S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun ECAL DCS status: Sensors, probes and cabling (SM/Dee) S. Zelepoukine IHEP Protvino/ETHZ

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun Outline DCS sensors (EB+EE) Sensor probes – PTM Sensor probes – HM / TSS DCS cabling – EB SM / EE Dee Conclusion

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun ECAL DCS sensors, EB+EE (1) TSS – 8 sensors (2 per module) PTM – 10 sensors (2 per module + 2 in/out cooling) HM – 4 sensors (1 per module) = 22 sensors = 22 cables (tw.pairs) 3 patch panel connectors: TSS, PTM, HM TSS (safety) PTM (precision temp.) HM (humidity) EB SM = EE quadrant

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun ECAL DCS sensors, EB+EE (2) Sensors – EB: PTM – Precision temperature monitoring: 10 sensors per SM; NTC thermistors from Betatherm. 20 reference sensors in CMS (accessible for calibration). HM – Humidity monitoring: 4 sensors per SM; sensor type to be selected from irradiation tests (in progress at CERN IRRAD-2, ECAL-Tracker collab.). 10 reference sensors in CMS (accessible for calibration). TSS – Temperature safety system: 8 sensors per SM; sensor type to be finally defined by the VINCA Belgrade group. Sensors – EE: The same sensor types and numbers as for the EB SM are planned for the EE quadrant: Radiation hardness has to be verified, since the EE fluence/dose estimates are times more than that of EB (irradiation tests are in progress, CERN IRRAD-2, ECAL-Tracker collab)

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun PTM sensor probes Precision temperature monitoring (PTM): Surface probe – SM grid / thermal screen:8 per SM. Construction: Aluminum piece (17 x 10 x 6 mm); to be fixed with 2x M2.5 screws on the grid or thermal screen surface. Location: in the center of each module (grid / th.screen sides); defined for the grid (SM0) – see the drawings by Frederic Mossiere in the next slide. Location on the thermal screen should be finally agreed with the laser monitoring team. Immersion probe – SM IN/OUT cooling pipes:2 per SM. Construction: St.steel tube (length = 55 mm; inner/outer dia = 3/4 mm); to be immersed into the cooling water flow. Location: on the SM’s entry/exit cooling pipes – see the drawings by F.Mossiere in the next slide.

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun PTM surface probe by F.Mossiere 10 mm 6 mm PTM surface probe – SM grid and thermal screen 17 mm 10 mm Material: aluminum alloy

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun PTM immersion probe 55 mm St.steel; outer / inner dia = 4 / 3 mm PTM immersion probe – SM entry / exit cooling pipes

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun HM / TSS sensor probes Humidity monitoring (HM) 1 per module  4 per SM Probe construction – to be defined. Location – to be defined (SM/Dee electronics compartment) Temperature safety system (TSS) 2 per module  8 per SM Probe construction – to be defined. Location – to be defined (SM/Dee electronics compartment)

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun DCS cabling – SM/Dee (2) A single twisted pair runs from each sensor to the patch panel. (After the patch panel two pairs, 4-wire connection, are foreseen for PTM and possibly TSS.) Pairs count / cable length: PTM pairs1.5 – 4 m HM -- 4 pairs1.5 – 4 m TSS -- 8 pairs1.5 – 4 m Cable type – the same for all three applications: Section 0.13 – 0.22 mm 2. Rad.resistant insulation. Patch panel connectors -- the same type for all three applications: Rad.resistant insulation. Crimping contacts.

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun DCS cabling (SM/Dee) – sensor cables EB SM: Max Dose = 3 x 10 3 Gy  1.5 x 10 4 Gy (safety factor = 5) PE (polyethylene) insulated cables are OK (resistance = 10 5 Gy); readily available from CERN stores. EE Dee: Max Dose = 8 x 10 4 Gy  4 x 10 5 Gy (safety factor = 5) PE cables are not resistant enough – use PA, PAI, PEI, PI, … not available at CERN – contact manufacturers/distributors. Solution – use rad.resistant cable (PA, PAI, PEI, PI, …) for both EB and EE. Total: 2 – 4 km for all DCS applications (PTM, HM, TSS). Preliminary offers: 2 –7 K EUR.

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun DCS cabling (SM/Dee) – connectors Patch panel connectors – SM / Dee EB SM: Max Dose = 4 x 10 2 Gy  2 x 10 3 Gy (safety factor = 5) EE Dee: Max Dose = 1 x 10 3 Gy  5 x 10 3 Gy (safety factor = 5) Solution – use rad.resistant connector (PE, PA, PC, PEEK, PAI, PEI, PI, …) for both EB and EE. Burndy Quickmate rectangular plastic connector is the current candidate; insulation/construction material is nylon (PA). Cost estimate: 15 K CHF (EB+EE; + spares, + tooling).

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun Conclusion - problems PTM sensors should be installed in the SM “mechanical” assembly stage – starts very soon! Hence we need to: finalize PTM probe constructions (surface and immersion probes). order PTM sensors (100K NTC thermistors, Betatherm). order cables for SM/Dee internal cabling (rad.resistant). finalize patch panel connector choice and order connectors. start production – probe/sensor/cable assembly. HM / TSS sensors should be installed in the SM “electronics” assembly stage – we still have some time to define the final probe constructions, and sensor locations (also sensor types).

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun Backup slides

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun ECAL DCS rad.environment (1) EB.1 EB.2 EB.3 EE.1 EE.2 EE.3 ECAL TDR Fig 3.1 EB.1 – thermal screen (r = 129+ cm)3 x 10 3 Gy EB.2 – grid (r = 145+ cm)4 x 10 2 Gy EB.3 – SM patch panel (r = 145+ cm)4 x 10 2 Gy EE.1 – ES side (z = 320- cm, eta = 2.9)8 x 10 4 Gy EE.2 – HE side (z = 350 cm, eta = 2.9)5 x 10 4 Gy EE.3 – HE side (z = 350 cm, eta = 1.6)1 x 10 3 Gy

S. ZelepoukineECAL DCS status, ECAL TCG 17.Jun Thermoplastics – rad.resistance Gy10 2 PE PI LCP PEI PAI PPS PEEK … PA 4.6 PA 6.6 EEEB