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Status of Geant4 Veto Simulation. E.Leonardi, M.Serra, P.Valente INFN Roma NA48/3 Veto group meeting – April 20 th , 2005. Goals. Geant4 simulation of g large angle veto CKMCal : Lead/Scintillating tiles with WLS readout SpaCal : Lead/Scintillating fibers with lightguide readout - PowerPoint PPT Presentation
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Status of Geant4 Status of Geant4 VetoVeto SimulationSimulation
E.Leonardi, M.Serra, P.ValenteE.Leonardi, M.Serra, P.ValenteINFN RomaINFN Roma
NA48/3 Veto group meeting – April 20NA48/3 Veto group meeting – April 20thth, 2005, 2005
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 22
GoalsGoals
Geant4 simulation of Geant4 simulation of large angle large angle vetoveto– CKMCalCKMCal: Lead/Scintillating tiles with : Lead/Scintillating tiles with
WLS readoutWLS readout– SpaCalSpaCal: Lead/Scintillating fibers with : Lead/Scintillating fibers with
lightguide readoutlightguide readout Use layout in ProposalUse layout in Proposal
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GeometryGeometry
CKMCalCKMCal– Two veto rings, 16 trapezoidsTwo veto rings, 16 trapezoids– Tile planes Tile planes to beam axis to beam axis– Tile planes staggered in Tile planes staggered in – Aluminum support enclosureAluminum support enclosure
SpaCalSpaCal– Fibers Fibers to beam axis to beam axis– Aluminum support enclosureAluminum support enclosure
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Beam Axis
27.7
5cm
42.5 cm
30
cm
Aluminum ScintillatorLead
1 mm
1 cm
CKMCalCKMCal
Flat bottom face…
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Beam Axis
Aluminum ScintillatorLead
1 cm
1 mm
SpaCalSpaCal
2.5 m
24 c
m
29
.9
cm
C-shape module straightened…
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 66
Geometrical Geometrical ParametersParameters Aluminum supportAluminum support
– Covers front, back, and bottom surfaces of brickCovers front, back, and bottom surfaces of brick– Thickness=0.1, 1, 0.1 cmThickness=0.1, 1, 0.1 cm
FibersFibers– KLOE-style hexagonal arrangementKLOE-style hexagonal arrangement =1 mm, =1 mm, ΔΔx=1.35 mm, x=1.35 mm, ΔΔy=1.17 mmy=1.17 mm– ~70000 fibers/brick~70000 fibers/brick 20 X20 X00
TilesTiles– 5 mm Scintillator, 1 mm Lead5 mm Scintillator, 1 mm Lead– 68 tiles/brick68 tiles/brick 16 X16 X00
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 77
CKMCal readoutCKMCal readout
4 PMT’s per sector4 PMT’s per sector 64 PMT’s per veto ring64 PMT’s per veto ring
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SpaCal readoutSpaCal readout
4x4 or 4x6 PMT’s per 4x4 or 4x6 PMT’s per sideside
64 or 96 PMT’s per veto 64 or 96 PMT’s per veto ringring
Winston lightguideWinston lightguide
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Positions, Positions, and E and E
small small 0.1 – 1 GeV0.1 – 1 GeV
small small 0.1 – 1 GeV0.1 – 1 GeV
large large 0.05 – 0.1 GeV0.05 – 0.1 GeV
large large 0.05 – 0.1 GeV0.05 – 0.1 GeV
11
22
33
4455
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 1010
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 1111
Digitization: CKMCalDigitization: CKMCal
LLyy==1010 p p.e..e./MeV/MeV– ConservativeConservative light light yield from CKM yield from CKM
measurementsmeasurements– Includes light production, attenuation, Includes light production, attenuation,
collection and conversioncollection and conversion
NNp.e.p.e.==i i ΔΔEEi i xx L Lyy
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CKMCal photoelectronsCKMCal photoelectrons
thr.=5 p.e.
PMT 0 PMT 1
PMT 2 PMT 3
100 MeV 100 MeV , position 2, position 2
13131414
1515
1212
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CKMCal photoelectronsCKMCal photoelectrons100 MeV 100 MeV , position 2, position 2
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CKMCal photoelectronsCKMCal photoelectrons100 MeV 100 MeV , position 2, position 2
1213
PMT 0PMT 0
PMT 1PMT 1
PMT 2PMT 2PMT 3PMT 3
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CKMCal photoelectronsCKMCal photoelectrons100 MeV 100 MeV , position 2, position 2Slice 12 Slice 13
PMT 0PMT 0 PMT 0PMT 0PMT 1PMT 1 PMT 1PMT 1
PMT 2PMT 2 PMT 2PMT 2PMT 3PMT 3 PMT 3PMT 3
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 1616
CKMCal p.e.CKMCal p.e.
