[Halld-jlab] Hall D Staff Meeting Notes, April 9, 2012

[Mark M. Ito]

Hall D'ers,

Find the notes at 
https://halldweb1.jlab.org/wiki/index.php/Private:Hall_D_Staff_Meeting,_April_9,_2012 
and below.

   -- Mark
   _____

Private:Hall D Staff Meeting, April 9, 2012

    Present: Eugene Chudakov (chair), Kwame' Coles, Hovanes Egiyan, Mark
    Ito, Vanik Kakoyan, David Lawrence, Lubomir Pentchev, Simon Taylor, Tim
    Whitlatch, Elliott Wolin, Glenn Young, Beni Zihlmann

Installation, Tim

      * installation schedule made with an eye toward the accelerator
        schedule
           + Tom Carstens has a detailed schedule
           + Eugene with post schedule on Hall D page
      * pair spectrometer magnet pole pieces in, there was a fit problem,
        fixed
      * tagger magnet: by this week company should be winding coils
      * downstream platform awarded for about half of expected price
      * cryogenic platform: facilities is reviewing design
      * tagger vacuum chamber: materials ordered
      * beamline components: finalization underway with Sascha
           + Tom has a list of things to order
           + some pair converter details yet to be decided
      * tooling for BCAL: half way welded up, should be done by end of
        month
      * stands for tagger magnet: PR issued
      * shims installed in magnet, between yokes
      * baffle supports: design done, tooling done
      * design for BCAL rails near final
      * electrical work in counting house: UPS to be installed today or
        tomorrow
      * there is backup plan to put plugs into counter-sunk bolt holes in
        pair spectrometer magnet if they affect the field
      * breakthrough from accelerator tunnel to Hall D beamline will be
        done during 16-month shutdown
      * sag in photon beamline is still there will be forever; should not
        be a problem
      * tagger power supply becomes available in May
           + Giles talking to Bill Merz about spare parts, etc.
           + 480 V available in service building to plug it in
      * Radiated noise concern from Fernando:
           + as for UPS requirements in Hall, need to create a list
           + some class A devices, e. g., network switches
      * Giles can sign control circuit diagrams, he will let us know if he
        is not comfortable with any such assignments

Flash 125, Cody

      * a prototype flash 125 came in last week
           + boards for main and mezzanine
           + some parts need to be replaced, resistors
           + should be assembled in next couple of days
           + will be programmed and tested
           + Beni would like to get one
           + want to test pulser out
           + test vectors need to be written
      * working with Procurement on main order

FDC Construction, Lubomir

      * assembled first refurbished cell on Thu., started flushing with gas
      * oxygen level drops over days, one cell per week, leveled out at 900
        PPM
      * looks like May to finish the package, unless test rate increased
      * the testing chamber, got to 300 PPM, 3 O-rings
      * expect higher level with 5 O-rings
      * getting leakage, garden variety, tighten, dropped to 570 PPM
      * harder O-rings susceptible to leakage compared to old ones
      * leakage similar to what was seen in prototype

Software Review Preparations, David

      * Friday meetings continue
      * chair for review committee identified, not announced
      * organizers are working on the schedule
      * charge has not been circulated
      * meeting tomorrow on preparations for review
           + slides prepared on areas of concern
      * research management document: not clear if that is relevant
      * talk outlines are due in two weeks
      * first dry run May 14 or 15
      * review will be June 7 and 8
      * activity list coming along, some feedback coming in

BCAL Test, Eugene

      * mini-BCAL has been connected, in the beam, signals were captured
      * heat issue
           + from electronics to SiPM plate
           + heats up by 5 degrees C when electronics turned on
           + perhaps insulation between plates not enough
           + heat path not yet understood
      * range of signals with electrons measured
           + first impression: signals too big
           + with 1 GeV electrons, some channels go to 1/2 of full range
      * some electronics issues, oscillations

    Retrieved from
    
"https://halldweb1.jlab.org/wiki/index.php/Private:Hall_D_Staff_Meeting,_April_9,_2012"


-- 
Mark M. Ito
Jefferson Lab (www.jlab.org)
(757)269-5295