Time-of-Flight/Start-Counter Meeting, August 21, 2009
Location, Time
Friday, August 21, 2009
3:00 pm EDT
JLab: CEBAF Center, Room F326/7
ESNet: 8542553
EVO: direct meeting link
Conference Group: 800-377-8846, participant code: 77438230
Slides: talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2009-08 on the JLab CUE (you have to be a member of the "halld" group). This directory is accessible from the web at https://halldweb1.jlab.org/talks/2009-08/ .
Agenda
- Minutes from the last meeting
- Time-of-Flight Status
- Start Counter Status
- Action Items
Minutes
FIU: Seema Dhamija
FSU: Sasha Ostrovidov
JLab: Eugene Chudakov, Mark Ito (chair), Elton Smith, Simon Taylor, Tim Whitlatch
maurizio fsu engineer, will import 3d model
sipm trouble, hall b, radiation unknown, failed when in an electron beam, don't think it is an issue for us
time-of-flight problem with one of the hamamatsu, not getting to 100% efficiency switching electronics does not change behavior, 1750 is max and nominal 20 mV threshold swap pmt's problem moves with pmt Paul trying to get another tube hamamatsu h10534 trying to measure adc spectrum as trigger moved along length perhaps an amplifier
seema
3 mm thick sipm testing with led pulser, 120 ps, rise 10 ns testing scintillators, fine mesh pmt, used last year, sipm on other end, coupled directly to scintillator studies with cosmics rays, 2cm region with trigger, next meeting distributions to show geometry from Werner in place plots of radiation length as function of polar angle
