[Halld-cpp] CPP Meeting minutes

[David Lawrence]

Hi All,

  I’ve posted some minutes from the meeting this morning (up to the point I left). Others may feel free to modify and add to.

https://halldweb.jlab.org/wiki/index.php/%CE%A0_polarizability_Meeting_Apr_15,_2020<https://halldweb.jlab.org/wiki/index.php/Π_polarizability_Meeting_Apr_15,_2020>


Minutes[edit<https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_Apr_15,_2020&action=edit&section=4>]
Attendees: Albert F., Andrew S., Elton S., Iliya L., Mark I., Rory M., Nick B., Vambow
Engineering

  *   Tim sent e-mail a few days ago asking about alignment requirements of absorbers and chambers
     *   is +/-4mm good enough
     *   what about reproducibility if platform must be moved
  *   General consensus was that 4mm will not be accurate enough given the size of the beam spot and holes.
  *   Some top-of-the-head estimates that we'll need at least +/-2mm and possibly even better
  *   Elton noted that +/-1mm will probably be pretty difficult but we'll need to discuss it with Tim
  *   Iliya suggested a different spec. for the upstream Pb absorber than other components may be an option since that will be stopping most of the low energy beam halo
  *   Rory will respond to Tim's e-mail and ask if we can schedule a meeting next week to discuss it

e+e- Simulation

  *   Andrew has made some progress in calculating the acceptance of e+e- events as a function of invariant mass.
     *   expanded cut on θ to be >0.75o as opposed to previous cut of >0.1o
     *   acceptance peak dropped to below 1.0 (previously it had been >3)
     *   discussed the possibility of floating point round off errors, but unable to clearly identify that as source.
  *   Some work has started on MVA

Jeopardy

  *   Suggested schedule from Bob M. was to keep new proposals due June 1st (no change) and give Jeopardy proposals an extra 2 weeks (June 15th).
  *   Schedule not finalized yet and will depend on negotiations between PAC members and lab management
  *   Rory will set up LateX document with outline so we can start working on it.




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