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Add VeloMicroBiasLine for VELO closure (prefiltered on VeloOpen event type)

Saverio Mariani requested to merge samarian_veloclosureline into master

Description and discussion in https://gitlab.cern.ch/lhcb/opg/-/work_items/64

This MR contains:

  • an event filter requiring the VeloOpen ODIN EventType bit (please note that in 2023 this was turned on with the VELO closed, which has now been reverted by @falessio and @rmatev to match the VeloOpen definition)
  • the VeloMicroBias line prefiltered with the algorithm above is added to the default sequence

The sequence has been tested on 2023 Run 276756, with VELO closed, and on Run 263368, with VELO open. The filter is fully efficient for the former, while accepts zero events in the latter (the opposite is expected, see the comment above).

I set the VeloClosing prescale to 0.03 (which lowers the rate by the nominal 30MHz to about 900 kHz, as the VeloMicroBias trigger accepts the 99.9% of the events, as from the exp 2024 MC).

closes https://gitlab.cern.ch/lhcb/opg/-/work_items/64

Edited by Saverio Mariani

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