Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 70: Instrumentierung XIV

HK 70.2: Talk

Friday, March 19, 2010, 14:15–14:30, HG ÜR 6

Automatic Run-Configuration of the ALICE High Level Trigger — •Timm Steinbeck — Frankfurt Institute for Advanced Studies, University Frankfurt

The ALICE High Level Trigger (HLT) uses a pipelined and component based approach for data reconstruction and analysis. Processing components push data to the next step in the processing chain via a common interface. Data flow components transport data between nodes and merge different parts of data belonging to the same event. In order for this to work, a configuration for a processing chain has to be created before the start of a run. A repository of XML files is used to automate this, with each file holding the necessary configuration for one component, including its parents components that provide its input data. The ALICE Experiment Control System (ECS) provides a number of configuration parameters to the HLT, including an identifier for the trigger menu with the algorithms to run, a list of participating detectors, and a list of active input DDLs providing data from the detectors to DAQ and HLT. From these parameters an HLT configuration is determined fully automatically including determination of the full parent hierarchy from the top-level trigger and output components to the components receiving the data from the detector, without any manual intervention or configuration.

Work on the ALICE High-Level Trigger has been financed by the German Federal Ministry of Education and Research (BMBF) as part of its program "Förderschwerpunkt Hadronen- und Kernphysik - Großgeräte der physikalischen Grundlagenforschung".