Transcript 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.

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
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
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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.
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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
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40 layers= 20
+8(4x2)+12(4x3)
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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) ~115 mm
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
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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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