[Halld-pid] Time-of-flight Meeting Minutes, August 29, 2013

[Mark M. Ito]

Folks,

Find the minutes below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_29,_2013#Minutes 
.

   -- Mark
_____________________________

Minutes

Present:

     FSU: Paul Eugenio, Sasha Ostrovidov
     JLab: Eugene Chudakov, Mark Dalton, Chuck Hutton, Mark Ito (chair)


Announcements

     We have dropped the idea of doing a contract extension for the
     machining of support structure parts at FSU. Incidental charges
     will be covered by JLab attributed to the support frame activity
     per original plan.

         Most, if not all, of the drawings for pieces of the support
         structure to be machined at FSU are ready for signature. Chuck
         will send the ones for aluminum collars and the light guide
         holders ("Swiss cheese") pieces to Randall so he can estimate
         raw material needs.

     Maurizio is out of town, but he left all of the lab set-up looking 
good.

Review of Minutes from the Last Meeting

We reviewed the minutes from the
[[GlueX_TOF_Meeting,_August_1,_2013#Minutes|August 1st meeting. There
were no significant comments.

Construction News

     FSU had made great progress on the gluing issue, PMTs to light
     guides. By eye, some joints had dull spots on the glue joints. In
     these cases, the tubes were removed and the guides sanded,
     polished and re-glued.

     One crate of modules has been packed for shipment.

         More wood for crates will be purchased now that the design is 
final.

     Each modules is being labeled so that the PMTs and scintillator
     can be identified if needed later. The marking will allow the
     installation location to be read off the modules. The plan is to
     pack modules with similar installation location together.

     Testing is proceeding, six modules at a time.

         The recent TDC failure stopped production for a while. The
         module was not recognizing a front panel trigger. The problem
         appears to be intermittent. It may depend on how the module is
         seated in the crate. Testing has re-started with instructions
         not to touch the crate. JLab is sending a replacement/spare to
         FSU.

Cosmic Test Studies

Sasha presented recent results on a variety of topics coming from the
cosmic tests using six modules. See his web page
(http://128.186.19.133/~ostrov/tof/20130815/) for details. The
sections of his page are:

     FADC signal shape
     High-voltage (gain) balancing
     Time-walk corrections
     Possible data selection cut
     Mystery of trigger timing jump

Sasha is also working on automating some of the steps in the module
testing procedure.

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