[Halld-cpp] CPP Meeting Minutes, January 5, 2022

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/%CE%A0_polarizability_Meeting_Jan_5,_2022#Minutes> 
and below.

   -- Mark

      ____________________________________


    Π polarizability Meeting Jan 5, 2022, Minutes

Present: Mark Ito (chair), David Lawrence, Rory Miskimen, Andrew Schick, 
Simon Taylor

Given that we were missing several key players, we decided to defer 
substantive reports, in particular a report on the chamber work at JLab, 
until the next meeting. We only dealt with issues/news that were in 
fronts-of-mind for the participants.


      Trigger Test Data

Rory mentioned news from Ilya Larin about trigger test data taken at the 
end of the SRC run. Data were taken in raw mode, with a random trigger, 
and there is thought to be enough of it to do a meaningful study.


      CPP-Enabled Software Version Set

Elton Smith promised Andrew a version set with all the components in 
place to do CPP simulation and data analysis in early January. Simon 
described the issues with two packages.

 1. Before the break, there was a pending pull request
    <https://github.com/JeffersonLab/HDGeant4/pull/200> from Simon for
    *HDGeant4*. Over the break, Richard Jones merged the changes onto
    the master and we are now ready to tag it and built it.
 2. Changes specific to CPP reconstruction still remain on a branch of
    *halld_recon*. Most of them deal with the MWPCs and can be put on
    the master branch since for non-CPP running, there the chambers are
    not in the geometry, they will be ignored. The exception is the
    creation of FCAL "clusters" from single hits that have been matched
    to a charged track. These will create data in the REST file, though
    in separate element from other FCAL clusters. Mark and Simon will
    discuss strategies for merging this code.


      Call-Backs in ROOT

Andrew asked for guidance in passing non-function-argument parameters to 
a call-back function used by Minuit in the context of ROOT. Global 
variables were suggested by collaborator(s) who would only comment if 
their identities were protected. Andrew and Mark will meet after the 
meeting to discuss this further.


      News from Ebode

David reports that Ebode Onyie has enrolled in a Cypriot university and 
is working with a professor there. He hopes to continue his research 
work on CPP from his new institution. He will be making a presentation 
there on CPP soon. He will send some slides to David for comment in 
advance of the talk.

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