CO 2 cooling system for Insertable B Layer detector into the ATLAS experiment

1. CO2 cooling system forInsertable B Layer detector into the ATLAS experiment L. Zwalinski, C. Bortolin, T. Blaszczyk, S. Berry, F. Corbaz, G. Glonti, O. Crespo-Lopez, J. Godlewski, M. Lippert, S. Nichilo, M. Ostrega, M. van Overbeek, P. Petagna, E. Roeland, B. Verlaat, S.Vogt, M. Zimny Lukasz Zwalinski

2. ATLAS experiment Diameter: 25m Length: 46m Barrel Toroid Length: 26m Overall weight: 7000 tonnes ~100 million electronic channels 3000 km of cables Lukasz Zwalinski

3. IBL detector • ATLAS IBL Info: • Number of staves: 14 • Number of modules per stave (single/double FE-I4) 32 /16 • Pixel size (f; z) 50, 250 um • Required cooling power: 1500W • Tevap min at 1.5kW = - 400C • Tevapmaxat 1.5kW = + 200C Lukasz Zwalinski

4. Where do we come from? 2PACL concept Previous experience Preparation study ATLAS IBL AMS 2 CORA MARCO LHCbVelo 2014 2008 2009 2010 2011 2012 Lukasz Zwalinski

5. CO2 cooling plants Designed cooling power at -400C = 3kW • Main system elements: • 2independent, redundant cooling plant cores • 2independent, redundant two stage chillers • 1commonaccumulatorwith redundant control • Common interconnection piping for maintenance operations including vacuum pump • Integrated internal by pass and small evaporator for stand-by operation Lukasz Zwalinski

6. CO2 cooling primary chiller • Main system elements: • R404a 2 stage compressor • Air cooled and water cooled condenser • Hot gas bypass & liquid injection Commercial standard refrigeration chiller capable to work from zero to full IBL load! Lukasz Zwalinski

7. Cooling system inside the service cavern Lukasz Zwalinski

8. CO2 distribution from plant into detector ~100m concentric transfer line from manifolds to plant in service cavern UX15 Lukasz Zwalinski

9. Transfer lines USA15 Service cavern UX15 Experimental cavern Service gallery Transfer line installed in October ‘13 Lukasz Zwalinski

10. Fluid distribution inside toroid area 3kW dummy load heater Junction box Manual valves Sensors and inst. connection Manifold box Rotatable connector Vacuum flexible to vac. manifold Lukasz Zwalinski

11. Detector interconnections • 14 staves of 70W each connected via concentric 29m long loops to manifolds in the muon area • Cross flow of the CO2 • Required min. vacuum level 10-3 mbar • Standard vacuum components capable to work in the vicinity of the magnetic filed. • Required constant pumping Lukasz Zwalinski

12. Control system Fully commissioned! Controls: • Schneider PLCs: 2x Premium + 1x 340 M all in technical network • SCADA based on Siemens WinCC OA 3.11 • PLC and SCADA software based on UNifiedIndustrial COntrolSystem (UNICOS)Continuous Process Control CPC6of CERN • WAGO Ethernet IP distributed I/Os in privet network • Access control via e-groups • Long term data storage in LHC logging data base • Grouped alarms send via LASER to CERN Control Centre (CCC) • Communication to the Detector Control System (DCS) uses Data Interchange Protocol (DIP) • Additional direct MODBUS communication to DCS for critical data • Hard wired signals connected to Detector Safety System (DSS) • Siemens local touch screens used for the redundancy and safety needs Electricity and power distribution: • Standard industrial components (ABB, Siemens, etc.) • 24V DC hot swappable redundant power supplies IBL A UNICOS object list • Few numbers for ATLAS IBL CO2 cooling software: • ~230k lines of PLC code • 366 alarms and interlocks • 81 user interface panels PH-DT standard common for ATLAS and CMS CO2 cooling systems (including TIF and P5 of CMS) Lukasz Zwalinski

13. User interfaces Lukasz Zwalinski

14. Typical cold operation Cool down In current configuration 3kW is to much for -40’C operation, unable to hold set-point (green line) Pressurization of the system -40’C set-point reached -35’C set point 3kW 2kW 1kW Lukasz Zwalinski

15. Typical cold operation SP = -35’C Compressor at full speed, temperature of liquid increases 2000W 1500W 1000W 2500W 500W 0W Junction box temperature Margin of sub cooling must be maintained. >10’C for safe operation Capable of maintaining set point from 0 to 3kW Chiller temperature and CO2 liquid Lukasz Zwalinski

16. Typical reaction on load changes Aggressive control in turbo-mode Freon injection valve Chiller super heating (Control input) Temporarily accumulator cooling stops to give priority to CO2 liquid cooling Junction box heat load (1.5 kW) Junction box saturation Accumulator saturation turbo-mode needed to remain sub cooling CO2 liquid temperature Turbo-mode bit Lukasz Zwalinski

17. Summary • All cooling units are running relatively smooth. • All electrical and control verification and checks are completed. • Commissioning continues via junction box until final connection with the detector is completed. • First observations shows: • -40’C operation is more critical than expected • -35’C operation is okay up to 3kW • More heat load in liquid pump, meaning a higher needed minimum sub cooling. • Direct effect on the lowest possible temperature. Lukasz Zwalinski

18. Thank You. ATLAS IBL CO2 cooling team: L. Zwalinski, C. Bortolin, T. Blaszczyk, S. Berry, F. Corbaz, G. Glonti, O. Crespo-Lopez, J. Godlewski, M. Lippert, S. Nichilo, M. Ostrega, M. van Overbeek, P. Petagna, E. Roeland, B. Verlaat, S.Vogt, M. Zimny Lukasz Zwalinski