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T: Fachverband Teilchenphysik

T 66: Halbleiterdetektoren: Strahlenhärte und neue Materialien

T 66.3: Vortrag

Donnerstag, 1. März 2012, 17:15–17:30, ZHG 001

Investigations of the Radiation Hardness of DEPFET Sensors and the BEAST II Experiment at Belle II — •Tobias Kleinohl, Carlos Marinas, Florian Lütticke, and Norbert Wermes — Physikalisches Institut, Universität Bonn, Deutschland

An upgrade of the existing Japanese flavour factory (KEK, Tsukuba) is foreseen by 2014. The new machine (SuperKEKB) will deliver an instantaneous luminosity 40 times higher than the current machine. To exploit the huge number of events that are expected, the detector (Belle) has to be also updated. To make the high precision measurements needed for the reconstruction of the B meson decay vertices in such a harsh environment, the innermost subdetector of the new experiment, Belle II, will equipped with highly pixelated DEPFET sensors. With the increased luminosity, not only higher number of physics events will be created, but also much larger background levels are expected. Under these conditions, with expected doses of up to 1 Mrad (10 kGy) per year, the radiation damage of the DEPFET sensors is an issue that has to be deeply investigated. In addition, a safe environment has to be ensured before the installation of the DEPFET vertex detector. In order to study the conditions of the surrounding volume close to the beam pipe under different configurations of the accelerator, a detector able to measure doses and background sources (BEAST II) will be operated before the final Belle II experiment, until a stable beam configuration is found. In this talk, the performance of DEPFET sensors irradiated with different dose levels and the detector concepts for the BEAST II experiment will be presented.