GlueX TOF Meeting, January 21, 2011

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Location, Time

Friday, January 21, 2011
2:00 pm EST
JLab: CEBAF Center, Room F326/7


  1. Announcements
    • Meeting time ok?
  2. Minutes from the last meeting
  3. Prototype Status
  4. Contract status



  1. ESNet: 8542553
  2. EVO: EVO site


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


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2011-1Q on the JLab CUE. This directory is accessible from the web at .



  • FSU: Sasha Ostrovidov
  • JLab: Hovanes Egiyan, Mark Ito (chair), Yi Qiang, Sascha Somov, Simon Taylor, Beni Zihlmann

Status of the Prototype

  • Mark needs to check on getting a crate for FSU.
  • Paul has been thinking of a different geometry for the TOF, to aid mechanical construction and support. The principal change would be to go from 6 cm wide counters to 8 cm. This would allow all of the phototubes to lie on the same plane; in the 6 cm design, the μ-metal shield would cause interference if the tubes were co-planar. Space between the tubes be used for a support structure. Some implications:
    1. The beam hole bigger would be bigger.
    2. The double-hit probability would be higher.
    3. The rate on the inner counters might increase (or decrease).
    4. We would likely lose light with a wider paddle.
    • Sasha O. is running Monte Carlo to study the effect.
  • FSU is exploring getting equipment to use UV-curing glue, as suggested by Beni at the last meeting. They have been talking to the Detector Meisters (Brian Cross and Carl Zorn) and folks in Hall C on their experience. A system would cost a few thousand dollars.
    • JLab, groups, several K$
    • Brian and Carl, Hall C group
  • The prototype is taking data. The data has not been analyzed completely yet. There are some mysteries that Sasha is working to understand.
  • A Hamamatsu PMT was shipped to JLab from FSU. It should arrive soon.

Status of the Contract

Mark showed a wiki page listing items needed to put a construction contract into place. Beni commented on his experience working on the contract with CMU.