Description of the Vetra Project and its Application for the VELO Detector

Vetra is the LHCb data reconstruction project which emulates the performance of the TELL1 readout board processing algorithms. This project is required for monitoring and commissioning the LHCb silicon detectors. A bit-perfect emulation of the TELL1 processing algorithms is performed. This project allows raw data (non-zero suppressed) to be processed to produce the standard zero suppressed cluster data, used by the LHCb reconstruction project Brunel. The Vetra framework is used by the VELO and ST detectors in LHCb. This note provides a general description of Vetra but concentrates on the VELO usage. Vetra is used to monitor the performance of the detector and the data acquisition board algorithms. The parameters that control the data acquisition boards are determined and optimised using Vetra. The project is used widely in the VELO and is used for testbeam and laboratory tests, including production testing for the modules.