[Primexd] Random trigger skims

[Igal Jaegle]

Thank you, Alex, that is really helpful.

Peter, please let me know how I should generate the map for the PrimEx data set.

tks ig.
________________________________
From: Alexander Austregesilo <aaustreg at jlab.org>
Sent: Thursday, January 21, 2021 5:25 PM
To: Igal Jaegle <ijaegle at jlab.org>
Cc: primexd at jlab.org <primexd at jlab.org>; Peter Pauli (PGR) <p.pauli.1 at research.gla.ac.uk>
Subject: Random trigger skims

Hi Igal,

We have a plugin called randomtrigger_skim to filter out the random
triggers from any evio input and convert them into the hddm format that
can be mixed into the simulation by mcsmear. To be more realistic, we
only accept random triggers that fall into a time period were the beam
was actually on. The plugin takes this beam fiducial map into account,
but it has to be generated beforehand. Peter Pauli (cc) was just working
on an improved scheme for this extraction, maybe he can help you also
for the PrimEx data.

Once the fiducial map is ready, you just have to run the plugin over all
evio files. Afterwards, we can concatenate the hddm skims from
individual evio files so that we have one file per run.

Before you have the fiducial map, you can also include the option
`RANDSKIM:USEBEAM 0` into your config file to simply write out all
random triggers. This serves already as a good approximation.

Let me know if you have any questions,

Alex

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