Difference between revisions of "GlueX Start Counter Meeting, January 27, 2011"
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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
Contents
Location, Time
Thursday, January 27, 2011
3:30 pm EST
JLab: CEBAF Center, Room F326/7
Agenda
- Announcements
- Review minutes from previous meeting: all
- Start Counter News: Werner, Lei, Eric
- Pictures see http://wanda.fiu.edu/boeglinw/GlueX/SC
- MOU plans: all
Communication Information
Telephone
To connect by telephone:
- dial:
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
- enter access code followed by the # sign: 3421244#
Video Conferencing
- ESNet: 8542553
- EVO:
- Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=eaeDetvlv8a9asasIa
- Phone Bridge ID: 8 5557
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