[Halld-pid] Start Counter Meeting Minutes, April 4, 2013

[Mark M. Ito]

Correction:

The insured value for the package of 5 bars is about 4 k$ (not the total 
cost).

On 04/04/2013 03:33 PM, Mark M. Ito wrote:
> Find the minutes below and at
> https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_April_4,_2013#Minutes
> .
>     _____
>
> GlueX Start Counter Meeting, April 4, 2013
> Minutes
>
>      Present:
>        * FIU: Werner Boeglin, Eric Pooser
>        * JLab: Mark Ito (chair), Beni Zihmann
>
> Announcements
>
>      Mark talked to Youri Sharabian about how he bent the scintillator for
>      the CLAS start counter. Turns out he had Eljen do all of the shaping of
>      the bars, both bending and milling of the edges. His contact at Eljen:
>      Chuck Hurlbut.
>
> Construction News
>
> Scintillator Manufacturing
>
>      Eric reported that Eljen has finished manufacturing five counters with
>      a precision bend. Chuck Hurlbut explained the procedure:
>        * Clamps of polished aluminum are used.
>        * Scintillator is heated 2 inches beyond bend region.
>        * The clamp is heated as well.
>        * The system allowed to cool, enough to handle.
>        * The scintillator bar is turned on its side and placed on a surface
>          with a drawn line that indicates the proper shape and then allowed
>          to cool for 24 hours.
>        * If the bar does not hold its shape, heating and clamping is
>          repeated.
>
>      Eljen has internal discussions on packaging the bars for shipment. They
>      will apply a clear light-tack adhesive film to all of the counters. The
>      idea is to leave this film on the broad surfaces while the edges are
>      machined at McNeal.
>
>      Eric is waiting to see if McNeal has received the bars. In the
>      meantime, he has been discussing minor details on the contract with
>      them including packaging and handling procedures. The total cost for
>      the complete detector should be about 4 k$.
>
> Test Stand
>
>      Eric walked us through [21]drawings of the stand designed for
>      acceptance testing of incoming scintillator bars. There is a fixture
>      with a Sr source and trigger scintillator that can be moved to
>      reproducible positions along the scintillator under test. There is also
>      an [22]XYZ motion stage to hold the SiPM detectors. The entire
>      structure will be inside a dark box.
>
>      Eric would like to have the stand constructed and working before the
>      five bars arrive from McNeal. Machining will be done in the FIU shop by
>      Carlos Ortega.
>
> Contract
>
>      Ludmilla Ettiene sent the technical proposal to JLab Procurement. The
>      terms and conditions are still being worked on at FIU. Sponsored
>      Research has received comments from Legal, but nothing major. Werner
>      has been asked to respond to a few questions. JLab should recieve the
>      complete package by next week sometime.
>
>      Retrieved from
> "https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_April_4,_2013"
>
> References
>
>     21. https://halldweb1.jlab.org/talks/2013-2Q/Test_stand.pdf
>     22.
> https://halldweb1.jlab.org/talks/2013-2Q/Newport_XYZ_Translation_Stage.JPG
>


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