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AMS - ECAL Feb 17 th, 2003 Page 1 M. Incagli - INFN Pisa Part III cabling Part III cabling + weight S. Di Falco, M. Incagli, F. Pilo, F. Spinella, G. Venanzoni

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AMS - ECAL Feb 17 th, 2003 Page 2 M. Incagli - INFN Pisa Part III cabling Trigger Cabling Drawings from R.Becker Two solutions studied: –horizontal EIB (rowwise) : each EIB reads out 9 PMTs –vertical EIB (columnwise) : each EIB reads out 4 or 5 PMTs

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AMS - ECAL Feb 17 th, 2003 Page 3 M. Incagli - INFN Pisa Part III cabling Rowwise – scheme of principle In this scheme the EIB communicates with the trigger card through the EDR (backplane) 6 EDR + 1 ETRG X view 6 EDR + 1 ETRG Y view X view and Y view completely separated (from trigger point of view) to JLV1 9 PMTs cables below ECAL

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AMS - ECAL Feb 17 th, 2003 Page 4 M. Incagli - INFN Pisa Part III cabling Rowwise – scheme of principle Only layers 2-7 are used by the trigger (6 out of 9 2/3) Each EDR has 2 active and 1 inactive EIBs 2 inactive EIBs from Y view are connected to the X view sector in order to have 18 EIBs per crate Y view X view

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AMS - ECAL Feb 17 th, 2003 Page 5 M. Incagli - INFN Pisa Part III cabling EIB – EDR connection X view 8 – 2 – 2 8 – 4 – 4 9 – 6 – 6 Y view 1 – 3 – 3 1 – 5 – 5 9 – 7 – 7 Number of wires which converge to each of the 2 ECAL trigger boards through backplane: 9 2 6 = 108 signal 2 2 6 = 24 DAC (9 PMT signals + 2 DAC setting/reading) x 2 connectors x 6 EDR Using I 2 C protocol saves pins and lines on the backplane (factor 4 for the MAX5980)

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AMS - ECAL Feb 17 th, 2003 Page 6 M. Incagli - INFN Pisa Part III cabling To evaluate cable length I assume that all cables converge to the calorimeter corner and then follow the diagonal support for 325 mm Along the crate I consider an average length of 425 mm The total average length from the connection point btwn ECAL and ISS is 750 mm 220 mm 325 mm

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AMS - ECAL Feb 17 th, 2003 Page 7 M. Incagli - INFN Pisa Part III cabling An average length of 250 mm has been considered, per each EIB, to reach the connection point btwn the ECAL and the ISS structure X view Y view 36 mm connection point 200 mm

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AMS - ECAL Feb 17 th, 2003 Page 8 M. Incagli - INFN Pisa Part III cabling A length of =1000mm to be added to each cable “Diagonal” paths have not been considered L = ECAL side = 640 mm X1 = 0x 4= 0 X2 = 320x 4= 1280 X3 = 640x 4= 2560 X4 = 960x 4= 3840 Y4 = 320x 1= 320 Y3 = 640x 1= 640 Y1 = 0x 5= 0 Y2 = 320x 5= 1600 Y3 = 640x 4= 2560 Y4 = 960x 4= 3840 X1X2 X3X4 Y1 Y2 Y3 Y4

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AMS - ECAL Feb 17 th, 2003 Page 9 M. Incagli - INFN Pisa Part III cabling Weight : cables Total cable length including path to crate is : L TOT = 1664cm + 24 100cm = 4064 cm Note that EDR-EIB data connection, for a readout of 9 PMTs, needs 40 wires, therefore data+trigger=51 wires 90g/m Considering a linear density of 90g/m, for a 51 wires flat cable, the weight is : total:4064cm 0.90gr/cm = 3658 gr data:3658gr (40/51) = 2869 gr trigger:3658gr (11/51) (2/3) = 526 gr unused: 3658gr (11/51) (1/3) = 263 gr

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AMS - ECAL Feb 17 th, 2003 Page 10 M. Incagli - INFN Pisa Part III cabling Weight : total 51 pin connectors: 5.35 gr Excluding the unused cable the total weight is : W = 2869gr + 526gr + (5.35gr 36) = 3588 gr datatriggerconnectors

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AMS - ECAL Feb 17 th, 2003 Page 11 M. Incagli - INFN Pisa Part III cabling Columnwise Also in this case I consider 1 cable per EIB (data+trigger) and I sum the distances to reach the EIB close to the corner To this number I add the same offset to go from the ECAL corner to the crate The result is : L TOT =2462cm+100cm 18 cm 18 2 =11966cm D = 36 mm D z x

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AMS - ECAL Feb 17 th, 2003 Page 12 M. Incagli - INFN Pisa Part III cabling Columnwise : total weight In this case, however, one needs only 35(data)+3(TRG)+2(trig DAC)=40 wires : W cab = 11966cm 0.90gr/cm (40/51) = 8447 gr W con = 5.35gr 72 = 358 gr W TOT = W cab + W con = 8805 gr The contribution of the trigger to the total is 5/40 : W TRG = 8447gr (5/40) = 1056 gr

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AMS - ECAL Feb 17 th, 2003 Page 13 M. Incagli - INFN Pisa Part III cabling Cable length: a final remark The cable length for the columnwise scheme is determined by the routing which separetes X view and Y view (1) Using a different routing for data signals (2), for a 37 wires cable and 37 pin connector the algorithm gives: L TOT =2462cm+100cm 18 4 =9662cm W = 9662cm 0.90gr/cm (37/51) + 3.5gr 72 = 6561 gr excluding the trigger cables (1) (2)

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AMS - ECAL Feb 17 th, 2003 Page 14 M. Incagli - INFN Pisa Part III cabling Summary of part III Trigger signals go to EDR and, thru backplane, to ETRG no cables directely to ETRG Trigger signals to ETRG : 108. Some extra input signals are needed to set external values (e.g. angular coefficients) or to mask input channels. Using a horizontal scheme the total cable length/weight (including connectors) is: –L TOT = 41 m –W TOT = 3.6 kg In the vertical scheme(s) : –L TOT = 111m (96m) –W TOT = 8.8kg (6.5kg)

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