Π polarizability Meeting Apr 15, 2020

From GlueXWiki
Revision as of 10:40, 15 April 2020 by Davidl (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Meeting Info.

Meeting Time And Location

9:00 EST (JLab time)

CC L207

Connecting

You can connect using BlueJeans Video conferencing (ID: 949 429 419). (Click "Expand" to the right for details -->):

  1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:

  2. Meeting ID: 949 429 419
    • (you may need to type this in, depending how you connect)

  3. If connecting via Web Browser: click this link (no passcode is needed):

  4. If connecting via iOS or Android App:
    • Use your JLab e-mail address to log in and then enter the meeting ID given above to join the meeting

  5. If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"

  6. If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above



  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.