV || !thePrePV)	return;
+
+  //G4cout<<">>> "<<pv->GetName()<<G4endl;
+  //std::cin.ignore();
+  if (((thePrePV->GetName()).contains("acceptance") || (thePostPV->GetName()).contains("acceptance")))
+    if (aStep->GetTrack()->GetKineticEnergy() < 2*CLHEP::GeV) 
+      aStep->GetTrack()->SetTrackStatus(fStopAndKill);
+
 }