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Design Status for SW (Electron Muon Ranger) Gianrossano Giannini, Pietro Chimenti,

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

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Design Status for SW (Electron Muon Ranger) Gianrossano Giannini, Pietro Chimenti,

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  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

  2. 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 Half triangular edge mechanical elements 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

  3. HAMAMATSU H9500 256 channels “FlatPanel” MAPMT (16x16 pixels 2.8x2.8 mm2 each) (9 <0.9 mm fibers/pix~ 3sc.) 2 H9500 (total 512 channels 2.8x2.8 mm2 ) Ordered by Trieste Univ. Phys.Dpt.

  4. Tranverse Segmentation: Alternating horizontal/vertical layers 59 scintillator bars /layer X 40 layers = 2360 scint. bars 59 bars on 64 channels (=26) Tot. 2560 channels Longitudinal Segmentation: 40 layers with no longitudinal information loss. 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 (2x2mm2pixel)channel Following 8 layers= 21 grouping 2 scint.bars (2x4 x 0.7 mm) 8 fibers in each PMT (2.8x2.8mm2pixel)channel Following 12 layers= 31 grouping 3 scint.bars (3x4 x 0.7 mm) 12 fibers in each PMT (2.8x2.8mm2pixel)channel

  5. 40 layers= 20 +8(4x2)+12(4x3)

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

  7. 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

  8. 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. Construction time estimate: 2 layers per week 40 layers in 20 weeks = ~ 5 months

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