1. Cabling and connectors for future LAV stations Mauro Raggi LAV working group CERN 26/10/2009

2. Cabling scheme signal 2 x DB37 32 ch In 32 ch IN Robinson Nugent 68Pin 10 x DB37 16 ch each FEE board VME 9U TELL1 4x128 ch TDC ANTI-A1 4x34pin scotch flex 64 ch out To be discussed with TDC group

3. Why DB37 connectors? DB37 connection allows us to connect up to 16 ch in each connector including a mass for each signal (need 10 connectors per flange for ANTI-A1 to A5) This solution reduces the cross talk (see next slide) 16 ch modularity naturally matches LAV requirements in fact: 160 ch = 10 connectors (5x32 ch) 240 ch = 15 connectors (5x48 or 4x60) 256 ch = 16 connectors (4x64) The cables are more flexible due to reduced number of coax line transmitted Connectors easier to plug on FEE PCB A firm (ECOVIDE) has been already asked for a cost estimate for a flange housing 10 DB37 : “Flangia DN 200 ISO-K in acciaio AISI 304L con 10 passanti Sub-Da 37 pin, leak tested <5x10 -9 mbar.l/sec” 4350.00 IVA esclusa. The price is similar to the DB50 solution.

4. 2x18 pins 16 pins signal 16 pins ground (all connected) 16 pins signal Connector 1Connector 2 Connector 1Connector 2 2x18 pins Present connection 50 pins DB37 cabling solution 16 pins signal 16 pins ground 5 pins spare

5. HV connections Present HV connections are OK for what concern modularity (32 ch/connector): Connectors and feedthroughs are certified up to 1KV Even if no discharge have been observed during test beam the dielectric material could be damaged after long time due high voltage out of specs Long term (10 y) behavior must be certified using termo-vacuum test under HV Pump the system with flange to 10 -7 mbar Set the HV to 2000 V Heat the system to 100 Celsius Measure current discharge with a nano-amperometer Check the vacuum with a vacuum leak detector ECOVIDE propose connectors certified for 2KV but the cost is real high 2K€ (each) The ground is now connected to the ANTI-A1 vessel. The ground connection should be brought inside using some pins in the connectors or a dedicated ground feedthrough

6. HV distributor Blocks HV spread is very near to HV distributor range limit in red. The maximum voltage is set to 1500V the minimum to 1000V We are unable to switch Off most part of the PMTs (only able to reduce the gainto few 10 5 ) HV distributor can only provide a 500V range HV HV cables have now 48 HV channels connected but only 32 used. The remaining 16 ch remain non terminated Investigation needed to change distributor output connector to match our needs (if possible)

7. LAV VME 9U custom crate Power Supply 5-8 FEE boards Custom power only bus TELL1 7-10 free slots5U We are planning to project and build a 21 slots 9U VME mechanics crate housing: 5U Power supply with custom power lines to supply the TELL1 and FEE boards 1U TELL1 board 5-8U 5-8 FEE boards 7U Still free could be used for clock and other services (need standard VME bus?) 7