GlueX TOF Meeting, April 11, 2013

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GlueX TOF Meeting
Thursday, April 11, 2013
10:00 am EDT
JLab: CEBAF Center, F326/327

Agenda

  1. Announcements
  2. Review of last TOF bi-weekly meeting
  3. Construction news
  4. Invoicing changes and status
  5. Installation plan and document

Communication

Videoconference

  1. ESNet: 8542553
  2. SeeVogh:

Desktop Sharing

  1. Go to http://esnet.readytalk.com
  2. In the "join a meeting" box enter the Hall D code: 3421244
  3. Fill in the participant registration form.

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2013-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2013-2Q/ .

Minutes

Present:

  • FIU: Sasha Ostrovidov
  • JLab: Chuck Hutton, Beni Zihlmann (chair)
  1. first 5 production paddles have light guides glued to them and are now in the wrapping room for wrapping.

2) the wrapping procedure has been changed slightly such that the light guide 

   is wrapped with a separate independent piece of reflective material

that is 

   templated to fit the light guide better. A small strip of aluminium

foils is used 

   at the intersection between the scintillator and the light guide.

3) currently Paul Eugenio is doing the wrapping. He has not yet trained students 

   to do the job. And because he is currently at the APS meeting the

wrapping is 

   on hold.

4) Maurizio is polishing the light guides. 70 LG have been already polished. 5) 10 out of the 92 production bars have been measured in the dark box using 

   UV led to determine the attenuation length. It was found that one

paddle had 

   a very small attenuation length. After contacting ELJEN the

manufacturer agreed 

   to send them a new paddle. According to them it could be that this

paddle came 

   from the edge of a batch and probably should never have been

shipped in the first 

   place as there edge parts are usually discarded.

6) During the attenuation measurement the paper is completely removed from the paddle 

   as the glue of the paper destroys the internal reflection and

distorts the measurement. 7) Chuck is working on the TOF-frame design but is not yet finished. 8) the Mini-TOF stand is still assembled as it is still in used as show and tell object for the 

   FSU administration.
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