Run in GEMC
Since the LUND file is limited to 75000 particles (225000 lines), the gemc will have to be run in batch mode;
11GeV incident electron
Simulating with GEMC
For an incident electron at 11GeV, the Moller electron in the range of 5 to 40 degrees for the scattering angle Theta, has energies lower than 200MeV.
![Mol E Theta Lab Spread.png](/./images/d/d3/Mol_E_Theta_Lab_Spread.png)
~/src/CLAS/GEMC/experiments/eg12/MolrBckGrd/DV/Isotropic_study/LH2_0Sol_0Tor_11GeV_IsotropicPhi_ShieldOut> wc -l LUND_Spread_LH2_IsotropicPhi.LUND 315000 LUND_Spread_LH2_IsotropicPhi.LUND
Spliting the LUND file into 105 parts of 1000 events, or 3000 lines
split -d -l 3000 -a 3 LUND_Spread_LH2_IsotropicPhi.LUND LH2_0Sol_0Tor_11GeV_IsotropicPhi_ShieldOut_
Naming these files LUND files
prename 's/(LH2_0Sol_0Tor_11GeV_IsotropicPhi_ShieldOut_\d{3})/$1.LUND/' LH2_0Sol_0Tor_11GeV_IsotropicPhi_ShieldOut_*
Placing each of these files into its own directory, within a directory named LH2_0Sol_0Tor_11GeV_IsotropicPhi_ShieldOut
find . -name "*.LUND" -exec sh -c 'mkdir "${1%.*}" ; mv "$1" "${1%.*}" ' _ {} \;
Defining the gcards
<gcard> <!-- minumal detectors for HB tracking --> <detector name="../../../../../../clas12/fc/forwardCarriage" factory="TEXT" variation="original"/> <detector name="../../../../../../clas12/dc/dc" factory="TEXT" variation="ccdb"/> <detector name="../../../../../../clas12/ftof/ftof" factory="TEXT" variation="java"/> <!--option name="SCALE_FIELD" value="clas12-torus-big, -1"/--> <option name="OUTPUT" value="evio, LH2_0Sol_0Tor_11GeV_IsotropicPhi_ShieldOut_000.evio"/> <option name="ALLRAWS" value="dc"/> <!--option name="INTEGRATEDDGT" value="DC"/--> <option name="INTEGRATEDRAW" value="dc"/> <option name="PHYSICS" value="FTFP_BERT + STD + Optical"/> <!--option name="PHYSICS" value="STD"/--> <option name="BANK_VERBOSITY" value="1"/> <option name="HIT_VERBOSITY" value="1"/> <option name="LOG_VERBOSITY" value="1"/> <option name="G4TRACK_VERBOSITY" value="1"/> <option name="G4P_VERBOSITY" value="1"/> <option name="GEN_VERBOSITY" value="1"/> <option name="SAVE_ALL_MOTHERS" value="2"/> <!-- Solenoid apparatus and field --> <!--detector name="../../../../../../clas12/magnets/solenoid" factory="TEXT" variation="original"/--> <!--option name="HALL_FIELD" value="clas12-solenoid"/--> <!-- other CLAS detectors --> <detector name="../../../../../../clas12/ec/ec" factory="TEXT" variation="original"/> <detector name="../../../../../../clas12/ctof/ctof" factory="TEXT" variation="original"/> <detector name="../../../../../../clas12/htcc/htcc" factory="TEXT" variation="original"/> <detector name="../../../../../../clas12/pcal/pcal" factory="TEXT" variation="javageom"/> <!--detector name="../../../../../../clas12/micromegas/micromegas" factory="TEXT" variation="original"/--> <!-- Beamline material --> <!--detector name="../../../../../../clas12/beamline/beamline" factory="TEXT" variation="ft"/--> </gcard>
Using a file to store the needed commands
/src/CLAS/GEMC/source/gemc -USE_GUI=0 -INPUT_GEN_FILE="LUND,MolTest.LUND" -N=100 eg12.gcard Solenoid off ~/src/CLAS/coatjava-2.4/bin/clas12-reconstruction -i ../files/MolrBckGrd/Molr.evio -config GEOM::new=true -config MAG::torus=1.0 -config MAG::solenoid=0.0 -o ../files/MolrBckGrd/Molr_rec.evio -s DCHB:DCTB:EC:FTOF:EB -config DATA::mc=true Solenoid ON ~/src/CLAS/coatjava-2.4/bin/clas12-reconstruction -i ../files/MolrBckGrd/Molr.evio -config GEOM::new=true -config MAG::torus=-1.0 -config MAG::solenoid=1.0 -o ../files/MolrBckGrd/Molr_rec.evio -s DCHB:DCTB:EC:FTOF:EB -config DATA::mc=true -config DCTB::useRaster=true ~/src/CLAS/coatjava-2.4/bin/evio-dump -i ../files/MolrBckGrd/Molr_rec.0.evio
Analyzing Results
Using cat to combine the reconstructed particles found using Analysis.groovy, we can output the particle number from the LUND file, Total Energy, scattering angles Theta, and Phi for the generated and reconstructed particles respectively.
