Difference between revisions of "Time-of-Flight/Start-Counter/Target Meeting, March 5, 2010"
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# Announcements | # Announcements | ||
## Nominal electronics chain posted: Mark [[Image: Electronics Time of Flight.png|thumb|TOF electronics chain]][[Image: Electronics Start Counter.png|thumb|Start counter electronics chain]] | ## Nominal electronics chain posted: Mark [[Image: Electronics Time of Flight.png|thumb|TOF electronics chain]][[Image: Electronics Start Counter.png|thumb|Start counter electronics chain]] |
Revision as of 10:26, 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
- Minutes from the last meeting
- Announcements
- Nominal electronics chain posted: Mark
- Nominal schedule highlights: Mark
- Meeting outreach: Mark
- Time-of-Flight Status: Paul
- MOU status
- Meeting name change, "The PID Meeting?": Mark
- Action Items
Minutes
for 3/5/10
beni, mark, elton, simon, eugene, elliott, sascha sasha
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