https://wiki.jlab.org/cuawiki/index.php?title=General_Meeting_Summary_4/5/18&feed=atom&action=historyGeneral Meeting Summary 4/5/18 - Revision history2024-03-28T12:12:28ZRevision history for this page on the wikiMediaWiki 1.35.7https://wiki.jlab.org/cuawiki/index.php?title=General_Meeting_Summary_4/5/18&diff=1517&oldid=prevHornt at 22:33, 7 April 20182018-04-07T22:33:53Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Action Item: measure another 20 PMTs</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Action Item: measure another 20 PMTs</div></td></tr>
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</table>Hornthttps://wiki.jlab.org/cuawiki/index.php?title=General_Meeting_Summary_4/5/18&diff=1516&oldid=prevHornt: Created page with "PROTOTYPE AND SIMULATION (Vladimir, Alex Somov) * Discussion of prototype cosmic data analysis result vs. simulation of the prototype setup - globally looks good ::* Action I..."2018-04-07T22:33:34Z<p>Created page with "PROTOTYPE AND SIMULATION (Vladimir, Alex Somov) * Discussion of prototype cosmic data analysis result vs. simulation of the prototype setup - globally looks good ::* Action I..."</p>
<p><b>New page</b></p><div>PROTOTYPE AND SIMULATION (Vladimir, Alex Somov)<br />
<br />
* Discussion of prototype cosmic data analysis result vs. simulation of the prototype setup - globally looks good<br />
::* Action Items: <br />
::::* Remove LY source comparison as setup is different and cannot directly compare with prototype<br />
::::* Add assumptions that went into simulation<br />
::::* Add conditions for prototype measurement<br />
<br />
* Discussion of prototype calibration studies<br />
::* Demonstrates calibration procedure<br />
::* Energy resolution on order 2.1% (ideal would be 1.3-1.4%) - currently limited by setup to improve resolution<br />
:: Action Items:<br />
::::* Test different high voltages - at low voltages particularly susceptible to magnetic fields<br />
::::* Check if possible to remove additional material (TRD, GEM etc.) to reduce scattering<br />
<br />
* COMCAL as prototype - design is flexible to accommodate a carbon structure to hold crystals<br />
<br />
<br />
PMT DIAMETER MEASUREMENT (Vladimir, Hamlet)<br />
<br />
* Measurement of 20 PMTs were performed by Hamlet<br />
<br />
* Result is 18.86 +- 0.066 mm (systematic error is 25um)<br />
::* This tolerance is 10x smaller than that quoted by the manufacturer (18.6 +- 0.7 mm)<br />
<br />
* Action Item: measure another 20 PMTs<br />
<br />
CRYSTALS (Vladimir, Rong Wang, Ho San, Tanja, Carlos)<br />
<br />
* Visual inspection of 40 crystals from SICCAS shipment 3 shows the most of these are not passing requirement due to old labels traces, yellow coloring, significant cracks and bubbles in bulk and on surface<br />
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* Ongoing work at IPNO on cross calibrating the crystal testing setups - now have a much better understanding, results will be shown at a future meeting<br />
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* Discussions with CRYTUR ongoing - there has been a delay with obtaining the required crucibles for making crystals to NPS specifications, but the company expects to start first tests in the second part of April<br />
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NPS FRAME (Carlos)<br />
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* Ongoing work: handling cables in back<br />
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* Discussion about frame simulation spectra with different gap widths. <br />
::* Previous studies have shown that up to 1mm gaps are reasonable and tail contribution not a concern<br />
::* For larger gaps contribution of tail can be significant<br />
::* Might be good to quote FWHM instead of RMS<br />
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MAGNET (Bogdan)<br />
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* Assembly and testing to start in April<br />
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TCS BACKGROUND STUDIES (Vardan)<br />
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* Discussion of simulation results<br />
::* Current used is standard CPS current of 2.5uA electron beam<br />
<br />
* Based on rates simulation may need to exclude central region of tracker - this cutout propagates to more backward detectors<br />
::* Marie's studies suggest that removing this region does not affect the physics<br />
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* Discussion about electron/positron energy spectrum and why no electrons above 2 GeV - seems to be due to finite angular acceptance, but might require further study<br />
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TCS Uncertainties (Marie)<br />
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* Discussion of current results - need to iterate with Vardan's recent studies<br />
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NEXT MEETING: THURSDAY 26 APRIL AT 9:00AM (EDT)</div>Hornt