Π polarizability Meeting July 1, 2016

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Meeting Info.

Meeting Time And Location

10:30 EST (JLab time)

CC A110

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Agenda

  1. Previous meeting: Jun. 7, 2016
  2. Announcements
  3. FCAL Platform
  4. MWPC Transport Cart (Andrew, Matt)
  5. MWPC Construction(Rory)
  6. π+π- simulation (Elton)
  7. CPPsim (David)
  8. Next meeting

Minutes

Attendees: Rory M. (chair), David L., Elton S., Andrew S., Mark D., Ilia L., Serguei G.

Announcements

  • Chambers accidentally set 500V too high in lab. No obvious damage but brief procedure review will be done.
  • Ilia (in attendance) will officially start with UMass on Aug. 25th (delayed due to visa issues)
  • Bobby attended G4 workshop last week at MIT. Will be going to JLab in a couple of weeks and will work on simulation.

Carts

  • Initial design for cart to hold and transport MWPC was shown.
  • These are needed because the carts weigh a lot (couple of hundred pounds each) and have fragile electronics or gas couplings on every side and so must be held a couple of inches off the ground.
  • Considering using these for transport to JLab as well since a similar structure will be needed.

MWPC construction

  • HV boards have been attached to frame of full scale prototype
  • Al plate gouges smoothed out to make surface smooth to the touch
  • Machinist currently cutting grooves into G10. Some delays after first piece.
  • Elton: FDC had to paint epoxy in grooves to prevent gas leaks
    • Rory spoke with Lubomir about that and had an understanding of technique. Will first attempt to polish grooves to see if that will suffice.
  • Wire Stringing:
    • Using long threaded rod with thread pitch that is multiple of 1/10"
    • Typical threaded rod has poor accuracy over long lengths
    • More accurate to cut than to extrude (most are extruded)
    • Rod bows some under its own weight. Possible to prevent with a brace in the center
    • Looking for manufacturer willing to produce only a 1 or 2 rods

π+π- simulation

  • Elton simulated events produced by Justin's ρ -> π+π- generator
  • Generator required AmpTools package
  • Configuration files documented in e-log entry (linked in agenda above)
  • Currently configured for proton target with Coherent photon peak at 9GeV. Will update for future studies

CPPsim

  • David showed comparison of CPPsim (GEANT 4) output with the hdgeant (GEANT 3) simulation
  • Reasonable agreement for TOF and FCAL
    • Some fine structure doesn't match, but broad structure does
  • FMWPC absorber needs to be verified (only present in CPPsim)

Next Meeting

The next meeting is scheduled for Fri. July 15th at 9:30 am JLab time