Revision as of 12:55, 27 October 2011

Thursday, October 27, 2011
10:30 am EDT
JLab: CEBAF Center, Room F326

Agenda

1. Announcements
2. Minutes from the last meeting
3. Mechanical design: Tim, Chuck
4. PMT base design, rates, currents, amplification Beni
5. Prototype status: Paul, Sasha
6. Contract Status: Mark

Communication

Videoconference

1. ESNet: 8542553
2. EVO: EVO site
   • direct meeting link
   • Phone Bridge ID: 10 4388

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-4Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-4Q/ .

Minutes

Present:

• FSU: Sasha Ostrovidov
• JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair), Simon Taylor, Tim Whitlatch, Beni Zihlmann

chuck will send chuck a new model standard light guide stays the same, half width needs to be redone,

beni,

operating at 0.02 mA no distinction between 10 and 8 stage tube 5 times less than max recommended current after 5000 hours gain down by factor of 2

checked ADC gain

have not looked at 8 stage tube yet

work on support of lightguides, phototubes

clamshell arrangement

pushing forward on holding steel still have not decided on attachment of pmt on light guide?

ask about Hall C experiment ask Bogdan about big byte

can it be arranged to have horizontal surfaces for replacement glueing

need to choose a glue to facilitate changing the phototube

need to have a design that allows replacement of tubes

now have splitters, doing measurements with all six splitters the same, takes about two weeks to do a single measurement, working with 50/50 now ill change wto 20/80

contract, can be done without complete specs