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Hi,
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<div class="">please find the transmittance plots updated using the new dark current, for all cookies, here:</div>
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<div class=""><a href="https://www.dropbox.com/s/hddfavyk5xiphs7/cookies_transmission_slides_newDC1.pdf?dl=0" class="">https://www.dropbox.com/s/hddfavyk5xiphs7/cookies_transmission_slides_newDC1.pdf?dl=0</a></div>
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<div class="">The summary of the measurements is here:</div>
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<div class=""><a href="https://gluexdirc.mit.edu/transmission-measurements" class="">https://gluexdirc.mit.edu/transmission-measurements</a></div>
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<div class="">Conclusions in short are:</div>
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<div class="">- dark current taken as measurement at 200 nm provides consistent results between two days, also the transmittance does not drop for wavelengths < 350 nm as it used to</div>
<div class="">- transmittance for quartz windows is ~93% and flat, which is consistent with the Fresnel limit for this case (93%)</div>
<div class="">- FCAL cookie is very good </div>
<div class="">- Eljen cookies have lower transmittance than ours for wavelength < 400 nm</div>
<div class="">- our 2 mm thick cookies ensure relative transmittance > 97% (consistent with Belle II data) with both RTV615 and TSE3032 materials</div>
<div class="">- transmittance is consistent with data from manufacturers, Belle II data, and JLab data [1407.3258v1]</div>
<div class="">- cleaning/storing procedures should be refined, they affect measurements at ~ 4-5% level</div>
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<div class="">Best regards,</div>
<div class="">Maria</div>
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<div class="">On Dec 15, 2016, at 12:44 PM, Justin Stevens <<a href="mailto:jrsteven@jlab.org" class="">jrsteven@jlab.org</a>> wrote:</div>
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<div class="">Hi All,<br class="">
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We'll have a DIRC meeting tomorrow at 11 am. You can find the agenda at <a href="https://halldweb.jlab.org/wiki/index.php/December_16,_2016_PID_Upgrade" class="">
https://halldweb.jlab.org/wiki/index.php/December_16,_2016_PID_Upgrade</a>.<br class="">
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-Justin<br class="">
_______________________________________________<br class="">
Halld-pid-upgrade mailing list<br class="">
<a href="mailto:Halld-pid-upgrade@jlab.org" class="">Halld-pid-upgrade@jlab.org</a><br class="">
https://mailman.jlab.org/mailman/listinfo/halld-pid-upgrade<br class="">
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