Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 67: Pixeldetektoren 3

T 67.2: Vortrag

Dienstag, 28. März 2017, 17:00–17:15, VSH 116

Characterization of pixel detectors using X-ray fluorescence — •Doreen Achnitz, Fabian Hügging, David-Leon Pohl, Norbert Wermes, and Jochen Dingfelder — Physikalisches Institut der Universität Bonn

The ATLAS FE-I4 pixel readout chip was designed for the ATLAS pixel detector at the Large Hadron Collider (LHC). The pixel detector makes use of the analogue charge information to improve the track and vertex measurement performance. Therefore an absolute charge calibration of each pixel is desired. In general for the characterization and calibration of new pixel detector designs, a known charge deposition in the sensor is needed. In this context, an experimental setup is being built to produce high intensity X-ray spectra of different energies. An X-ray tube is used with different fluorescence targets to generate a variety of characteristic X-ray lines which can be reconstructed by the pixel detector. The intensity allows for sufficient per pixel statistics, in particular needed for small prototypes. The setup has been characterized with a planar 200 μm n-in-n sensor bump bonded to the ATLAS FE-I4 pixel readout chip. In this talk, the method and first results of the X-ray fluorescence spectroscopy measurements are presented. Additionally, further features of the ATLAS FE-I4 like the lowest achievable threshold and the maximal rate capabilities were investigated with the new setup.