Π polarizability Meeting Nov 14, 2013

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Meeting Info.

Meeting Time And Location

2:00pm EST (JLab time)

CEBAF Center F226 (definitely)

Connecting

We will use ReadyTalk phone conferencing. Here are the instructions:

  1. dial the appropriate number
    • +1-866-740-1260 : US and Canada
    • 0800-6645316 : Germany
    • A complete list of toll-free international numbers can be found here.
  2. Enter the participant code: 3421244# (the # is needed when using the phone)


If there is a problem connecting via ReadyTalk, we'll use Skype as a backup. The relevant Skype user names are:

  • Rory Miskimen - rmiskimen
  • Alexander Mushkarenkov - alexander_mushkarenkov
  • Elton Smith - eltonssmith
  • David Lawrence - aehsdad

some phone numbers if needed:

David: (757) 269-5567 (cell: 757-746-6697) Rory: (413) 545-2480

Agenda

  1. Previous meeting: Oct 31, 2013
  2. Announcements
  3. GARFIELD calculations (Sean M.)
  4. AOT


Minutes

Attendees: Rory M., Sean M., Ali, Megan, Elton S., Mark I., David L.

Next meeting

We'll meet next on Dec. 5th (skip Thanksgiving)

Prioritization PAC

  • Elton thinks they are scheduling it in May (before regular PAC)
  • Want a second workshop in April
    • first workshop was theory focussed
    • second workshop should focus on experimental aspects (beam line, software, detectors, ...)
  • Prioritization PAC may look closely at readiness
  • they will be trying to decide which experiments to run (they won't try changing scientific ratings)


Spring APS meeting

  • Invited session approved for hadron polarizabilities (Volker Crede)
  • Rory is considering several options for speakers given the constraints of APS rules


GARFIELD Simulations

  • Simulations were done using 90%/10% Ar/CO2
  • Field calculated assuming 10^5 gain using parameterization from Mac
    • voltage on sense wire was ~1875V
  • Original geometry had 1cm half-gap (1cm between sense wire and field wire)
  • Maximum drift time (corresponding to 0.95cm from sense wire) was ~1μs
  • Also looked at 5mm half-gap and 7.5mm half-gap
  • For 5mm half-gap, maximum drift time was close to 500ns
  • Currently investigating gas mixture 80/20 (some issues with GARFIELD crashing)
  • Need to investigate what kind of spatial resolution we need to separate πs and μs

JLab experiment HPS

  • Also need to separate πs and μs
  • Looking for e+e- and μ+μ- vertices
  • They are considering layers of iron and scintillator
    • wave-shifting readout (fibers to multi-channel PMT)
    • currently unfunded (MRI proposal written)
  • Rory will communicate with some of the folks involved to find out where they are at and what they are thinking

Next Meeting

  • How big do the detectors need to be?
    • 2mx2m ?
    • smaller is more convenient for restricted space
  • How many layers?


Misc

  • David will send Megan ROOT file with generated events