GlueX TOF Meeting, May 27, 2011

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Location, Time

Friday, May 26, 2011
2:00 pm EDT
JLab: CEBAF Center, Room F326

Agenda

  1. Announcements
  2. Minutes from the last meeting
  3. Prototype Status [1]
  4. Contract Status

Communication

Videoconference

  1. ESNet: 8542553
  2. EVO: EVO site

Telephone

  1. dial:
  2. enter access code followed by the # sign: 3421244#

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-2Q/ .

Minutes

Present:

  • FSU: Sasha Ostrovidov
  • JLab: Eugene Chudakov, Mark Ito (chair), Elton Smith, Sascha Somov, Simon Taylor, Ivan Tolstukhin, Beni Zihlmann

Status Report from Paul

Paul Eugenio could not join us, but sent in a written report:

We received the VM2000ma from 3M, and I sent 3 sheets to FIU. We also received the VXS crate, and have swapped it into our test system. We discovered that our test counter PMTs were sagging and separating at the light guide. This was due to using a silicon cookie rather than a glued pmt/light guide joint. We have glued all PMTs now, and Sasha is ready to restart tests.

I have two new students joining our tof effort: Aristedis Tsaris and Hussein Al Goul. They have started getting familiar with our test set up, measuring plateaus, efficiencies, and spectra. They are constructing short paddles and will study single pmt readout and coupling of light from bar to bar, but they will now spend a few weeks at JLab for Hugs.

Status Report from Sasha

Sasha reported on several items.

  • The new crate is working well. Now, all modules can be plugged into the single crate with no sag in the power supplies.

Summary of Goals from Beni

repeat resolution measurements with cosmics

light guide production, 6 of them, one not bent now light guides glued

one straight, one bent comparison tapered section factor of two longer, with same overall length 

 see effect of taper
 both straight light guides

try elgen discriminator with new set-up

talked to tim 

 has assigned chuck hutton as designer
 will talk next week with chuck, get him in contact with designer at FSU

buy light guide material 

 need to pick that up, they are running out
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