Krypton ejector-supported cycle for particle detector cooling below -60°C

by Luca Contiero (Norwegian University of Science and Technology (NTNU) (NO))

Wednesday 13 Dec 2023, 11:00 → 12:00 Europe/Zurich

32/1-A24 (CERN)

Future upgrades of tracking detectors at CERN with a consequent increase of luminosity and radiation damage to the sensors will require cooling beyond to what is currently deliverable by the 2PACL system operating with CO₂. The expected temperature range to be achieved by the cooling systems lies in between -60 to -80°C. At such temperature levels, the noble gas Krypton appears as an interesting candidate for the thermal management of future detectors. Conversely to CO₂, the initial gas state at ambient condition poses the need to develop a new cooling technology. Considering the different challenges introduced by the thermophysical properties of Krypton and the detector requirements, an ejector-supported cooling cycle is proposed. Design guidelines for the detector cooling loop can be drawn according to the operating temperature range. For a deeper understanding of the process, a physical-based model in Modelica was built to test different control strategies for gradual cooldown, including setpoint change and cycle response to sudden load changes, such as powering-ON and -OFF the detectors. Basic ideas will be discussed in this Training Seminar.

Presentation.pdf

Presentation.pptx