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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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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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HAMAMATSU H9500256 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.

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Longitudinal Segmentation:40 layers with no longitudinalinformation loss.

Tranverse Segmentation:Alternating horizontal/vertical layers59 scintillator bars /layerX 40 layers = 2360 scint. bars59 bars on 64 channels (=26) Tot. 2560 channels Available PMT’s in Trieste:18 +(2 in prototype)= 20 x 64 ch. Hamamatsu R7600-03-M64+ 2x256 ch. Hamamatsu H9500-M256Available 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 channel12 layers 1 M256 3 adjacent scint.bars per channelNeeded 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)channelFollowing 8 layers= 21 grouping 2 scint.bars (2x4 x 0.7 mm) 8 fibers in each PMT (2.8x2.8mm2pixel)channelFollowing 12 layers= 31 grouping 3 scint.bars (3x4 x 0.7 mm) 12 fibers in each PMT (2.8x2.8mm2pixel)channel

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

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21 groupingnormal single tracksSingle layer digital pattern resolution Still: 33mm/2/sqrt(12) ~ 5 mm

No grouping:normal single trackssingle layer digital pattern resolution 33mm/2/sqrt(12) ~ 5 mm

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31 groupingnormal single trackssingle layer digital pattern resolution Still: 33mm/sqrt(12) ~ 10 mm

31 groupingnormal single tracksstaggered double layer digital pattern resolution Again: 33mm/2/sqrt(12) ~ 5 mm

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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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