[Halld-pid] Start Counter Meeting Minutes, December 12, 2013

[Mark Ito]

Flipped over the page in my notebook and discovered I missed a whole 
segment of the meeting. Here it is:


    Calibration

Sean introduced the effort he has been leading to define the calibration 
constants sets that we will need, detector system-by-detector system. 
Today was the start counter's turn.

Werner went through the list.

  * time walk corrections
  * effective speed of light
  * parameters for attenuation corrections
  * gain constants
  * time resolution
  * time offsets

He will write down a specific set of constants for us to start with.


On 12/14/2013 09:53 PM, Mark Ito wrote:
> Dear PID list,
>
> Find the minutes below and at
>
> https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_12,_2013#Minutes
> .
>
>     -- Mark
> ______________________________________________________
>
> GlueX Start Counter Meeting, December 12, 2013
> Minutes
>
>      Present:
>        * FIU: Werner Boeglin, Eric Pooser
>        * JLab: Chuck Hutton, Mark Ito (chair), Beni Zihlmann
>
> Counter Construction Status
>
>      Eric gave the report.
>        * Eljen has been having yield problems due to scratches on the bent
>          scintillator bars. The Q/A guy there has taken over production and
>          since then, yield has improved. They have 25 bars of acceptable
>          quality and should have all 50 by Christmas.
>        * McNeal has been apprised of the delay. They think that their
>          estimate of 4 weeks to do the work should hold.
>        * FIU has decided on food grade aluminum to do the wrapping of the
>          counters. The thickness is 16.5 µm.
>        * Anthony (FIU student) has done several test wraps with good results
>          on the barrel and nose sections. The technique on the dreaded bend
>          region is the next hurdle.
>        * The design of the assembly jig is largely done. The next step is to
>          start ordering materials and running the design past the machine
>          shop.
>        * The exact mechanism for precise clocking of the inner mandrill
>          still needs to be worked out.
>
> Support Structure Construction Status
>
>      Chuck brought in the latest inner carbon fiber tube for show and tell.
>      The length of the tube has been extended from the original plan to 12
>      inches. This still will not cover the nose region. We discussed whether
>      three layers of carbon fiber was acceptable. Although a bit more
>      material will be added than we expected, we thought that we could live
>      with it.
>
>      [Added in press: Eugene Chudakov points out that we might want to look
>      at the effect of the extra material on proton detection efficiency.]
>
>      Retrieved from
> "https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_12,_2013"
>

-- 
Mark M. Ito, Jefferson Lab, (757)269-5295

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