1. M. Bonesini1 TOF design updates M. Bonesini – INFN Milano

2. M. Bonesini2 Scintillation counter: basic element (mounting assembly)

3. M. Bonesini3 Scintillation counter construction BC-404 or BC-420 scintillation slabs from Bicron (DTF finish) Home made plexiglass light guide Home made counter mounting (3 prototypes ready in Milano) Home made PMT holder

4. 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 PMTs 2 planes X/Y : active area 24 x 24 cm 2 Cross-calibration: impinging muons+laser Mechanics design (CAD) in progress

5. 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

6. 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 view Calibration: overlaps + laser system Mechanics design (CAD) in progress

7. 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

8. M. Bonesini 8 X/Y planes front view 890 mm500 mm

9. M. Bonesini 9 X/Y planes top view X plane Y Y plane Y

10. M. Bonesini 10 Plexiglass lightguides here we will hang to support structure the scintillation counters via a comb

11. 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,...)

12. 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