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Part III cabling + weight

Part III cabling + weight. S. Di Falco, M. Incagli, F. Pilo, F. Spinella, G. Venanzoni. 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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Part III cabling + weight

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  1. Part IIIcabling + weight S. Di Falco, M. Incagli, F. Pilo, F. Spinella, G. Venanzoni

  2. 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

  3. Rowwise – scheme of principle • In this scheme the EIB communicates with the trigger card through the EDR (backplane) • X view and Y view completely separated (from trigger point of view) 6 EDR + 1 ETRG X view 9 PMTs to JLV1 to JLV1 6 EDR + 1 ETRG Y view cables below ECAL

  4. 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 8 6 4 2 X view 9 7 5 3 1 Y view

  5. EIB – EDR connection • X view • 8 – 2 – 2 • 8 – 2 – 2 • 8 – 4 – 4 • 8 – 4 – 4 • 9 – 6 – 6 • 9 – 6 – 6 • Y view • 1 – 3 – 3 • 1 – 3 – 3 • 1 – 5 – 5 • 1 – 5 – 5 • 9 – 7 – 7 • 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 I2C protocol saves pins and lines on the backplane (factor 4 for the MAX5980)

  6. 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  325 mm  220 mm

  7. An average length of 250 mm has been considered, per each EIB, to reach the connection point btwn the ECAL and the ISS structure Y view X view 36 mm 36 mm connection point 200 mm

  8. X2 X1 Y4 Y2 Y1 Y3 X4 X3 • A length of 250+750=1000mm to be added to each cable • “Diagonal” paths have not been considered • L = ECAL side = 640 mm X1 = 0 x 4 = 0 X2 = 320 x 4 = 1280 X3 = 640 x 4 = 2560 X4 = 960 x 4 = 3840 Y4 = 320 x 1 = 320 Y3 = 640 x 1 = 640 Y1 = 0 x 5 = 0 Y2 = 320 x 5 = 1600 Y3 = 640 x 4 = 2560 Y4 = 960 x 4 = 3840

  9. Weight : cables • Total cable length including path to crate is : • LTOT = 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 • 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

  10. Weight : total • 51 pin connectors: 5.35 gr • Excluding the unused cable the total weight is : W = 2869gr + 526gr + (5.35gr  36) = 3588 gr data trigger connectors

  11. Columnwise z D = 36 mm D • 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 : LTOT=2462cm+100cm184 + 64cm182 =11966cm x

  12. Columnwise : total weight • In this case, however, one needs only 35(data)+3(TRG)+2(trig DAC)=40 wires : Wcab = 11966cm  0.90gr/cm  (40/51) = 8447 gr Wcon = 5.35gr  72 = 358 gr WTOT = Wcab + Wcon = 8805 gr • The contribution of the trigger to the total is 5/40 : WTRG = 8447gr  (5/40) = 1056 gr

  13. 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: LTOT=2462cm+100cm184 =9662cm • W = 9662cm  0.90gr/cm  (37/51) + 3.5gr  72 = 6561 gr excluding the trigger cables (2) (1)

  14. 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: • LTOT = 41 m • WTOT = 3.6 kg • In the vertical scheme(s) : • LTOT = 111m (96m) • WTOT = 8.8kg (6.5kg)

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