Highest photoelectron signal distributionInefficiency vs. threshold
No digi=49 events
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 1717
Digitization: SpaCalDigitization: SpaCal
L=25 ph/MeVL=25 ph/MeV Light productionLight production
==320 cm320 cmLight attenuation lengthLight attenuation length
C=0.93C=0.93 Light-guide efficiencyLight-guide efficiency
Q=0.2Q=0.2 Photocathode quantum Photocathode quantum efficiencyefficiency
NNp.e.p.e.==i i ΔΔEEi i xx L L xx exp(-d exp(-dii//) ) xx C C xx Q Q
L and L and for Kuraray SCSF-81 from for Kuraray SCSF-81 from A.Antonelli et al. NIM A 370 (1996) 367A.Antonelli et al. NIM A 370 (1996) 367
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SpaCal photoelectronsSpaCal photoelectrons
100 MeV 100 MeV , position 1, position 1 100 MeV 100 MeV , position 2, position 2
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 1919
ResultsResults
veto 0 veto 1
veto 0 veto 1 SpaC
al
SpaC
al
CK
MC
al
CK
MC
al
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 2020
PositionPosition EnergyEnergy No digiNo digi
in 0in 0No digiNo digi
in 0+1in 0+1No No interactioninteraction
0+10+1
InefficiencyInefficiency
11 100 MeV100 MeV 608608 608608 606606 6.08e-36.08e-3
1 GeV1 GeV 163163 163163 163163 1.63e-31.63e-3
22 100 MeV100 MeV 5353 4949 4444 4.9e-44.9e-4
1 GeV1 GeV 66 55 55 5e-55e-5
33 100 MeV100 MeV 13291329 767767 00 7.67e-37.67e-3
1 GeV1 GeV 1010 11 00 1e-51e-5
44 100 MeV100 MeV 57965796 11841184 33 1.18e-21.18e-2
1 GeV1 GeV 18911891 33 11 3e-53e-5
55 100 MeV100 MeV 9974999749 22882288 4343 2.29e-22.29e-2
1 GeV1 GeV 9918199181 1414 99 1.4e-41.4e-4
11
22
33
4 54 5
small small PositionPosition EnergyEnergy No digiNo digi
in 0in 0No digiNo digi
in 0+1in 0+1No No interactioninteraction
0+10+1
InefficiencyInefficiency
11 100 MeV100 MeV 2121 1919 1515 1.9e-41.9e-4
1 GeV1 GeV 11 11 00 1e-51e-5
22 100 MeV100 MeV 1414 1313 1313 1.3e-41.3e-4
1 GeV1 GeV 11 11 11 1e-51e-5
33 100 MeV100 MeV 29832983 28092809 00 2.81e-22.81e-2
1 GeV1 GeV 4949 55 00 5e-55e-5
44 100 MeV100 MeV 1767617676 53775377 22 5.38e-25.38e-2
1 GeV1 GeV 97399739 1414 00 1.4e-41.4e-4
55 100 MeV100 MeV 9082690826 41484148 1313 4.15e-24.15e-2
1 GeV1 GeV 8893888938 2727 33 2.7e-42.7e-4N=10N=1055
SpaC
al
SpaC
al
CK
MC
al
CK
MC
al
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 2121N=10N=1055
11
22
33
4 54 5
large large
PositionPosition EnergyEnergy No digiNo digi
in 0in 0No digiNo digi
in 0+1in 0+1No No interactioninteraction
0+10+1
InefficiencyInefficiency
11 50 MeV50 MeV 9508095080 9508095080 9429494294 9.51e-19.51e-1
100 MeV100 MeV 9420694206 9420694206 9375193751 9.42e-19.42e-1
22 50 MeV50 MeV 1640516405 1640516405 1270112701 1.64e-11.64e-1
100 MeV100 MeV 1287512875 1287512875 95219521 1.29e-11.29e-1
33 50 MeV50 MeV 11001100 11001100 986986 1.1e-21.1e-2
100 MeV100 MeV 549549 549549 545545 5.49e-35.49e-3
44 50 MeV50 MeV 452452 452452 443443 4.52e-34.52e-3
100 MeV100 MeV 168168 168168 168168 1.68e-31.68e-3
55 50 MeV50 MeV 9965099650 9962999629 9044090440 9.96e-19.96e-1
100 MeV100 MeV 9977299772 9975999759 8976089760 9.98e-19.98e-1
PositionPosition EnergyEnergy No digiNo digi
in 0in 0No digiNo digi
in 0+1in 0+1No No interactioninteraction
0+10+1
InefficiencyInefficiency
11 50 MeV50 MeV 9873198731 9873198731 8893488934 9.87e-19.87e-1
