GlueX TOF Meeting, November 8, 2012

GlueX TOF Meeting
Thursday, November 8, 2012
10:00 am EDT
JLab: CEBAF Center, F326

Agenda

1. Announcements
2. Review of last TOF bi-weekly meeting
3. Mechanical design
   1. MiniTOF
   2. TOF Gluing Fixture
   3. TOF Module Wrapper
4. PMT testing
5. Contract status
6. Calibration and Alignment
7. Technical Design Report contribution

Communication

Videoconference

1. ESNet: 8542553
2. EVO: EVO site
   • meeting link
   • Phone bridge ID: 13 7104

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-4Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2012-4Q/ .

Minutes

Present:

• FSU: Sasha Ostrovidov
• JLab: Mark Ito (chair), Tim Whitlatch, Beni Zihlmann

PMT Testing

The second batch of PMTs was received at FSU. Sasha has completed the complete set of tests (at least those that have been used up until now) on batch 2. They look good: single-photoelectron peaks are visible and the measured gain agrees well with those on the Hamamatsu data sheets.

The cathode light sensitivity measurements are still being developed. Sasha has been testing stability of a UV LED and sees day-night-like variations of up to 10%. Beni suggested trying to use a reference tube to correct for variations in LED brightness. Also Mark noted that if the variation is strictly due to temperature, a direct temperature correction might be sufficient. Sasha will start with the reference tuber approach.

Testing of th tubes now goes at the rate of ten per day. There is a student working with Sasha, with testing shifts taken by each.

Sasha is working on bringing up a LeCroy 1458 mainframe system for computer control of the high voltage. Mark will try to find a manual to send to him.