ATLAS ITk - Activities Common Mechanics group (Lukasz Zwalinski, Paolo Petagna, … ) Plant →PP1 DEMO & BABY DEMO 14/03/2016C. Rossi - INFN Genova1 Detector group (Danilo Giugni,…) PP1 → Detector 8 Pump Staves Transfer line 5 6 PP2 PP1 Plant in USA15 Chiller 7 A.ATLAS ITk cooling system B.Pixel detector activities Splitting Box

ATLAS ITk – Cooling system Prototype plant built to demonstrate operation of a single CO2 plant (15kW) + redundancy approach operation suitable for ATLAS and CMS. (end of 2019) DEMO ATLAS Pixel needs to know the min achievable cooling temperature Input needed for the ATLAS ITk Pixel Technical Design Report (end of 2017). BABY-DEMO One PP2 loop + corresponding CO2 Plant (≈ 1.5kW) 14/03/2016C. Rossi - INFN Genova2

For both the common mechanics and detector group → main challenges for the distribution design are concentrated in PP2 to PP1 distribution lines and the detector evaporator loop Cold temperature ability of the detector evaporator loops depends on: -low-temperature capability of the plant -pressure gradients from detector to plant BD1: design, construction, operation of small cooling plant (Krakow CUT) BD2: design, construction, R&D of full scale PP2 distribution line (Institutes & CERN) BD1 & BD2 will be coupled and tested to demonstrate the full system loop performance in realistic conditions with a representative prototype detector loop at CERN 14/03/2016C. Rossi - INFN Genova3 Part of the cooling R&D activity the a can be done by a collaboration of INFN institutes but the qualification tests must be CERN ATLAS ITk – cooling

ATLAS ITk - Activities Common Mechanics group (Lukasz Zwalinski, Paolo Petagna, … ) Plant and distribution up to PP1 DEMO & BABY DEMO 14/03/2016C. Rossi - INFN Genova4 Detector group (Danilo Giugni,…) Distribution from PP1 to detector A.ATLAS ITk cooling system B.Pixel detector activities

ATLAS ITk – Pixel detector activities 14/03/2016C. Rossi - INFN Genova5 1.Studies on the global thermal efficiency of the pixel local supports → This activity will be done at CERN in SR1 2.Thermal testing for material characterization of the materials used for the different pixel designs (complementary to SR1 tests). The thermal conductivity measurements are strongly influenced by thermal radiation and conduction through air for high conductivity materials (e.g. TPG, Carbon Foam, …) → qualification in a measuring chamber (≈1 m 3 ) with multi-layer super insulator radiation shield + vacuum pressure < mbar. Results: -drive the design/optimization process -input for numerical simulations. The tests should be independently repeated. 3.Other activities, … Different activities can be done also for the Pixel detector group

14/03/2016C. Rossi - INFN Genova ATLAS ITk – INFN – Sezione di Genova 6 ATLAS Genova lab: Dynamic climate chamber BINDER MK53 T range (-40÷180)°C T uniformity (0.4÷2)°C, depending on set point T fluctuation (0.1÷0.5)°C, depending on set point Chiller LAUDA RK 20 KS T range (-40÷150)°C T accuracy 0.1°C Bath volume (11÷18)L Cooling capacity at 20°C 0.8 kW Chiller LAUDA Proline RP 855 T range (-55÷200)°C T accuracy 0.01°C Bath volume (5.5÷8)L Cooling power at 20°C 1.6 kW Thermal Imaging Camera FLIR SC 620 Accuracy ±2°C or ±2% of reading Thermal sensitivity 40 mK at 30°C T range (-40÷500)°C Coordinate Measuring Machine DEA Mistral Axis lengths [mm]: X=660 Y=710 Z=460 Accuracy: L/1000 (ISO 10360) (Calibration showed an average accuracy ±4.5 µm) Probe Model (head): PH10M PLC Siemens S7-300

14/03/2016C. Rossi - INFN Genova ATLAS ITk – INFN – Sezione di Genova 7 INFN – Genova resources: C. Rossi, Engineer G. Gariano, Technician A. Rovani, Technician Support of the mechanical design office Support of the mechanical workshop INFN – Genova is interested in: -Study design and prototyping of the splitting box (PP1 – PP2, PP2 – Detector) or -Measuring chamber and thermal qualification of the pixel mechanical components To be discussed at the ATLAS ITk cooling meeting 15 – 16 March Where the sharing of responsabilities for the BABY-DEMO will be defined