1. 1 Design Status for SW (Electron Muon Ranger) Gianrossano Giannini, Pietro Chimenti, Erik Vallazza, Stefano Reia (M.T.), Dario Iugovaz(M.T.), Mauro Bari(E.T.), Giulio Orzan(E.T.) Trieste INFN and Trieste University- Physics Department +Michela Prest, Valerio Mascagna (Como Univ. and INFN-MiB) MICE-PID Phone conf. 26 May 2008

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6. 6 The bars will be made with the Minerva die set which gives a triangle with a base of 33mm and ht. of 17 mm nominal. Alan Each layer 59 triangular bars: 30 triangular bars x 33 mm =990 mm + 29 matching triangular bars Each layer Active Scintillator region : 990 mm x 990 mm x 17 mm Thickness with fiberglass cover~18 mm Total=18 mm x 40 layers = 720 mm Half triangular edge mechanical elements

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8. 8 HAMAMATSU H9500 256 channels “FlatPanel” MAPMT (16x16 pixels 2.8x2.8 mm 2 each) (9 <0.9 mm fibers/pix~ 3sc.) 2 H9500 (total 512 channels 2.8x2.8 mm 2 ) Ordered by Trieste Univ. Phys.Dpt.

9. 9 Longitudinal Segmentation: 40 layers with no longitudinal information loss. Tranverse Segmentation: Alternating horizontal/vertical layers 59 scintillator bars /layer X 40 layers = 2360 scint. bars 59 bars on 64 channels (=2 6 ) Tot. 2560 channels Available PMT’s in Trieste: 18 +(2 in prototype)= 20 x 64 ch. Hamamatsu R7600-03-M64 + 2x256 ch. Hamamatsu H9500-M256 Available channels= 64x20 +2*256= 1280+512 = 1536 (< 2560) Proposed grouping: 20 layers  20 M64 (= 1 per layer) 1 scint.bar per channel 8 layers  1 M256 2 adjacent scint.bars per channel 12 layers  1 M256 3 adjacent scint.bars per channel Needed electronics: 64x20 +256x2=1536 channels of digital pattern (+ at least from last PMT dynodes  22 channels of waveform digitizers) First 20 layers= No grouping 1 scint.bar (4 x 0.7 mm) fibers in each PMT (2x2mm 2 pixel)channel Following 8 layers= 2  1 grouping 2 scint.bars (2x4 x 0.7 mm) 8 fibers in each PMT (2.8x2.8mm 2 pixel)channel Following 12 layers= 3  1 grouping 3 scint.bars (3x4 x 0.7 mm) 12 fibers in each PMT (2.8x2.8mm 2 pixel)channel

10. 10 40 layers= 20 +8(4x2)+12(4x3)

11. 11 2  1 grouping normal single tracks Single layer digital pattern resolution Still: 33mm/2/sqrt(12) ~ 5 mm No grouping: normal single tracks single layer digital pattern resolution 33mm/2/sqrt(12) ~ 5 mm

12. 12 3  1 grouping normal single tracks single layer digital pattern resolution Still: 33mm/sqrt(12) ~ 10 mm 3  1 grouping normal single tracks staggered double layer digital pattern resolution Again: 33mm/2/sqrt(12) ~ 5 mm

13. 13 Construction time estimate: 2 layers per week  40 layers in 20 weeks = ~ 5 months In case one wants no grouping at all and 1 waveform digitizer per layer: 20 more M64 PMT’s are needed (cost = 20 x 1600 Euro = 32 k Euro) Total 40 WFD chs.

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