Difference between revisions of "GlueX TOF Meeting, September 15, 2011"

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=Minutes=
 
=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

Revision as of 14:58, 15 September 2011

Location, Time

Thursday, September 15, 2011
10:00 am EDT
JLab: CEBAF Center, Room F326

Agenda

  1. Announcements
  2. Minutes from the last meeting
  3. Prototype Status
    • Detector dimensions, light guide dimensions
    • PMT base design, rates, currents, amplification
    • Attempts to improve timing resolution [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/2011-3Q 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

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