Difference between revisions of "GlueX Start Counter Meeting, January 27, 2011"

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(notes as minutes)
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Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2011-1Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ . 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/2011-1Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ . You have to be a member of the "halld" Unix group to do this.
 +
 +
=Minutes=
 +
 +
* '''FIU''': Eric, Lei, Werner
 +
* '''JLab''': Simon Beni Sascha Eugene Mark
 +
 +
$190 a piece, sent to furniture company,
 +
with diamond milled edges
 +
plastic craft : bend cut and polish
 +
 +
sasha: richard wrote a note estimating impact of dark current
 +
• timing resolution not much affected by rate
 +
• went to GHz
 +
• photonique recover rate gives fluctuation
 +
• hamamtsu has faster recovery rate
 +
 +
measurements with new SiPM
 +
• timing resolution a bit disappointing
 +
• more test with the new scintillator, with PMT
 +
∘ light output
 +
∘ attentuaion length
 +
• then with SiPM
 +
∘ even with same amount of light, get factor 1.5-2 worse resolution
 +
∘ pulse with led works well with SiPM
 +
∘ more study needed
 +
∘ cannot see single pe peak, pedestal is wide
 +
 +
50 mV signal from SiPM, amplified to 200 mV
 +
ADC uses direct signal
 +
 +
don't think it is the amount of light
 +
played a bit with bias voltage, nominally 71 V
 +
using what Carl ways
 +
 +
using cfd's
 +
 +
peltier element
 +
 +
werner will send MOU
 +
 +
time resolution requirement: what is it? what do we put in MOU.
 +
 +
E. put in purpose
 +
 +
W. may take some details out.
 +
 +
photo-detectors in a region of substantial magnetic field
 +
 +
sascha: use the tagger to help
 +
 +
total 56 K$
 +
labor: 170 man-weeks for labor

Revision as of 18:09, 27 January 2011

Location, Time

Thursday, January 27, 2011
3:30 pm EST
JLab: CEBAF Center, Room F326/7

Agenda

  1. Announcements
  2. Review minutes from previous meeting: all
  3. Start Counter News: Werner, Lei, Eric
  1. MOU plans: all

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/2011-1Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

  • FIU: Eric, Lei, Werner
  • JLab: Simon Beni Sascha Eugene Mark

$190 a piece, sent to furniture company, with diamond milled edges plastic craft : bend cut and polish

sasha: richard wrote a note estimating impact of dark current • timing resolution not much affected by rate • went to GHz • photonique recover rate gives fluctuation • hamamtsu has faster recovery rate

measurements with new SiPM • timing resolution a bit disappointing • more test with the new scintillator, with PMT ∘ light output ∘ attentuaion length • then with SiPM ∘ even with same amount of light, get factor 1.5-2 worse resolution ∘ pulse with led works well with SiPM ∘ more study needed ∘ cannot see single pe peak, pedestal is wide

50 mV signal from SiPM, amplified to 200 mV ADC uses direct signal

don't think it is the amount of light played a bit with bias voltage, nominally 71 V using what Carl ways

using cfd's

peltier element

werner will send MOU

time resolution requirement: what is it? what do we put in MOU.

E. put in purpose

W. may take some details out.

photo-detectors in a region of substantial magnetic field

sascha: use the tagger to help

total 56 K$ labor: 170 man-weeks for labor

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