100 MeV100 MeV 9895798957 9895798957 8777087770 9.9e-19.9e-1
22 50 MeV50 MeV 17621762 17621762 872872 1.76e-21.76e-2
100 MeV100 MeV 587587 587587 397397 5.87e-35.87e-3
33 50 MeV50 MeV 411411 411411 99 4.11e-34.11e-3
100 MeV100 MeV 5454 5454 22 5.4e-45.4e-4
44 50 MeV50 MeV 44 44 33 4e-54e-5
100 MeV100 MeV 00 00 00 00
55 50 MeV50 MeV 9944699446 9944099440 8676686766 9.94e-19.94e-1
100 MeV100 MeV 9960599605 9960099600 8553385533 9.96e-19.96e-1
SpaC
al
SpaC
al
CK
MC
al
CK
MC
al
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PositionPosition EnergyEnergy No digiNo digi
in 0in 0No digiNo digi
in 0+1in 0+1No No interactioninteraction
0+10+1
InefficiencyInefficiency
11 100 MeV100 MeV 608608 608608 606606 6.08e-36.08e-3
1 GeV1 GeV 163163 163163 163163 1.63e-31.63e-3
22 100 MeV100 MeV 5353 4949 4444 4.9e-44.9e-4
1 GeV1 GeV 66 55 55 5e-55e-5
5 GeV5 GeV 88 88 77 8e-58e-5
33 100 MeV100 MeV 13291329 767767 00 7.67e-37.67e-3
1 GeV1 GeV 1010 11 00 1e-51e-5
5 GeV5 GeV 66 00 00 00
44 100 MeV100 MeV 57965796 11841184 33 1.18e-21.18e-2
1 GeV1 GeV 18911891 33 11 3e-53e-5
5 GeV5 GeV 16271627 00 00 00
55 100 MeV100 MeV 9974999749 22882288 4343 2.29e-22.29e-2
1 GeV1 GeV 9918199181 1414 99 1.4e-41.4e-4
5 GeV5 GeV 9761497614 88 66 8e-58e-5
11
22
33
4 54 5
small small
N=10N=1055
CK
MC
al
CK
MC
al
No significative change going from 1 to 5 GeVNo significative change going from 1 to 5 GeV
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(Old)(Old) ToDo list ToDo list 1 1
More statistics More statistics from 10from 1044 to 10 to 1055 events events (OK?)(OK?) MMore test configurationsore test configurations
– More points on brick (bottom surface) More points on brick (bottom surface) OKOK– More realistic photon beam More realistic photon beam OK (for SpaCal)OK (for SpaCal)– Energy/Angular distribution? Energy/Angular distribution? Yes... still roughYes... still rough
Improve geometry/set-upImprove geometry/set-up– Use multiple phototubes per brick Use multiple phototubes per brick OKOK– Add separatAdd separationion layerlayer (adjacent bricks) (adjacent bricks) Not Not
yet…yet… Improve Improve light collection/light collection/digitization digitization
realistic parameters, realistic parameters, but not yet full digitizationbut not yet full digitization
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 2424
(Old)(Old) ToDo list ToDo list 2 2
More complex setupMore complex setup– Add more bricks along the beam axis Add more bricks along the beam axis
2 rings now…2 rings now… (OK? easy to add more)(OK? easy to add more)– Use real brick shape Use real brick shape OK OK (for TileCal)(for TileCal)
Test different layouts to optimize detector Test different layouts to optimize detector efficiencyefficiency– Pb/Sci ratio Pb/Sci ratio Not yet…Not yet… but now readybut now ready– Aluminum thickness Aluminum thickness OK?OK?– Read-out Read-out Not yet…Not yet… but now readybut now ready
20/04/200520/04/2005 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group MeetingE.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting 2525
(New)(New) ToDo list 3 ToDo list 3
Use FLYO output as Use FLYO output as -beam gun -beam gun (z along tube, (z along tube, , E), E)
Compare with existing data?Compare with existing data?