m. bonesini1 tof design updates m. bonesini – infn milano
Post on 20-Dec-2015
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M. Bonesini 1
TOF design updates
M. Bonesini – INFN Milano
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M. Bonesini 2
Scintillation counter: basic element (mounting assembly)
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M. Bonesini 3
Scintillation counter construction
BC-404 or BC-420 scintillation slabs from Bicron (DTF finish)Home made plexiglass light guideHome made counter mounting (3 prototypes ready in Milano)Home made PMT holder
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M. Bonesini 4
TOF 0 station optimization
Basic element: scintillator slab 24 cm x 4 cm x 1” with plexiglass light guide, read by R4998 mod PMTs2 planes X/Y : active area 24 x 24 cm2
Cross-calibration: impinging muons+laserMechanics design (CAD) in progress
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M. Bonesini 5
CAD design for TOF0
•2 X/Y planes
•Problem: reduced capability of cross-calibration with incoming muons (as respect to staggered solution)
•But Advantage: more easy mechanics support structure and more uniform structure /less material on beamline
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M. Bonesini 6
TOF1/2 stations optimization
Basic element: scintillator slab with plexiglass light-guides read by Hamamatsu R7761 fine-mesh PMTs (TOF2) or modified R4998 (TOF1)2 planes: X,Y oriented to allow multi-hits rejection capability (48 x 48 active area, 1” thickness)Each plane is made of 8 slabs to allow cross-calibration with impinging muons (width=6 cm), using X-Y viewCalibration: overlaps + laser systemMechanics design (CAD) in progress
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M. Bonesini 7
CAD design for TOF2•2 X/Y planes
•Problem: reduced capability of cross-calibration with incoming muons (as respect to staggered solution)
•But Advantage: more easy mechanics support structure and more uniform structure/less material on beamline
ggg
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M. Bonesini 8
X/Y planes front view
890 mm500 mm
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M. Bonesini 9
X/Y planes top view
X plane
Y
Y plane
Y
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M. Bonesini 10
Plexiglass lightguides
here we will hang to support structure the scintillation counters via a comb
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M. Bonesini 11
G4MICE
G4MICE installed in Milano, to optimize TOF performances design (with help from Alessandra and Yangmur)
Hope to have results soon (multiplicity of hits, ...)
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M. Bonesini 12
Conclusion
TOF0,TOF1/TOF2 design updated CAD design in progress tests to be done soon for:
1. PMTs timing behaviour in B-field (for R7761 and R4998 mod)
2. Rate effect for R4998 mod