[Halld-pid-upgrade] DIRC meeting tomorrow at 11 am

[Maria Patsyuk]

Hi,

I’m revising the comments on my paper from RICH2016 conference and I’d like to ask your advise/comment on some of them (one of referees is B.Ratcliff).

Going from the cylindrical mirror geometry of FDIRC
to the flat mirror (albeit segmented) geometry of GlueX
does remove the focussing of the FDIRC design
and re-introduces the pin-hole "focussing"
as it was present in the BaBar DIRC.
The mirror segmentation "only" helps to reduce the MaPMT area,
using the vertical shift as described in lines 79-81.

— this comment does not require my action, right?

Figure 3: middle flat mirror (in yellow) - what is the purpose
of this mirror? Given that there is the fused silica to water
transition before, changing photon directions, which renders
the continuation of the 30 degrees top wedge slope pointless.

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.
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)?

2. In the following pic the referee asked to add labels for the DIRC boxes and camera.
[cid:2F7BE04D-2016-4A32-BCF0-B5EABBEB4314]

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.
[cid:ACA1811F-C62B-49F9-98F0-AA3689D00FA9]

4. Comment is “slide vertically - swap” for the sentence:


The support structure of the DIRC 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 calorimeter.


I think in this sentence "slide vertically" can not be substituted by “swap” here. But I’m not sure.


Thank you and have a nice holidays!!
Best regards,
Maria



On Dec 15, 2016, at 12:44 PM, Justin Stevens <jrsteven at jlab.org<mailto:jrsteven at jlab.org>> wrote:

Hi All,

We'll have a DIRC meeting tomorrow at 11 am.  You can find the agenda at https://halldweb.jlab.org/wiki/index.php/December_16,_2016_PID_Upgrade.

-Justin
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