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Extra-Light M1 ? (XL-M1) 20 cm (M1) vs 31 cm (M5). Why not 40 cm wires? 20 cm : “overhead” due to frames A active /A total = 103x28 cm2 / 96x20 cm2 = 150% 40 cm : “overhead” due to frames A active /A total = 103x48 cm2 / 96x40 cm2 = 129% (plus the “bonus” coming from 2 HV bars removed) Detector X0 : “20 cm” 4gaps 16%2gaps 10% “40 cm”4gaps 14%2gaps 8% Pro: many Con: wire tension scales with (40/31)**2= + 70% 2x instability limit 40-50 g >>> 70-80 g redraw pad layout (no wire pads in R4)
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40 x 200 mm2 ; 24x2 pads 20 x 100 mm2 ; 48x4 pads
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M1 MX An effect of XL-M1
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Impact on tooling : in principle all can host 48 cm chambers Halving the frames to wire on M1 Less material ( X0 and $ ) Halving the chambers to mount and test More space for cable in the crowdedmost area
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Opzione 0 (RPC, M1 4 gaps) FE-LNF408 camere1632 gaps CERN72288 PNPI3841536 8883552 Opzione 1 (no RPC, M1 2 gaps, PNPI fa M4R4, M5R4) FE-LNF408 camere1152 gaps CERN72288 PNPI5762304 FI-RM22881152 Opzione 2 (no RPC, M1 M4 M5 2 gaps, PNPI fa M4R4, M5R4) FE-LNF408 camere1008 gaps CERN72288 PNPI5761920 FI-RM2288576 1368
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