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<div class="">Going from the cylindrical mirror geometry of FDIRC</div>
<div class="">to the flat mirror (albeit segmented) geometry of GlueX<br class="">
does remove the focussing of the FDIRC design<br class="">
and re-introduces the pin-hole "focussing"<br class="">
as it was present in the BaBar DIRC.<br class="">
The mirror segmentation "only" helps to reduce the MaPMT area,<br class="">
using the vertical shift as described in lines 79-81.</div>
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<div class="">— this comment does not require my action, right?</div>
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<div>Doesn't seem like it. </div>
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<div class="">Figure 3: middle flat mirror (in yellow) - what is the purpose</div>
<div class="">of this mirror? Given that there is the fused silica to water<br class="">
transition before, changing photon directions, which renders<br class="">
the continuation of the 30 degrees top wedge slope pointless.</div>
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<div>Does he mean that no photons should hit the mirror that continues the top of the old wedge? You and/or John can check how often photons hit there (I think it's not very many). </div>
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<div class="">Fig. 3: Though it is no doubt true that a water filled camera is less expensive than fused silica, the magnification at the interface is a mixed blessing. <br class="">
Our experience with long term reflectivity of mirrors in water is less optimistic than the test you describe in ref 9. Have you done accelerated tests (at high temperature)? </div>
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<div>Here I'd remind him that we will use ordinary distilled water. </div>
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<div class="">2. In the following pic the referee asked to add labels for the DIRC boxes and camera. </div>
<div class=""><span><2016-12-21_12-20-01.png></span></div>
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<div>Are you asking then for whoever made this plot to add the labeling?</div>
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<div class="">3. Referee suggested to add PID performance plots (currently I have the ones below) for the forward part - I’m not sure I know where to take them from.</div>
<div class=""><span><2016-12-21_12-20-46.png></span></div>
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<div>Presumably there are some official ones to use that have been previously shown in public. </div>
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<div class="">4. Comment is “slide vertically - swap” for the sentence:</div>
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<pre style="margin-top: 0px; margin-bottom: 0px;" class=""><!--StartFragment-->The support structure of the <span style="text-decoration: underline;" class="">DIRC</span> will allow the pairs of bar boxes to slide vertically out of the active area of the detector for experiments requiring minimal material budget in front of the forward <span style="text-decoration: underline;" class="">calorimeter</span>.<!--EndFragment--></pre>
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<div class="">I think in this sentence "slide vertically" can not be substituted by “swap” here. But I’m not sure.</div>
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<div>I think "swap" is OK. </div>
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<div>Mike</div>
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<div class="">Thank you and have a nice holidays!!</div>
<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="">
<br class="">
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="">
<br class="">
-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="">
<a href="https://mailman.jlab.org/mailman/listinfo/halld-pid-upgrade">https://mailman.jlab.org/mailman/listinfo/halld-pid-upgrade</a><br class="">
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