SMuK 2021 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Instrumentation VI

HK 18.5: Vortrag

Mittwoch, 1. September 2021, 17:45–18:00, H2

Calibration of Pt100-temperature sensors in an electromagnetic calorimeter — •Samet Katilmis¹, Frank Maas^1,2,3, Alexander Greiner¹, Julian Moik¹, Oliver Noll¹, David Rodriguez Pineiro¹, Sahra Wolff¹, Luigi Capozza¹, Alaa Dbeyssi¹, Peter-Bernd Otte¹, and Dong Liu¹ for the PANDA collaboration — ¹HI-Mainz, Mainz, Germany — ²Institute of Nuclear Physics, Mainz, Germany — ³PRISMA Cluster of Excellence, Mainz, Germany

The PANDA Backward Endcap Calorimeter (BWEC) consists of tightly packed PbWO scintillators with a highly temperature dependent light yield (LY). The LY increases by 3% per ^∘C with decreasing temperature to a value of 500 photons per MeV at -25^∘C and thus has to be monitored to avoid a deterioration of the energy resolution. The flat sensors consist of a thin Platinum wire covered by two kapton sheets. They fit between the tight structure of the scintillator matrix of the calorimeter because of their low thickness. The resistance of the platinum wire changes with its temperature and can be measured with the method of "four terminal sensing" which allows the use of long cable lengths. All the flat sensors show a different characteristic resistance-temperature relation and must be calibrated. The flat sensors are calibrated inside subunits (submodules) of the calorimeter (in-situ calibration) with the help of multiple reference temperature sensors and a climate chamber which approaches different temperature plateaus. At the temperature plateaus, calibration points are taken to calibrate the flat sensors with an accuracy of 0.14 ^∘C .