Difference between revisions of "GlueX PID Meeting, March 19, 2010"

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# Target Status: Rory
 
# Target Status: Rory
 
# [[Time-of-Flight/Start-Counter Action Items|Action Items]]
 
# [[Time-of-Flight/Start-Counter Action Items|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.

Revision as of 16:09, 19 March 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

  1. Announcements
    • Meeting name change progressing
  2. Minutes from the last meeting
  3. Time-of-Flight Status: Paul
  4. Rates in the TOF: Sascha S.
  5. Start Counter Status: Werner
  6. Target Status: Rory
  7. 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.

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