Karlsruhe 2011 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 72: Detektorsysteme II

T 72.1: Gruppenbericht

Donnerstag, 31. März 2011, 16:45–17:05, 30.36: 011

The Belle II PXD Data Aquisition and Reduction System — •Björn Spruck, Thomas Geßler, Wolfgang Kühn, Jens Sören Lange, Ming Liu, and David Münchow — II. Physikalisches Institut, Universität Gießen

The Belle II detector will be located at the asymmetric Super-KEKB facility and is planned to start operation in 2014. For the reconstruction of B decay vertices, silicon strip and DEPFET pixel detectors close to the beam will be used. The readout and storage of the pixel data is a challenge due to the high background rate in these detectors. The expected data rate of 180 GBit/s from the pixel detectors is too large to be handled directly by the event builder. Thus, a reduction of the data by a factor ≃10 is required. A hardware platform capable of processing this amount of data is the ATCA based Compute Node developed in close cooperation between IHEP Beijing and our institute. Each Node consists of five Virtex4fx60 FPGAs and is equipped with a total of 10 GB memory, 6× GBit ethernet and 8 optical links which allow for high data transfer rate. One ATCA crate can house 14 of these boards, each interconnected by RocketIO on a full mesh backplane.

This talk will not only focus on the current hardware and future developments, but also on the setup and performance of a test system, including the data reduction algorithms. The possibility for calculating the regions-of-interest in the pixel data directly from the silicon strip data on the Compute Node will be discussed in addition.

This work is supported by BMBF under grant 05H10RG8.