Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 35: Halbleiter: F&E 2

T 35.2: Vortrag

Montag, 9. März 2015, 17:05–17:20, K.12.16 (K4)

Spectroscopic measurements with the ATLAS FE-I4 pixel readout chip — •David-Leon Pohl, Jens Janssen, Tomasz Hemperek, Fabian Hügging, and Norbert Wermes — Physikalisches Institut der Univeristät Bonn

The ATLAS FE-I4 pixel readout chip is a large (2x2 cm²) state of the art ASIC used in high energy physics experiments as well as for research and development purposes. While the FE-I4 is optimized for high hit rates it provides very limited charge resolution. Therefore two methods were developed to obtain high resolution single pixel charge spectra with the ATLAS FE-I4. The first method relies on the ability to change the detection threshold in small steps while counting hits from a particle source and has a resolution limited by electronic noise only. The other method uses a FPGA based time-to-digital-converter to digitize the analog charge signal with high precision. The feasibility, performance and challenges of these methods are discussed. First results of sensor characterizations from radioactive sources and test beams with the ATLAS FE-I4 in view of the charge collection efficiency after irradiation are presented.