SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Heavy-Ion Collisions and QCD Phases I

HK 2.6: Talk

Monday, August 30, 2021, 18:00–18:15, H1

Spadic response to single photon ionization based signals — •Marius Kunold for the CBM collaboration — Goethe-Universität Frankfurt am Main, Deutschland

The aim of the Compressed Baryonic Matter experiment at the Facility for Antiproton and Ion Research is to explore the QCD phase diagram in the region of high net-baryon densities. The Transition Radiation Detector is designed to identify light nuclei and deliver information for the global track reconstruction. Therefore, 4 layers of multi-wire proportional chambers with a segmented cathode readout will be installed. The signals will be readout by the Self-triggered Pulse Amplification and Digitization ASIC (SPADIC). For a successful particle identification a precise knowledge of the originally deposited energy and the position and time of the traversing particle is mandatory. Therefore, it is of high importance to have a detailed knowledge about the response of the SPADIC to the signals on the cathode plane.

The poster presents an analysis of the SPADIC response to single photons from a ⁵⁵Fe source. Especially the theoretical expectations are compared to the measured signal-shapes. The investigation is an initial step towards more elaborate time and charge reconstruction methods. To extract the charge and absolute time of the single signals a fit of the ADC sample distribution, based on the theoretical response function together with effective parameters, is performed. This new method is compared to the old charge extraction by reproducing an iron-spectrum.