GlueX PID Meeting, March 19, 2010
Location, Time
Friday, March 19, 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
- Announcements
- Meeting name change progressing
- Minutes from the last meeting
- Time-of-Flight Status: Paul
- Rates in the TOF: Sascha S.
- Start Counter Status: Werner
- Target Status: Rory
- Action Items
Minutes
3/19
rory sasha Paul, Mark, Simon, Beni, Chris K., elliott
Chris: money, pulse tube refrigerator, get a quote, give to Eugene, buy one proposed, 40k compressor and refrigerator
tim: look on p3e schedule, not on official list
jan 2012, purchase liquid supply lines,
sasha asks about aram could not get back to us from is in canada position ran out mid feb u of t post doc search being organized halld instrumentation for this position pass the word
werner working on hiring and mou wants to talk to tim elton: signatures on mou concerns from provost seema contract finished at end of Jan going to hire another post-doc, get some money from chicago test plans for scintillator paddles? would like to get a new sipm
an array
if power supplies are the same, testing should take a month
10 mm x 3 mm counters
bending plastic?
bending not bad, machining afterward is the problem bend then machine the sides to make them fit into an array
sascha asked about thickness
40 to 60 cm attenuation length light tranport the problem
time-of-flight: Paul
big question, choice of pmt's
thrust was comparison of new hamatsu tubes vs xp2020 new tubes performed better, but were 10 stages h10534 hit at far end only got to 97% gain 1.5, 1.1 from not-optimal tube about $800 w/ base and shield, half cost of xp2020 xp2020's gain 1x10^7 sasha working on cfd vs le comparisons
have two tubes now
want to add more paddles want to study half length paddles can light be coupled around hole to get two-ended read-out
paul will get quotes, send them to mark
adc's, vxs crate, cut the pins, slots modified
want one 12-bit fadc, only one paul will explore using integrating adc cfd originally only for testing discussion with Richard Jones caen 30 MHz rated, cfd Richard at 5 MHz
Beni: higher rate than older studies, more like 3 or 4 MHz
richard found 5 MHz was the limit
Elton asks why low energy stuff in specturm is not so large
reconstruction is shitty, correlation between particle that causes hit and hit not clear
might have to have finer segmentation
what is real current going through tubes and whether they can stand it might have to go to amplifiers
what is effect longitudinal split
MOU
comments incorporated, will talk with chair, changes in dept., now have designer who has transitioned to servicing entire dept, not just condensed matter
Paul will send the latest update to everyone.