Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Trigger 1

T 62.9: Talk

Wednesday, March 11, 2015, 18:45–19:00, G.10.06 (HS 6)

The Region-of-Interest Distribution of the Online Selection Nodes (ONSEN) — •Dennis Getzkow, Thomas Geßler, Leonard Koch, Wolfgang Kühn, Sören Lange, Klemens Lautenbach, David Münchow, and Björn Spruck — Justus-Liebig-Universität Gießen, II. Physikalisches Institut

The new pixel detector (PXD) of the Belle II experiment is based on DEPFET technology. It has an estimated maximum occupancy of 3% which causes a output data rate of more than 20 GB/s. Before storage, the data is reduced using regions-of-interest (ROIs) calculated by two independent algorithms. The ROIs are defined by extrapolating tracks from the outer tracking detectors to the PXD. The buffering of the PXD data during ROI calculation and the data reduction are performed by the Online Selection Nodes (ONSEN) system that consists of 32 FPGA ``Selector'' modules. Each Selector processes data for a particular PXD section and event number. A FPGA ``Merger'' module processes the incoming ROIs, distributes and sends them to the corresponding Selector Nodes.

Test results from a laboratory setup with up to seven FPGA boards will be presented. PXD data and ROIs were emulated, processed by the test system and compared to expected outputs. These tests were used to verify the ROI distribution and the pixel reduction mechanism.

This work was supported by the Bundesministerium für Bildung und Forschung under grant number 05H12RG8.