1. Examples of a gamma ray detector
The Fast Timing Array (FaTimA)
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

2. -1- Basic examples (1/3) Mono-energetic and Isotropic source
Compile NPTool for Fatima detector
npl
cmake ./ -DETLIST=“Fatima”
make
nps
Run npsimulation with the detector file Fatima.detector and the event file gamma.source
Npsimulation –D Fatima.detector –E gamma.source
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

3. -1- Basic examples (2/3) Run a simulation with 100000 events and exit:
/run/beamOn
exit
Inspect the output tree
Root –l
Root> New TBrowser()
Select file “myResult.root” in folder Outputs/Simulation/
Click on SimulatedTree and Fatima
Click on fFATIMA_labr3_E_Energy
Determine Photopeak efficiency & P/T
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

4. Geometry from K. Hauschild (CSNSM)
-1- Basic examples (3/3)
With additional passive material
Adding the GREAT chamber:
Edit the detector file Fatima.detector
Uncomment the following lines:
Run again from 1-b and determine Photopeak efficiency & P/T with chamber
Note: Karl’s definition of the GREAT can be found in NPSimulation/Core/Chamber.cc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
GeneralChamber
GREAT-Karl
Heightmin= 178.
Heightmax= 181.
Widthmin= 228.
Widthmax= 231.
Depthmin= 200.
Depthmax= 205.
MATERIAL= Alu
Geometry from K. Hauschild (CSNSM)
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

5. -2- Extended examples (1/5)
Gamma emission from a stopped reaction product
Simulating a gamma decay cascade:
Copy the event file 24Na.reaction into gdecay.beam
Edit gdecay.beam and modify the Beam section as
Remove the TwoBodyReaction section and keep the gammadecay section
Beam
Particle= 25Na
ExcitationEnergy= 2.2
Energy= 0
SigmaEnergy= 0
SigmaThetaX= 0.0
SigmaPhiY= 0.0
SigmaX= 0.5
SigmaY= 0.5
MeanThetaX= 0
MeanPhiY= 0
MeanX= 0
MeanY= 0
 Stopped Beam
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

6. -2- Extended examples (2/5)
So gdecay.beam should look like that:
Beam
Particle= 25Na
ExcitationEnergy= 2.2
Energy= 0
SigmaEnergy= 0
SigmaThetaX= 0.0
SigmaPhiY= 0.0
SigmaX= 0.5
SigmaY= 0.5
MeanThetaX= 0
MeanPhiY= 0
MeanX= 0
MeanY= 0
%%%%%%%%%%%%%%%%%%
GammaDecay 25Na
Cascade
BranchingRatio= 70
Energies= 2.2
DifferentialCrossSection= 11Li(d,3He)10He.txt Gamma25Na
BranchingRatio= 30
Energies=
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

7. -2- Extended examples (3/5)
Run npsimulation with Fatima detector and the gdecay.beam event generator
Set the tracking verbose to 1 with the command:
/tracking/verbose 1
(This will display tracking information of primary and secondary particles for each event)
Do “/run/beamOn 1” several times.
You should see some events with 1 emitted gamma ray (at 2.2 MeV) and others with 2 emitted gamma rays ( at 1 and 1.2 MeV)
Run for events and check energy spectrum as in 1-d.
Note: This could take few minutes in interactive mode so best is to run in batch mode:
Create a file run.mac conatining the command “/run/beamOn ”
Run: npsimluation –D Fatima.detector –E gdecay.beam -B run.mac
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

8. -2- Extended examples (4/5)
Gamma emission from a moving reaction product
Changing the beam energy
Edit gdecay.beam and set the beam energy to 10MeV/u
Repeat 2-e instructions
Feel free to change the beam energy, the energy spread, and the emittance
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

9. -2- Extended examples (5/5)
Starting the simulated data analysis
Perform Doppler correction
Go to nptool/Projects/Fatima/ directory (to be distributed)
Or nptool/Examples/Example3 and run:
cmake ./
make
Run the analysis:
npanalysis
This create root files in the directory nptool/Output/Analysis. The full Doppler corrected spectrum is save in the histolist.root file.
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

10. Simulating a multi-detector system
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )

11. (Note: this may take some time)
Detector Input file
Add token associated to the different detectors in the same Input file
Check overlaps with G4 command:
/geometry/test/run
(Note: this may take some time)
… Have a try with the detector of your choices …
ICC Simulation Workshop on NPTOOL (28th Nov - 1st Dec 2016 – GANIL )