Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Instrumentation

HK 4.2: Vortrag

Montag, 19. März 2012, 14:30–14:45, P 2

Development of radiation hard silicon microstrip detectors for the CBM experiment — •Minni Singla — Goethe University, Frankfurt, Germany

We aim to develop low noise radiation hard Double Sided silicon Strip Detectors (DSSDs) for the CBM Silicon Tracking System (STS). The neutron fluence is expected to reach 1×10¹⁴ n_eqcm⁻² for some of the STS stations which puts us in the regime of LHC, high energy physics experiments. However our task is much more challenging since we use DSSDs, hence both detectors sides should be operating at such high fluences. In order to investigate the life time of DSSDs, it is imperative to extract charge collection efficiency (CCE) as a function of fluence for which one has to understand strip isolation in particular on the ohmic side. Hence we are exploring various isolation techniques, for example P-stop, P-Spray, Combined P-stop/P-spray (conventional techniques) and also a new isolation technique (Schottky barrier). Four detector designs having these isolation techniques have been fabricated at CiS, Erfurt and are being studied at GSI after neutron irradiation. Some interesting static and dynamic measurements have been done within our group to compare the isolation provided by Schottky barrier and conventional isolation techniques. A simulation model has also been developed which is able to reproduce the experimental observations. We plan to test these DSSDs in beam and to compare these isoltaion techniques in terms of CCE. Supported by EU-FP7 HadronPhysics3, HiC for FAIR and HGS-HIRe for FAIR.