Difference between revisions of "GlueX TOF Meeting, February 18, 2011"

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Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2011-1Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ .
 
Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2011-1Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ .
 +
 +
=Minutes=
 +
 +
TOF Meeting, 2/18
 +
 +
JLab: Mark, Tim, Sascha, Simon, Tim, Beni, Elton, Yi
 +
FSU:
 +
 +
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

Revision as of 12:02, 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

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/2011-1Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ .

Minutes

TOF Meeting, 2/18

JLab: Mark, Tim, Sascha, Simon, Tim, Beni, Elton, Yi FSU:

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

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