[Halld-pid] Time-of-Flight Meeting Minutes, February 14, 2013

[Mark M. Ito]

Forgot to mention that:

Fifty-five light guides have been done, machined and polished. A change 
in the procedure now has the machine shop sand the ends with 400 grit 
paper to prepare the surfaces for gluing. Previously this was done in 
the lab.

On 02/14/2013 01:37 PM, Mark M. Ito wrote:
> Find the minutes at
> https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_February_14,_2013#Minutes
> and below.
>     __
>
> GlueX TOF Meeting, February 14, 2013
> Minutes
>
>      Present:
>        * FSU: Paul Eugenio, Sasha Ostrovidov
>        * JLab: Chuck Hutton, Mark Ito (chair), Tim Whitlatch, Beni Zihlmann
>
> Mini-TOF Status
>
>      There was a minor problem with the construction drawings for the frame
>      at FSU: they assumed counters 255 cm long (an old dimension) when the
>      actual dimension is 254. This was easily remedied by slotting the
>      attachments holes for the appropriate frame parts. The drawings at
>      JLab.
>
>      There was a slight interference with the clamps and the curved part of
>      the light guide. FSU simply trimmed an edge of the the clamp to
>      proceed. This change also needs to be fed back into the drawings at
>      JLab.
>
>      Since the end of the scintillators, while being glued, are almost 10
>      feet above the floor, there is a scaffolding being built next to the
>      gluing fixture to allow access for work. Some additional design effort
>      is going into personal safety while mounting the scaffold as well as
>      general mechanical stability.
>
>      An old scintillator bar, from previous prototypes, has been cut up to
>      serve as blanks for the two additional half-length counters needed to
>      complete the mechanical assembly, opposite the actual first-article
>      modules. They will be wrapped. A decision on whether to instrument them
>      has not been made.
>
> Construction Status
>
>      Four modules are glued and ready for wrapping. More will be glued
>      today. Wrapping will start tomorrow.
>
>      Maurizio Bertoli, the construction manager for this project, has
>      started work at FSU.
>
> PMT Testing
>
>      All 194 PMTs have have gone through gain testing. All are good. There
>      are few that Sasha would like to re-measure so the latest standard
>      procedure can be applied to them.
>
> Scintillator Testing
>
>      Sasha reported that the results presented last time had a labeling
>      error, and that the modules with the reduced attenuation length were
>      the two half-length modules, contrary to expectations. The issue is
>      being investigated. Beni agreed to consult on this matter.
>
> Readiness Review
>
>      The readiness review is scheduled for Friday, March 8. Beni, Chuck, and
>      Bruce Lenzer will be traveling to FSU.
>
> Contract
>
>      Paul and Mark have been discussing the system for invoicing and
>      progress reporting now that contract work had started. The procedure
>      needs to be systematized a bit.
>
>      Retrieved from
> "https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_February_14,_2013"
>


-- 
Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295