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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.52: Poster

Dienstag, 28. März 2017, 16:45–18:45, F Foyer

Track-based Misalignment Corrections for the CBM Silicon Tracking Detector — •Susovan Das for the CBM collaboration — Physikalisches Institut, Eberhard karls Universität Tübingen

The Silicon Tracking System (STS) is the central tracking detector of the CBM experiment. It consists of 8 layers of altogether ∼900 double-sided silicon strip sensors. The sensors have a strip pitch of 58µm yielding an intrinsic resolution of ∼20µm. On the other hand, we expect a mechanical precision of the STS assembly not better than ∼100µm. Therefore, the intrinsic resolution has to be recovered by software based alignment methods. The software correction is based on the MILLEPEDE package.

In this contribution we present different misalignment scenarios which reflect the hierarchy of the mechanical assembly of the STS, i.e., stations, units, ladders, sensors. We evaluate the effect of the misalignment of the various components onto the tracking efficiency and momentum resolution of the detector by simulations using UrQMD events.

In a further step we explore how well, and within which limits, the track-based MILLEPEDE algorithms are able to recover the ideal resolution of an undistorted detector.

• This work was supported by grant BMBF-05P16VTFC1