Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Instrumentation und Anwendungen

HK 53.4: Talk

Thursday, March 15, 2007, 17:45–18:00, F

Online Hough-Tracker for the Silicon Tracking System of the CBM experiment — •Christian Steinle, Andreas Kugel, Reinhard Männer, Holger Singpiel und Andreas Wurz für die CBM Kollaboration — Lehrstuhl Informatik V, Universität Mannheim, Deutschland

The planned CBM fixed-target experiment produces up to 10^7 nucleus-nucleus collisions per second, with multiplicities up to 1000 particles. This is the reason why we need a fast level-1 trigger.

We present an adaptation of the Hough transform for the tracking of particles in the CBM STS detector, together with a possible implementation of the algorithm in hardware using FPGA (field programmable gate array) as a fast level-1 trigger. In a first step we have used a track model based on an analytic formula for the Hough transform. By simulating this concept with central Au+Au data we have achieved reconstruction efficiencies of up to 90% with different geometries for the CBM STS detector. By using the Runge-Kutta method for the transformation we can improve the track model, especially in the representation of the inhomogeneous magnetic field, which will lead to a gain in the efficiency.

The processing time using FPGA processors is in the order of 10 to 100 μs, and is independent of the used track model.

Supported by EU-FP6 HADRONPHYSICS