[Gate-users] No coincidences recorded

[Ane Etxebeste]

Hi Andrea,
By default the minimum sector difference to generate coincidences is set 
to 2.
Since your scanner is made of two "sectors" you should accept 
coincidences between contiguos sectors.
You can do that using the following line
/gate/digitizer/Coincidences/minSectorDifference 1

I hope it helps.
Best regards,
Ane

On 2020-06-17 19:23, Andrea González wrote:
> Dear GATE users,
> 
> We are trying to acquire coincidences (ASCII output) using two LGSO
> crystals and a Ge-68 source in between. We are able to see the singles
> but, the coincidence file created is empty...
> We would appreciate if you could help us with this.
> Thank you very much,
> 
> Please see the code below:
> 
> #=====================================================
> 
> # VISUALISATION
> 
> #=====================================================
> 
> /vis/open                           OGLSX
> 
> /vis/drawVolume
> 
> /tracking/storeTrajectory           1
> 
> /vis/scene/add/trajectories
> 
> /vis/scene/endOfEventAction         accumulate
> 
> /vis/viewer/zoom 3
> 
> #=======================================================
> 
> #                   G E O M E T R Y
> 
> #=======================================================
> 
> /gate/geometry/setMaterialDatabase    ./GateMaterials.db
> 
> # W O R L D
> 
> /gate/world/geometry/setXLength 35. cm
> 
> /gate/world/geometry/setYLength 35. cm
> 
> /gate/world/geometry/setZLength 35. cm
> 
> /gate/world/setMaterial               Air
> 
> # S Y S T E M
> 
> /gate/world/daughters/name cylindricalPET
> 
> /gate/world/daughters/insert cylinder
> 
> /gate/cylindricalPET/geometry/setRmax 30. mm
> 
> /gate/cylindricalPET/geometry/setRmin 16. mm
> 
> /gate/cylindricalPET/geometry/setHeight 5 mm
> 
> /gate/cylindricalPET/placement/setTranslation    0 0 0 cm
> 
> /gate/cylindricalPET/setMaterial Air
> 
> # FIRST LEVEL OF THE SYSTEM
> 
> /gate/cylindricalPET/daughters/name box1
> 
> /gate/cylindricalPET/daughters/insert box
> 
> /gate/box1/placement/setTranslation 23. 0 0 mm
> 
> /gate/box1/geometry/setXLength 11. mm
> 
> /gate/box1/geometry/setYLength 11. mm
> 
> /gate/box1/geometry/setZLength 4. mm
> 
> /gate/box1/setMaterial Air
> 
> /gate/box1/vis/setColor yellow
> 
> # C R Y S T A L
> 
> /gate/box1/daughters/name box2
> 
> /gate/box1/daughters/insert box
> 
> /gate/box2/geometry/setXLength 10. mm
> 
> /gate/box2/geometry/setYLength 3. mm
> 
> /gate/box2/geometry/setZLength 3. mm
> 
> /gate/box2/setMaterial LGSO
> 
> /gate/box2/placement/setTranslation    0 0 0 mm
> 
> /gate/box2/vis/setColor red
> 
> # R E P E A T    R S E C T O R
> 
> /gate/box1/repeaters/insert ring
> 
> /gate/box1/ring/setRepeatNumber 2
> 
> #=======================================================
> 
> #                    Attach
> 
> #=======================================================
> 
> # A T T A C H   V O L U M E S   T O   A   S Y S T E M
> 
> /gate/systems/cylindricalPET/rsector/attach box1
> 
> /gate/systems/cylindricalPET/module/attach box2
> 
> # D E F I N E   A   S E N S I T I V E   D E T E C T O R
> 
> /gate/box2/attachCrystalSD
> 
> #/gate/box2/attachCrystalSD vglue 1cm
> 
> #=====================================================
> 
> #                  P H Y S I C S
> 
> #=====================================================
> 
> /gate/physics/addPhysicsList QGSP_BERT_EMV
> 
> # C O I N C I D E N C E   S O R T E R
> 
> /gate/digitizer/Coincidences/setWindow 10. ns
> 
> #=======================================================
> 
> #                    Source
> 
> #=======================================================
> 
> /gate/cylindricalPET/daughters/name                     cilindro
> 
> /gate/cylindricalPET/daughters/insert                   cylinder
> 
> /gate/cilindro/geometry/setRmax        12. mm
> 
> /gate/cilindro/geometry/setHeight      6. mm
> 
> /gate/cilindro/placement/setTranslation    0. 0. 0. cm
> 
> /gate/cilindro/setMaterial             PMMA
> 
> /gate/cilindro/vis/setColor            green
> 
> /gate/source/addSource Ge68
> 
> /gate/source/Ge68/setActivity 10000000 Bq
> 
> /gate/source/Ge68/gps/particle e+
> 
> /gate/source/Ge68/setForcedUnstableFlag true
> 
> /gate/source/Ge68/setForcedHalfLife 23410080. s
> 
> /gate/source/Ge68/gps/monoenergy 1889.1 keV
> 
> /gate/source/Ge68/gps/type Plane
> 
> /gate/source/Ge68/gps/shape Circle
> 
> /gate/source/Ge68/gps/radius 0.5 mm
> 
> /gate/source/Ge68/gps/angtype iso
> 
> /gate/source/Ge68/gps/centre 0. 0. 0. cm
> 
> /gate/source/list
> 
> # P H A N T O M   D E F I N E D   A S   S E N S I T I V E
> 
> /gate/cilindro/attachPhantomSD
> 
> #=====================================================
> 
> # INITIALISATION
> 
> #=====================================================
> 
> /gate/run/initialize
> 
> #=====================================================
> 
> #  D A T A   O U T P U T
> 
> #=====================================================
> 
> /gate/output/ascii/enable
> 
> /gate/output/ascii/setFileName                    LGSO_
> 
> /gate/output/ascii/setOutFileHitsFlag         0
> 
> /gate/output/ascii/setOutFileSinglesFlag      1
> 
> /gate/output/ascii/setOutFileCoincidencesFlag      1
> 
> #/gate/output/root/enable
> 
> #/gate/output/root/setFileName                    LGSO_RR
> 
> #/gate/output/root/setRootHitFlag          0
> 
> #/gate/output/root/setRootSinglesFlag      1
> 
> #/gate/output/root/setRootOpticalFlag      0
> 
> #=====================================================
> 
> # ACQUISITION
> 
> #=====================================================
> 
> /gate/application/setTimeSlice   1 s
> 
> /gate/application/setTimeStart   0 s
> 
> /gate/application/setTimeStop    30 s
> 
> /gate/application/startDAQ
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