New 63U ATCA rack: thermal performances and integration challenge

To save the space in the underground counting rooms during the ATLAS phase II upgrades, aproject dedicated to the study of the impact of installing taller racks within the counting roomswas launched, analysing its cooling performance and the impact on the cooling infrastructures.A new 63U prototype rack equipped with three ATCA shelves, with open-bottom to top airflow,high-power dissipating load blades, three new prototype 2U heat exchangers and various sensorswas installed in a lab. The impact on the cooling performance of stacking three ATCA crateswithin a rack was checked, along with other critical aspects.