Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation II

HK 8.1: Gruppenbericht

Montag, 14. März 2016, 14:00–14:30, S1/01 A3

Fast and Convenient Data Analysis Software at the BGO–OD Experiment — •Oliver Freyermuth for the BGO-OD collaboration — Physikalisches Institut, Universität Bonn

The BGO–OD experiment located at the ELSA accelerator in Bonn is using the electron beam with energies up to 3.2 GeV for the investigation of meson photoproduction off the nucleon. The setup combines a central highly segmented BGO crystal calorimeter with a forward magnetic spectrometer complemented by ToF walls. In total over 5000 channels of diverse detectors are connected to the readout system.

The data analysis for this complex setup is handled by a modular software derived from the ROOT-based analysis framework ExPlORA, originally developed by the CB-ELSA/TAPS collaboration in Bonn.

This framework has now been heavily extended with a set of generic tools which can be used without knowledge of its internal design or extensive programming experience, while achieving the execution speed of compiled code. The underlying concept as well as its performance will be presented.

Secondly, methods of data preprocessing will be discussed. Since the analysis chain is based on object-oriented data structures, it can be easily segmented by storing intermediate preprocessed datasets. A technique to prune lower-level information was developed.

Finally, it will be illustrated that ExPlORA is closely entangled with recent and upcoming developments on C++ and ROOT. On this basis it is equipped with tools assisting in development and testing.

This work is supported by the DFG (SFB/TR-16).