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T: Fachverband Teilchenphysik

T 93: Detektorsysteme VI

T 93.7: Vortrag

Donnerstag, 28. März 2019, 17:30–17:45, H08

Thermal performance measurements of petals for the ATLAS ITk strip detector upgrade — •Jan-Hendrik Arling — Deutsches Elektronen-Synchrotron DESY, ATLAS group, Hamburg — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Dortmund

The Inner Tracker (ITk) is the new tracking detector for the phase-II upgrade of the ATLAS experiment, meant to meet the challenges at the high-luminosity LHC. The forward regions (end-caps) will be populated with modules consisting out of silicon micro-strip sensors with readout and power electronics. These modules are directly glued on local support structures (petal core), consisting of carbon fiber-based sandwich structures with embedded titanium cooling pipes as well as data and power buses. This structure has to provide mechanical stability while minimizing material and allows for evaporative CO2 cooling of sensors and electronics. The combination of modules and support structure is a petal.
For the optimization of the petal design, petal core prototypes as well as a thermo-mechanical petal prototype, fully loaded with dummy silicon modules emulating the real heat load, were constructed. A set of measurements has been performed on these objects to validate the petal design. One type of tests is to assess the thermo-mechanical behaviour using dual-phase CO2 cooling by applying infrared thermography on it. In a developed setup experimental results for the prototypes were taken and used to validate FEA simulations.
In this talk, results in terms of thermal performance of the petal as well as properties of the CO2 cooling will be discussed.