ITk CO 2 Cooling 2 3 1 ITk

ITk CO 2 Cooling 2. 3. 1 ITk CO 2 cooling system at SR 1 *Primary for CO 2 cooling R 744 *R 744 is ATLAS common WP L. Zwalinski & B. Verlaat - EP/DT M. Doubek, J. Noite, C. Bortolin - ATLAS 1

2. 3. 1 - CO 2 Cooling in SR 1 The DEMO inheritance will be the main cooling plant for SR 1 delivering 1000 g/s it is expected from Q 2 2022 • Additional liquid accumulator will be provided to fill empty detector loops before cooling start • The newly connected loops must start warm and be gradually cooled down • The demo cooling system can provide only one temperature: Ø All stations connected to the DEMO will have to operate at the same temperature at given time! DEMO chiller Clean Room A lot of work needed not on DT side! 2 DEMO CO 2 plant ATLAS responsibility B. Verlaat

2. 3. 1 - CO 2 Cooling in SR 1 • Preliminary P&ID prepared by M. Doubek @ ATLAS cooling team All distribution part is large separate subject! Requires dedicated controls development different from cavern manifolding. • Additional cabinet • Dedicated logic • Dedicated UIs 3 M. Doubek

2. 3. 1 - CO 2 Cooling in SR 1 • First concepts of plant, accumulator and controls integration @ SR 1 Current studies: • Floor reinforcement • 3 D integration • How to bring the equipment in? • Do we need and which special tooling? 4 C. Bortolin

2. 3. 1 - CO 2 Cooling in SR 1 • Cooling layout concept 5 M. Doubek

2. 3. 1 - CO 2 Cooling in SR 1 • Detailed test schedule 6 M. Doubek

2. 3. 1 - CO 2 Cooling in SR 1 • Summary • SR 1 distribution system is under ATLAS responsibility • It can be very complex depending on the operation modes needed • All stations connected to DEMO inheritance will have to operate @ same temperature at given time!! • Distribution requires dedicated control system extension with unique • Logic • Steppers • HW • SCADA Uis • Etc. 7

Thank You! 8

WBS 2. 3. 1: ITk CO 2 cooling system – DEMO inheritance 9