Hall C Weekly Meeting - November 19, 2012

• From Roger Carlini
  • Brief summary of QWeak collaboration meeting.
    • Mark Dalton reprised DNP presentation of 25% measurement of QWeak.
    • Presentation from Wally Melnitchouk of updated calculations of gamma-Z box correction (constrained by preliminary Hall A PVDIS data).
    • Lots of analysis talks.
    • The 25% measurement will be published - perhaps Science (?) or PRL.
    • Project spring 2014 for preliminary QWeak results from full statistics.
    • 5th pass "replay" in progress.
    • Next collaboration meeting in March or early April at JLab.

• From Walter Kellner
  • Most of the concrete on the floor is broken up - small section remains. Rubble still on the floor.
  • Need to find appropriate chemical that will bond to the dust so techs can sweep up floor without too much particulate debris flying around.
  • Standards for allowable levels of particulate matter have changed throughout industry, and are being applied at JLab. More testing and planning is necessary when doing work that creates a lot of dust, etc.

• From Joe Beaufait
  • Found that Compton power supply was disconnected, hence the strange test results last week. Re-connected, and everything looks ok on the power supply. So both "large" Danfysik power supplies appear to be ok (the small one was totally submerged in the flood - not salvageable).
  • Work order for powerstrip change-out in hall was canceled - deemed not to be responsibility of FM. Regardless, we need help to get it done. Joe will follow up with Paul Powers.
  • Tubing for nitrogen purge on cables under floor setup.
  • Discussion of Counting House work (question from Brad S.): not much work seems to be going on, completion date of January seems unlikely.
  • Comment from Walter that he put in work request to get control of hall exhaust fans via in-hall switches interlocked to roll-up door.

• From Steve Wood
  • Went to Hall A DVCS collaboration meeting in France.
    • There was a session on Hall C calorimeter facility.
    • Proposed uses:
      • pi0 detector (exclusive and semi-inclusive production)
      • DVCS
      • Wide angle Compton scattering
    • Goal is to make it clear that such a device would be a facility for Hall C that can be used for multiple experiments.
  • Joint Hall A & C Analysis Workshop, December 12, 2012
  • Planning for January Hall C meeting starting. Soliciting talk suggestions. Meeting probably later half of January 2013.