Revision as of 10:27, 8 March 2010

Location, Time

Friday, March 5, 2010
2:00 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/2010-03 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/2010-03/ .

Agenda

1. Minutes from the last meeting
2. Announcements
   1. Nominal electronics chain posted: Mark
      

      TOF electronics chain
      

      Start counter electronics chain
   2. Nominal schedule highlights: Mark
   3. Meeting outreach: Mark
3. Time-of-Flight Status: Paul
   • MOU status
4. Meeting name change, "The PID Meeting?": Mark
5. Action Items

Minutes

JLab: Eugene Chudakov, Mark Ito (chair), Elton Smith, Sascha Somov, Simon Taylor, Elliott Wolin, Beni Zihlmann
FSU: Sasha Ostrovidov

Chris will send flash adc to FSU, perhaps test crate VXS, email a week ago

 wanted to show modification, connector removed from crate

Elton asked about using flash for tests. Introducing complication perhaps an integrating adc would suffice sasha has CAEN integrating ADC Eugene agrees with Elton's opinion Elliott: read-out libraries won't work in fsu set-up cfd vs. le, the next question

100% efficiency only at highest voltages for tubes want to buy 6 new H. PMT's with higher gain 900$ each

E: if efficiency poor, pulse height may be small, timing resolution may not be optimal need to demonstrate signals with robust amplitude and appropriate thresholds 30 mV thresholds

bought uv lucite making 6 more light guides want to go to 4 paddles (from current 1 paddle setup) have 6 tof paddles in hand, of different sizes, two of correct size 7 cm and 8 cm wide, 6 cm desired thickness: 1 inch light guides single piece tested w and w/o light guides, 1% efficiency degradation light guide coupled to paddle with optical grease pmt to light guide??? machine shop has new equipment, can not make the one piece design

E: pmt's? S: Same pmt, but improved version, claim to have higher gain v1 10^6, v2 4x10^6, minimum gain 2x10^6

E: why not an amplifier? counting rate 1 kHz at 2000 V amplifier should not affect resolution 30 mV a bit of a high threshold 10 mV tried

planning to get a parallel trigger paddle, take signal from both ends, measure mean time resolution

Beni: rate of 2kHz,

for this tube maximum is the working voltage

pmt came from hamamatsu with base and shield

10533 10534 (comes with base)

werner is skiing, led pulser system

E: can use xp2020 to check that set-up is working

want to see plateau

resolution, 125 ps hamatsu, caen cfd, nim cfd 100 ps

beni got 80 ps

check 12-mar-

paul sent around a draft of the mou