Time of Flight Meta Meeting
Contents
Location, Time
Thursday, April 2, 2009
2:45 pm EDT
CEBAF Center, Room F326/327
EVO: direct meeting link (we will try this first)
Conference Group: 800-377-8846, participant code: 39527048
ESNet: 8542553
Agenda
- 12 GeV Project schedule and GlueX time-of-flight
- mechanical engineering support
- current status of effort
- need/schedule for future meetings
Minutes
Present:
JLab: Eugene Chudakov, Mark Ito, Elton Smith, Alexander Somov, Simon Taylor, Beni Zihlmann
FSU: Paul Eugenio, Alexander Ostrovidov
Schedule and Budget
- Eugene mentioned that the PED phase of the 12 GeV Project is over, yet there are still some items on the time-of-flight (TOF) that are a bit behind. These include developing designs for the scintillators, bases, support structure, splitters and an integration plan.
- Under the construction phase there is procurement of scintillators, light guides, power supplies, PMT's, cables, etc. along with assembly and testing.
- The schedule can be found among the pre-brief material for the installation review.
Mechanical Engineering Support
- Paul has two machine shops available at no cost at FSU. They have simple design capabilities, but probably cannot produce the formal design drawings needed for the final design.
- Elton mentioned that those resources were probably sufficient to usefully iterate and test designs and then a mature version could be produced at JLab.
machine shop is building light guides hope to have a piece tomorrow
paul: draft of mou has expectations for fsu and jlab modeled on cmu mou
620k allocation for construction
fiscal year 12 starts construction, cannot be pushed forward with stimulus money
scint width 6 cm funds transfered from upv tof for initial studies wider scint bought ? for study light guide design complicated, shields will not fit in straightforward arrangement 1. bend left and right, current solution 2. wider bar might also solve problem
might affect time resolution
for study, straight trapezoidal light guide, being produced now. problem with 2in thick uvt, elgin ran out iu proposed fish-tail iu studied with pmt on scint, fsu wants to study effect of light guide
pmt to be used xp2020 in hand 2x hama h10570 8 stage, h10534 10 stage photonis: xp20v0 8-stage version $800 quotes from photonis $1610, tube only hamamatsu were $810 w/ bases, zener, mu metal shield at 100 or more photonis base $250 extra transient time spreads are comparable
beni: 780$ per tube, 200 tubes
$190k in budget for pmt, dividers shield
constant fraction depends on rate budget has adc and tdc: beni sasha 2 mHz worked fine
recycled pmt's? somov hera-b had hamamatsu pmt's for shaslik calorimeter babar holding on to their stuff
schedule has lots of manpower for assembly and testing during construction
113k$ for calibration system for tof alone
elton: things not fitting, makes sense to have straight light guides, scint which are displaced but slightly overlapping
1 inch thick counters
fsu study looked at width of total array particles remain in the diameter of the solenoid will try to review for info on angle of incidence
beni: overlap design will have trajectories that have small path length in scintilator
another meeting in two weeks
paul will contact mark with questions about mou's language on jlab will carry the ball on say, support stand
details need
21k$ for materials for support structure
meeting considered useful incorporate start counter
