Stave thermal analysis Cooling connections CO2 warm Test LHCb - UT Upgrade UT Mechanics + Cooling meeting 9 June 2016 Istituto Nazionale di Fisica Nucleare Sezione di Milano Stave thermal analysis Cooling connections CO2 warm Test Simone Coelli, Mauro Monti I.N.F.N. MILANO

thermal analysis update cooling connections production for test Summary: thermal analysis update cooling connections production for test CO2 WARM Test

thermal analysis - UPDATE WORKING PLAN: URGENT ANALYSIS FOR THE NEW ASIC POSITION SYSTEMATIC STUDY ON THE DETECTOR FINAL DESIGN URGENT ANALYSIS PESSIMISTIC CASE: CENTRAL STAVE SENSOR A1.T3 (8 ASICs , MOUNTED OVER FLEXBUS CABLE) NO SLITS IN THE CERAMIC STIFFENER NO THERMAL VIAS IN THE HYBRID NO CARBON FOAM EXTENSION UNDER THE SENSOR DISTANCE ASIC-SENSOR = + 2 mm (4 mm TOTAL DISTANCE)

MODEL: ASICs DISPLACED + 2 mm Note the relative positions for: SENSOR ASIC COOLING PIPE WIRE BONDING WIRE BONDING SENSOR ASIC CARBON FOAM COOLING PIPE

thermal analysis 1 - RESULTS Sensor A1.T3-ASICs distance = 2 mm Sensor A1.T3-ASICs distance = 4 mm T MAX SENSOR = 6,4 °C T MIN SENSOR = 0,7 °C SENSOR T EXCURSION = 5,7 °C T MAX SENSOR = 7,9 °C T MIN SENSOR = 0,9 °C SENSOR T EXCURSION = 7 °C Note: Pipe external temperature set to 0 °C, local support T analysis

Next thermal analysis Will be followed by a SYSTEMATIC THERMAL STUDY: USING LAST UPDATED 3D MODEL (WE NEED TO RECEIVE IT FROM RAY) MIN-MAX ASICs-SENSOR DISTANCE WITH AND WITHOUT SLITS IN THE CERAMIC STIFFENER WITH AND WITHOUT THERMAL VIAS in the hybrid Effect of CARBON FOAM EXTENSION UNDER THE SENSORS (A1.T3) CARBON FOAM sensitivity study on thermal conductivity K = «35» W/mK

CO2 WARM TEST

COLD OPERATION ∆hl-v = 280 J/g Attention: properties are very different for Warm CO2 COLD OPERATION 20 bar saturation pressure - 20 °C saturation temperature Specific Enthalpy vapour - liquid http://www.carbon-dioxide-properties.com/CO2TablesWeb.aspx Specific Enthalpy vapour - liquid = ∆hl-v = 280 J/g at 20 bar saturation pressure, (~ - 20 °C saturation temperature)

∆hl-v = 180 J/g => 2:3 RATIO between cold and warm conditions WARM OPERATION 50 bar saturation pressure ~ 14 °C saturation temperature Specific Enthalpy vapour - liquid http://www.carbon-dioxide-properties.com/CO2TablesWeb.aspx Specific Enthalpy vapour - liquid = ∆hl-v = 180 J/g => 2:3 RATIO between cold and warm conditions at 50 bar saturation pressure, (~ 14 °C saturation temperature)

CO2 COOLING: WARM TEST / INSTALLATION CONDITIONS DATE 2016-05-26 STAVE “C” FLOW DIRECTION UPWARD INSULATION ARMAFLEX STAVE INLET RESTRICTOR 0,254 mm STEADY-STATE OK TRACI P SET POINT 50 barA SATURATION TEMP 14,3 °C WARM TEST HEATER POWER 0-75-113 W (0 -100% -150%) MASS FLOW-RATE 0,88 g/s CALCULATED X out 47 % at 100% load - 72 % at 100% load 2016-05-26-P50bar-113W-087gs-PT.txt 10

CO2 warm Test Information useful for the cooling plant design TOTAL HEATER POWER = 75 W (100 %) MASS FLOW RATE = 0,88 g/s (Xout = 47 %) P set = 50 barA (SAT =14,5 °C) WARM TEST Information useful for the cooling plant design INLET FLOW RESTRICTOR Orifice 0,254 mm Pressure drop = 3 bar Similar to cold operation

CO2 warm Test conclusion A cooling test was performed at set pressure 50 bar The power is removed from che stave in stable operation the pressure drops are similar to che cold operation test, given a similar mass flowrate near to 1 g/s of CO2. => confirm the possibility to operate with power on and with the box open, during the installation and test phase.

Cooling connections PIPE 2 mm ID / 2,5 mm OD BENDED «1 COIL» LASER WELDED VCR SWAGELOK CONNECTORS: 1/8 INCH CONNECTION TO STAVE COOLING PIPE 1/4 INCH CONNECTION TO MANIFOLD To be confirmed, 1/8 is more compact..

COMPARISON OF STAVE A/B/C Next test set-up to be mounted NEXT TEST PLANNED COMPARISON OF STAVE A/B/C ID 2 mm pipe with 1 coil mounted both at the inlet and the outlet calibrated orifice at the inlet Characterization of the stave circuit between the 2 manifolds for the three different stave «flavours» A/B/C Next test set-up to be mounted