Difference between revisions of "GlueX Start Counter Meeting, July 28, 2011"

From GlueXWiki
Jump to: navigation, search
 
(notes as minutes)
Line 32: Line 32:
  
 
Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2011-3Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-3Q/ . You have to be a member of the "halld" Unix group to do this.
 
Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2011-3Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-3Q/ . You have to be a member of the "halld" Unix group to do this.
 +
 +
=Minutes=
 +
 +
present:
 +
 +
puneet, beni, simon, mark, tim, sascha, eugene
 +
werner, lei, eric
 +
 +
box in operation
 +
using to test long solid light guide
 +
at end of 140, lose factor of 2 in time resolution
 +
6mm thich by 10 mm wide
 +
10 mm wide scintillator
 +
tried using without wrapping
 +
and with reflective material,
 +
used grease -> 1.5
 +
 +
got scintillator from plastic craft
 +
look at them recently
 +
quality not that great, scratches, milky
 +
scintillato that looks worse
 +
at tend of scintillator, 300-400 ps
 +
bend section, just about as good
 +
go to small point , 600 ps
 +
fmpmt
 +
connect to light guide, 600 ps- 1 ns expected
 +
can be improved by scint surface quality
 +
want to measure all 5 to see if response if uniform
 +
vapor polishing look promising
 +
 +
today, tried fiber light guide, new mounting
 +
will be connecting to try
 +
now working only with photomultipliers
 +
intrinsically better resolution
 +
 +
fmpmt, max field one tesla, orientation crucial, at 30 degrees, optimal
 +
 +
tim want drawing, straight 394 mm straight, bend readius 20 mm, 17 degrees
 +
 +
werner will send drawing to tim
 +
 +
werner thinks cylindrical,
 +
eugene raised
 +
lots of fiber
 +
if you come up with idea on bend section then werner will try
 +
might lose a lot of light
 +
 +
sipm fernando, managed to get sub ns resolution,
 +
bias voltage not stable, added capacitor close to sipm, bypass cap,
 +
rise time went to 5 ns, decay issues
 +
 +
sasha 180 ps for 3mm sipm
 +
20-22 ns
 +
16 ns
 +
 +
MOU going around for signatures

Revision as of 08:23, 29 July 2011

Location, Time

Thursday, July 28, 2011
3:30 pm EDT
JLab: CEBAF Center, Room F326/7

Agenda

  1. Announcements
  2. Review minutes from previous meeting: all
  3. Start Counter News
  4. MOU status

Communication Information

Telephone

To connect by telephone:

  1. dial:
  2. enter access code followed by the # sign: 3421244#

Video Conferencing

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-3Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

present:

puneet, beni, simon, mark, tim, sascha, eugene werner, lei, eric

box in operation using to test long solid light guide at end of 140, lose factor of 2 in time resolution 6mm thich by 10 mm wide 10 mm wide scintillator tried using without wrapping and with reflective material, used grease -> 1.5

got scintillator from plastic craft look at them recently quality not that great, scratches, milky scintillato that looks worse at tend of scintillator, 300-400 ps bend section, just about as good go to small point , 600 ps fmpmt connect to light guide, 600 ps- 1 ns expected can be improved by scint surface quality want to measure all 5 to see if response if uniform vapor polishing look promising

today, tried fiber light guide, new mounting will be connecting to try now working only with photomultipliers intrinsically better resolution

fmpmt, max field one tesla, orientation crucial, at 30 degrees, optimal

tim want drawing, straight 394 mm straight, bend readius 20 mm, 17 degrees

werner will send drawing to tim

werner thinks cylindrical, eugene raised lots of fiber if you come up with idea on bend section then werner will try might lose a lot of light

sipm fernando, managed to get sub ns resolution, bias voltage not stable, added capacitor close to sipm, bypass cap, rise time went to 5 ns, decay issues

sasha 180 ps for 3mm sipm 20-22 ns 16 ns

MOU going around for signatures

Retrieved from "https://halldweb1.jlab.org/wiki/index.php?title=GlueX_Start_Counter_Meeting,_July_28,_2011&oldid=28919"