For 0T:
571-1 0.12103204139108564 5.232292493596922 9.99999999997547 0.2397734 64.37257 163.2439 23025-3 0.02376743729734356 11.825408412314742 9.999999999978474 0.29301766 89.180336 -164.40204
For 5T:
24726-1 0.08576327895104396 6.223977074710134 9.99999999997547 0.17311224 20.298353 39.036583 19970-3 0.026540097007028158 11.193535798440614 9.999999999969427 0.15106007 49.16122 14.2969885
Converting the particle number per run into the particle number via the LUND file:
Multiplying the line number by 3 accounts for the 3 lines per particle in the LUND file. From this LUND particle we find the weight associated with each particle (Specific Energy and angle Theta).
To find the number of particles we can use an awk command:
awk 'NR == 1711 { print $6 }' LUND_Spread.LUND
Particle number | Run number | LUND Moller electron number | Overall LUND particle number | Corrected LUND header line number | Number of Particles |
---|---|---|---|---|---|
571 | 1 | 571 | 1713 | 1711 | 1097.227223687062 |
23025 | 3 | 69075 | 207225 | 207223 | 25951.273801947842 |
24726 | 1 | 24726 | 74178 | 74176 | 2579.181846387747 |
19970 | 3 | 59910 | 179730 | 179728 | 14255.222465310777 |
Cross Section
Using the number of expected Moller electrons and the fact that the reaction cross section can be found using the Luminosity we find: Integrating the differential cross-section over the solid angle:
![DetectorIntegrationXSect LH2 11GeV.png](/./images/e/e6/DetectorIntegrationXSect_LH2_11GeV.png)
IntegralDiffXSect->Integral()
4.97493824519086629e+04 barns
Multiplying by the Luminosity, we find:
Since this is just a ratio of detected particles to total particles, this gives the cross section as a relative probablity of a scattering, or reaction, to occur.
For 0T with 11GeV incident electrons:
For 5T with 11GeV incident electrons:
5.5GeV incident electron
![Mol E Theta Lab Spread half.png](/./images/3/30/Mol_E_Theta_Lab_Spread_half.png)
For 0T:
16544-1 0.10778422619732184 5.519947956962607 9.999999999974188 0.19995739 25.982777 96.17941
For 5T:
354-1 0.09640233076149667 5.8423283009263045 9.999999999976643 0.09051078 49.163692 -85.56053 5526-4 0.03948624565299794 9.164813676343726 9.999999999971514 0.12387912 52.14526 50.051956 21892-4 0.02741437437384611 11.000629446532491 9.99999999997668 0.26457193 81.77688 179.14293
Particle number | Run number | LUND Moller electron number | Overall LUND particle number | Corrected LUND header line number | Number of Particles |
---|---|---|---|---|---|
16544 | 1 | 16544 | 49632 | 49630 | 814.898350440404 |
354 | 1 | 354 | 1062 | 1060 | 556.656736645754 |
5526 | 4 | 22104 | 66312 | 66310 | 937.328333457728 |
21892 | 4 | 87568 | 262704 | 262702 | 8343.893471134810 |
![Full90 halfE MolThetaLab.png](/./images/e/ed/Full90_halfE_MolThetaLab.png)
MolThetaLabweighted->Integral()
This gives about 4.96e+23 incident electrons
For 0T with 5.5GeV incident electrons:
For 5T with 5.5GeV incident electrons: