Location of SVD Temperature and Humidity Monitors L.Vitale & L.Lanceri INFN & Univ. Trieste 6 th VXD Workshop, 02/10/2014 SVD parallel for discussion Sep.

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Location of SVD Temperature and Humidity Monitors L.Vitale & L.Lanceri INFN & Univ. Trieste 6 th VXD Workshop, 02/10/2014 SVD parallel for discussion Sep. 30, 2014L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa1

Brief reminder on agreed plan Sep. 30, 2014L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa2

Temperature 1: NTC Thermistors System now foresees up to 96 thermistors NTC (Betatherm 100kΩ) 24=12 pairs: 12 half-rings supporting the SVD ladders 32=16 pairs: inlets and outlets of the CO 2 cooling pipes 38 still available: a few near FOS fibers for cross-calibration, and possibly at other locations Readout based on ELMB (Embedded Local Monitor Board) 1 power supply board, 3 motherboards with ELMB and CANbus adapter, 3 x 2 current source boards, 3 x 2 x 16-channel connectors 3 Sep. 30, 2014L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa

Temperature 2 and Humidity 1 – FOS Sep. 30, 20144L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa FOS R&D completed by the IFIC group for PXD, successfully tested at the DESY beam test Jan 2014 We adopt a similar approach for SVD: one fiber per ladder, inserted in the Airex foam, with several temperature sensing points per fiber (one per DSSD in layers 4, 5, 6) Total: 38 fibers and 120 temperature sensing points Read-out of up to 40 fibers: One rack-type sm interrogation unit (16 ch), 0.5Hz 10 (4 x 1) passive couplers. => Read-out available for 8-18 additional fibers (with humidity-sensitive coating?) Moreover, humidity (to avoid condensation issues, from CO 2 cooling at -20 o C): interlock (Dew point < - 30 o C): sniffing pipes e Chilled Mirror Hygrometers Modeldescriptioncostquantitytotal sm FBG interrogator 26,000 +VAT 131,720 CP-W-P-1X x4 passive coupler 180/45 +VAT 10

Humidity 2: CMS “sniffer” approach Sep. 30, 2014L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa5 Vaisala dew point sensors: Vaisala DMT242A for the [-80, +20] C dewpoint range Vaisala DMT242B for the [-60, +60] C dewpoint range Chilled mirror: Edgetech Dewmaster Chilled Mirror Hygrometer

News, issues and details to be clarified 01/10/14VXD workshop - L.Lanceri & L.Vitale, monitoring hardware6 NTC sensors: total proposed number we already purchased 100 (1000€) Betatherm (Radhard certified by CMS). Are these really too bulky? 2.4mm ⌀ Final position and mounting on the 12 half-rings (24 sensors) Final position and mounting on inlets and outlets of the CO 2 cooling pipes (32 sensors) Reference for FOS cross-calibration: we propose 2 sensors per Layer (6 sensors) FOS: total proposed number, 38 fibers, 158 sensors: 1 sensor per DSSD both for origami and BW DSSD (inside Airex channel), where exactly? 1 sensor close to the clamp (outside Airex channel), precise distance? Note that test and calibration takes 1 day per 9 sensors in Santander! Note that procurements takes >~2 months + Humidity with different coating. 2 per layer (?) + 2 outer cylinder (?)

FOS fibers 01/10/14VXD workshop - L.Lanceri & L.Vitale, monitoring hardware7 Layer 6: 16 ladders 16 fibers x 4 (+1) sensors DOCKs (4x1)couplers … … Layer 5: 12 ladders 12 fibers x 3 (+1) sensors … … Layer 4: 10 ladders 10 fibers x 2 (+1) sensors … … Layer 6 4 couplers Layer 5 3 couplers Layer 4 3 couplers Interrogator (16 inputs) …

Location of Temperature Sensors on the fibers Sep. 30, 2014L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa8 Sensor dimension 10mm Coating: acrylate (almost insensitive to humidity) Unbuffered (just 250 um ⌀ ) from clamp to all airex channel Buffered (~900 um ⌀ ) from clamp to DOCKs with SC/PC connector? Airex channel 500 um ⌀ Yellow: buffer tube Orange: coating Blue: core

BACKUP SLIDES 01/10/14VXD workshop - L.Lanceri & L.Vitale, monitoring hardware9

Cabling NTC sensors connections to docks: – Stage 1, isolation of sensor leads – Stage 2, mounting sensor into the probe (mechanics: to be designed!) – Stage 3, soldering, isolating and labelling the individual twisted-pair cable SCEM Twisted pairs 9x2 From docks to ELMB box: – Up to 6 halogen-free, shielded multi- conductor twisted-pairs cables – Shield connected to ground at docks (?) – Readily available from CERN catalogue: SCEM Twisted pairs 21x2 External diameter: 11 mm 10

Temperature Monitoring – FOS fibers 01/10/1411VXD workshop - L.Lanceri & L.Vitale, monitoring hardware PXD FOS R&D completed successfully tested at the DESY beam test Jan 2014 Same solution can be adopted for SVD: one fiber per ladder, inserted in the Airex foam, to measure silicon temperature. One FBG temperature sensor for each of the SVD strip sensors in layers 4,5,6; 38 fibers and 120 sensors are needed. One rack-type sm interrogation unit*, ten passive couplers** 4x1 in order to have 40 channels. *Interrogation speed 0.5 Hz; Stability 0.1 ºC pm; Repeatability 0.1ºC; Accuracy 0.1ºC (only for the interrogation unit, FBG sensor error must be added);16 input channels **wide band coupler, 1x4, 1550 nm, insertion loss <7 dB, fibra SMF-28e, pigtail length 1 m tipo 900 micron loose, FC/APC connectors at both ends,(dimensions: cylindrical shape 4x65 mm).

VXD Thermal mock-up (DESY) Sep. 30, L.Vitale & L.Lanceri -- 6th VXD Meeting - Pisa PXD+SVD Front End power dissipation: W CO 2 cooling pipes (-20 o C); dry air / nitrogen flow (20 o C) A crucial moment for understanding several aspects and setting the exact location for the ambient sensors will be the PXD+SVD thermal mock-up in preparation at DESY (Oct. 2014).