GlueX TOF Meeting, September 15, 2011
Contents
Location, Time
Thursday, September 15, 2011
10:00 am EDT
JLab: CEBAF Center, Room F326
Agenda
- Announcements
- Minutes from the last meeting
- Prototype Status
- Detector dimensions, light guide dimensions
- PMT base design, rates, currents, amplification
- Attempts to improve timing resolution [1]
- Contract Status
Communication
Videoconference
- ESNet: 8542553
- EVO: EVO site
- direct meeting link
- Phone Bridge ID: 10 4388
Telephone
- dial:
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
- enter access code followed by the # sign: 3421244#
Slides
Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-3Q
on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-3Q/ .
Minutes
Present:
- FSU: Paul Eugenio, Sasha Ostrovidov
- JLab: Chuck Hutton, Mark Ito (chair), Simon Taylor, Tim Whitlatch, Beni Zihlmann
Announcements
We talked about the meeting with Hamamatsu representatives scheduled for tomorrow here at JLab, mainly to discuss SiPM's. Paul has been talking to Andrew Allen of Hamamatsu who will be there and asked him some of the questions on current limits that we have been discussing. Beni and Mark will meet with the visitors over lunch to discuss these issues as well.
have magnetic shield extend beyond photocathode since we have a large enought order that should not be problem mechanically simple butt up against crystal
still a couple of gauss where the mu metal started
detector dimentions, light guide dimensions
machining straight piece before add 1cm straight
or extend and reduce radius of curvature
constraints from support, fcal
perhaps can trim in-board edge of iron cylinder
9 am thursday
make paddles a little longer
1.34 cm goes to 1.79 cm if double wrap of tedlar
3 mm gap between planes
tof and fcal face, there is 2 cm right now would like more space go to 3 cm
tof schedule
pmt procured in two weeks support structure, buy in spring by next may testing scintillators and light guides procure scint. nov. 2
may have to change divider to optimize for lower gain and add amplifier 10^8 vs. 10^7 contradiction between drawing and spec sheep sasha seeing 160 uA already with cosmics
sasha presentation
mystery with trigger counter