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Cable issues at the detector for HCAL Peter Göttlicher, DESY-FEB, December 12th, 2008 - Scheme of EUDET - Direction of ILD - GND - power distribution - signal individual/daisy-chain Condition as on EUDET Peter Göttlicher, DESY-FEB, December 12th, 2008 1.8A at DIF – layer end < 0.1 A in gap LDA 48 Layer ….90A/half-octant Signals from LDA to DIF Individually DIF DIF DIF No Common GND-reference ….. Service has 2 dm2/half octant What to do after EUDET? 2 Cabling EUDET EUDET-prototype: list for 130mm x 140mm Peter Göttlicher, DESY-FEB, December 12th, 2008 Sorting with CoralDraw easy, Reality will be much worse FRNC-cables are normally thicker Most is flame resistant outer jackets Cooling Cooling What is need for ILD? + GND-defining … More space! - 100A through LDA or compacter power cables - daisy-chaining signal would safe some space. Can ILD live with more (or that) space? signal 140 mm power One power+signal per Layer 3 GND in half octant –ILD Peter Göttlicher, DESY-FEB, December 12th, 2008 Resistivity of connectors: mW, 1.8A Floating Power supply mV equal potential would be nice: - bias regulated in DIF so not so sensitive as CERN/FNAL-test beam GND-bar effecting performance the order of magnitude: What really required – open ? 90A Voltage drop allowed 45A 45A To local metal PE-GND and connection to supply Wmm2 length 1m (Current 90 A / 2) / 2 Cross sec tion (0.017 ) m 2 allowed voltage 1mV 210mm2 Reasonable thickness Factor 4 more, if power at outer end 4 Power in half octant –ILD Power grouped for few DIF’s, Peter Göttlicher, DESY-FEB, December 12th, 2008 - power supply of “usual” current Floating Power supplies 90A Voltage drop allowed - voltage drops allowed local regulators for LV and bias - Keep loops small: ... GND-voltage … EMI and magnet discharge …voltage and return in ONE cable DIF DIF DIF DIF DIF DIF DIF DIF DIF DIF - With distributing the current-return connections to GND-bar the current into drops an order down!!! Thinner possible? My guess: Space for DC/DC (magnet!) not less than power-bars 5 Signal: individual/daisy-chain Peter Göttlicher, DESY-FEB, December 12th, 2008 LDA DIF DIF DIF DIF DIF EUDET: with all signals star-like to LDA The local bundle gets thick Connector space at LDA gets large DIF LDA DIF DIF DIF DIF Most in bus like cable - more time while boot - risk reduction with both ends to LDA or two connectors to LDA at both ends … Less cables, less connectors at LDA DIF DIF Individual signals Keep to minimum One cable with multiple tails Reduces space and access-blockage More time in production….. Better access in ILD 6 Summarizing Comments Peter Göttlicher, DESY-FEB, December 12th, 2008 Getting a concept conclusive for all crafts: Need to get basics from all Need in the early stage basic inclusions in the design - Concept for EUDET: Is cable count adequate for scaling to ILD? - Power/GND: Bar-like (thick wires) gets better EMI, less space - Signal: The star-like concept is not the only solution Daisy chain like reduces space requirements Other comment: Open issue? ….. Is temperature of cooling water enough to REGULATE stack temperature for SiPM? CMS plans Peltier: Other solution additional local heaters …. Every addition: More power in DIF area 7