Difference between revisions of "Π polarizability Meeting Apr 15, 2020"

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Attendees: Albert F., Andrew S., Elton S., Iliya L., Mark I., Rory M., Nick B., Vambow
 
Attendees: Albert F., Andrew S., Elton S., Iliya L., Mark I., Rory M., Nick B., Vambow
  
==== Engineering ====
+
'''Engineering'''
 
* Tim sent e-mail a few days ago asking about alignment requirements of absorbers and chambers  
 
* Tim sent e-mail a few days ago asking about alignment requirements of absorbers and chambers  
 
** is +/-4mm good enough
 
** is +/-4mm good enough
Line 69: Line 69:
 
* Rory will respond to Tim's e-mail and ask if we can schedule a meeting next week to discuss it
 
* Rory will respond to Tim's e-mail and ask if we can schedule a meeting next week to discuss it
  
==== e+e- Simulation ====
+
'''e+e- Simulation'''
 
* Andrew has made some progress in calculating the acceptance of e+e- events as a function of invariant mass.  
 
* Andrew has made some progress in calculating the acceptance of e+e- events as a function of invariant mass.  
 
** expanded cut on &theta; to be >0.75<sup>o</sup> as opposed to previous cut of >0.1<sup>o</sup>
 
** expanded cut on &theta; to be >0.75<sup>o</sup> as opposed to previous cut of >0.1<sup>o</sup>
Line 76: Line 76:
 
* Some work has started on MVA
 
* Some work has started on MVA
  
==== Jeopardy ====
+
'''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).
 
* 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
 
* 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.
 
* Rory will set up LateX document with outline so we can start working on it.

Latest revision as of 11:40, 15 April 2020

Meeting Info.

Meeting Time And Location

9:00 EST (JLab time)

CC L207

Connecting

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  1. Previous meeting: Apr 8, 2020
  2. Announcements
  3. Update on Engineering/Design
    1. April 2, 2020 CPP Design Meeting
    2. Screen Shots of Mechanical Design Apr 2
  4. Data Analysis - Andrew
  5. BH sensitivity to form factors (Rory)
  6. Preparations for Jeopardy
  7. Other business
  8. Next meeting


Minutes

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.