1. DCS meeting27.Sep.2002 Serguei Zelepoukine (IHEP, Protvino) Contents: 1. Front-end electronics: problems & solutions. 2. DCS cabling outside the ECAL detector (CMS integration) 3. Other -- installation matters, the inside ECAL layout,...

2. DCS/DSS front-end electronics --- as of beg. September, 2002: Precision temperature monitoring uses T-MUX as the front-end electronics. T-MUX module includes an analog multiplexer and a transducer, thus providing signal conditioning for 8-16 channels. Transducer (RBFE from LHC cryo controls) is RAD-HARD. Analog multiplexer is NOT -- but has been tested with good results in ATLAS. Proposal: make a multiplexer part changeable and replace it each 2-5 years of operation. This requires T-MUX to be placed outside CMS (on the infrastructure ?). ---------------------------------------------------------------------------------------------------------- This same T-MUX can be used also with DSS temperature sensors. ---------------------------------------------------------------------------------------------------------- Humidity monitoring will use the same analog multiplexer part, but a different transducer.

3. RBFE 12x STP cable (to sensors) DB-25 connectors Analog MUX 12 chan Power and control Output signal Power and control Output signal Support plate (metal) TMUX board layout Serguei Zelepoukine 10.Sep.02

4. Output signals (DB-25 connector) TMUX boards Control distribution board Power distribution board Support plate Cable locking Enclosure (shield) Serguei Zelepoukine 10.Sep.02 T-MUX assembly Output signals to the counting room

5. SM_10 SM_9 SM_18 SM_1 T-MUX 1 T-MUX 9 T-MUX 1 T-MUX 9 Temperature monitoring -- T-MUX allocation (only a half of T-MUX assemblies is shown) T-MUX 10 T-MUX 11 T-MUX 10 T-MUX 11 EE EB 10 sensors per SM (EE) 10 sensors per quadrant (EE) T-MUX has 12 channels --> 1 T-MUX per SM or Quadrant Each T-MUX has 2 free inputs -- some of them are used for external auxiliary sensors. S.Zelepoukine 21.Aug.02

6. Keithley CMS detector A _2 A_1A_3 A_4 Patch panel Cavern Counting room Patch panel T-MUX assembly T-MUX assemblies -- general layout Control distribution Power supply Analog signals 120 m (top view)... Control distribution Power supply Sensors Patch panel Analog signals (conditioned) Enclosure T-MUX S.Zelepoukine 21.Aug.02

7. DCS/DSS front-end electronics --- as of end. September, 2002: CMS integration team -- T-MUX assembly can only be placed on balconies (no available space on the CMS surrounding infrastructure). This will extend raw signal paths to ~ 50m (?). Werner Lustermann -- If the front-end electronics can only be placed on balconies -- ELMB can be used as it is used now in H4, with 50 m cables... (To provide SEE protection one can have a redundant ELMB configuration -- 2x ELMB are connected to the same set of input signals, but only one of them is powered and operated. In case of unrecoverable fault it is switched off and the backup ELMB starts running. Two separate CAN buses provide additional redundancy -- for the case if unrecoverable fault blocks the whole CAN bus. EP/MIC -- RAD-HARD analog multiplexer (8 channels) design is now in progress. Samples are expected end 2002 -- beg 2003. Seems to be OK for DSS (no high precision required); should be verified for use in precision temperature monitoring.

8. TMUX Keithley x 10 x 45 PC 45 TMUX Keithley x 45 PC 45 TMUX 50 m 45 CAN ELMB 100 m PC 1 1 4 DetectorBalconyCounting room TMUX Keithley x 10 x 45 PC 45 2 8 3 CAN ELMB 6 x 10 PC

9. DCS/DSS cabling and the front-end electronics layout. Work in progress with the CMS integration team

10. S.Zelepoukine 19.Sep.02 ECAL DCS cabling and front-end electronics layout Counting room CMS Barrel Endcap Barrel Electronics

11. ECAL DCS cabling and front-end electronics Precision temperature monitoring Humidity monitoring Cabling: One cable runs from each EB SM (patch panel) and from each EE quadrant to an electronics assembly at a balcony. In total 36 + 8 = 44 cable sections. Cable type is 18x STP (diameter = 12.3 mm; MCA36P, SCEM = 04.21.48.336.5 - 18x2x0.22mm2). Several additional cables run from different points on CMS (to be defined) to electronics assemblies. These are for auxiliary external sensors; approx. quantity 10-20. Cable type is 1x STP (diameter = 5 mm; MC02P SCEM = 04.21.51.B - 0,22 mm2). Electronics: 4x electronics assemblies are foreseen (see the layout sketch). Each assembly holds several electronic boards and is mounted in a shielded enclosure. Enclosure can be placed in a standard 19” rack, or mounted standalone -- it does not need forced cooling. Approximate size is: width = 19”; height = 30 cm. Cabling: As for temperature monitoring (above) -- 44 cables sections of the same cable type. Again, 10-20 additional cable sections (like above) -- 1x STP. Electronics: The same as above -- 4x assemblies. (location - close to temp.mon assemblies, in the same rack?). S.Zelepoukine 19.Sep.02

12. Summary: 1. Revise the front-end electronics solution (reconsider ELMB, R-hard analog MUX, …). 2. Urgently (next week ?) start the first iteration of the DCS cabling layout outside ECAL; also FE location should be defined -- balconies ? 3. Cabling and sensor probes inside ECAL -- is also an urgent task (to be done ultimately in this year -- November?). 4. Installation procedures -- inside / otside ECAL. When we have to have installed sensor probes/cables? Who will make the installation job? 5. We need to have a list of relevant ECAL milestones (dates!) to see how much we are in short of time.