Revision as of 12:05, 22 February 2011

Location, Time

Friday, February 18, 2011
2:00 pm EST
JLab: CEBAF Center, Room F326/7

Agenda

1. Announcements
2. Minutes from the last meeting
3. Report from trip to U. of South Carolina: Paul
4. Prototype Status
5. Contract Status
6. TOF Schedule
7. Meeting time OK?

Communication

Videoconference

1. ESNet: 8542553
2. EVO: EVO site
   • direct meeting link
   • Phone Bridge ID: 6 9368

Telephone

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

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-1Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ .

Minutes

Present:

• FSU: Paul Eugenio
• JLab: Mark Ito (chair), Yi Qiang, Elton Smith, Sascha Somov, Simon Taylor, Tim Whitlatch, Beni Zihlmann

Test says PMT is as advertised, better than intrinsic.

Trip to SC to see Ralf

• good trip, with sasha • goals ∘ on design choices, compare and contrast ∘ resolution not at goal ∘ ESR beneficial or not • went over their procedures • time-walk corrections ∘ sasha trying to fit all parameters at once ∘ sc using iterative approach, not letting all parameters float ∘ without time walk corrections, factor of two worse ∘ Elton 1/sqrt(ph) not the right functional dependence ∘ laser might have different spectral response • TDC's ∘ resolution from electronics get something like 55 ps, the least significant bit ∘ Ralf gets the same thing, lsb value, except 25 ps from his CAEN device ∘ Why not go to CAEN TDC. ∘ will get from Mark Kibilko ∘ readout protocol should be OK • PMT choices ∘ SC using 8 stage, not the 10 stage ∘ 10 stage tube perhaps not available • ESR ∘ improved light collection results from FSU ∘ SC had poorer performance with ESR ∘ material they were calling ESR, looks like white Tedlar, not specular ∘ Ralf had mylar that he could not use and gave it to Paul • tour of lab ∘ alignment devices ∘ glueing tools, jigs • Contract ∘ assembly and testing document

Geometry

• making the counters wider may lose light • mounting pmt directly on scint like SC attractive • has not finalized proposal yet • need to talk about it next time • outside diameter with mu metal 6 cm • sc using 6 cm x 6cm counters • current design with steel tube more than adequate

schedule • tim shows one • pmt kind of thing JLab would buy • scint as well • others bought by FSU • contract has to be awarded PO goes out, 7 months from now

mu metal shield will be tested

rates for innermost paddles near the beam hole: how do we address that

get drawing from tim on