Difference between revisions of "GlueX Start Counter Meeting, November 15, 2012"
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==Scintillator Quality== | ==Scintillator Quality== | ||
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− | + | After aoub a month, the scintillator bars (those that were not broken) are showing visible signs of deterioration, with crazing on many areas of the surface. FIU showed photos of bars illuminiated from one end by a difuse laser light source. Loss of light is clearly seen. ???image??? | |
− | + | Werner has been in contact with McNeal about thier handling pracatices. Recall that instuctions on how to properlay handle scintillator had been sent tho the comany and they claim that those procedures were followed. Yet some samples of the same scintillatin gmaterial retained at FIU do not show any of degradation. | |
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+ | FIU will go ahead and test the bars in any case. They are considering how to proceed. The quality of the machining of the bars is good. | ||
looking at mcneal bar | looking at mcneal bar | ||
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3 mm bar srai=ght, also 204 bar, they look fine, kept at FIU, handled only by werner and Eric | 3 mm bar srai=ght, also 204 bar, they look fine, kept at FIU, handled only by werner and Eric | ||
− | + | ==Light Yield Studies== | |
+ | ==Equipment Difficulties== | ||
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mainframe hv died, can only turn on 2 or three channels | mainframe hv died, can only turn on 2 or three channels |
Revision as of 14:26, 15 November 2012
GlueX Start Counter Meeting
Thursday, November 15, 2012
10 am EDT
JLab: CEBAF Center F326/327
Contents
Agenda
- Announcements
- Review minutes from previous meeting
- Mechanical Design
- Read-out Design
- Simulation: Thickness studies
- Contract
Communication Information
Video Conferencing
- ESNet: 8542553
- EVO:
- Direct meeting link
- Phone Bridge ID: 13 2615
Slides
Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-4Q
on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-4Q/ .
Minutes
Present:
- FIU: Werner Boeglin, Puneet Khetarpal, Eric Pooser
- JLab: Chuck Hutton, Mark Ito (chair), Beni Zihlmann
SiPM Gain Measurement
Eric has done a single photo-electron measurement on a tube to determine its gain as a precursor to measuring the SiPM gain. Fernando Barbosa is waiting on this measurement to finalize his design.
Scintillator Quality
After aoub a month, the scintillator bars (those that were not broken) are showing visible signs of deterioration, with crazing on many areas of the surface. FIU showed photos of bars illuminiated from one end by a difuse laser light source. Loss of light is clearly seen. ???image???
Werner has been in contact with McNeal about thier handling pracatices. Recall that instuctions on how to properlay handle scintillator had been sent tho the comany and they claim that those procedures were followed. Yet some samples of the same scintillatin gmaterial retained at FIU do not show any of degradation.
FIU will go ahead and test the bars in any case. They are considering how to proceed. The quality of the machining of the bars is good. looking at mcneal bar
one broken edges look good a month has passed, noticing internal crazing as seen in previous bars took up to lab, looked at it with laser, see defects, see same haze o fine tracks, internal crazing 2mm ej212 bar originally sent same sort of deterization 3 mm bar srai=ght, also 204 bar, they look fine, kept at FIU, handled only by werner and Eric
Light Yield Studies
Equipment Difficulties
mainframe hv died, can only turn on 2 or three channels 1454 want to borrow something CAEN unit belongs to pyrex need 6 channels model number for caen mainframe look at hall b mainframe caen sy2527
dollar amount of contract, does that sijmplify
frame proposal writing process for werner measure scintillators get them started on next batch no money, get started on next batch
is there a way we can fund them