[Halld-pid-upgrade] PID Upgrade Meeting Tomorrow: Friday, August 29 1:30 pm

[Yi Qiang]

Dear John and all,

I will not be able to attend today's meeting. After went through John's 
slides, I have a couple of comments:

1. Please take into account the difference of attenuation of Cherenkov 
photons going different directions in the quartz. Without this, our 
optimization may not be valid for realistic condition.

2. I understand John's argument about flat mirror and three-segmentation 
designs. I simply treat it as the limitation from the readout 
segmentation. Same argument is also true for the choice of water with 
lower refractive index. In contrast with the flat mirror design that 
will clearly increase the needs of readout area, the three-segmentation 
design solves the problem by folding the imagine in three pieces. This 
will clearly make the pattern more complicated. My question to John is, 
can you demonstrate the effectiveness of this design with the present of 
background and other events?

3. If we indeed need smaller readout segmentation, the Hamamatsu H9500 
has 3 mm pixels. The drawbacks are that the cost will be pretty much 
doubled and the PMTs can not be treated as CLAS12's spare units any more.

Nevertheless, nice work John!

BTW, a sample of MCP-PMT from Argonne will arrive soon - in a couple of 
weeks. Carl and I are working on setting up the test stand.

Best regards,
Yi


On 8/28/2014 4:47 PM, Baptiste Guegan wrote:
> Dear all,
>
> We'll have our PID meeting tomorrow at 1:30 pm. If you would like to 
> present or discuss something, let me know and we'll add it to the 
> agenda which will appear here:
> https://halldweb1.jlab.org/wiki/index.php/August_29,_2014_PID_Upgrade
>
> Best
> Baptiste
>
>
>
>
>
> _______________________________________________
> Halld-pid-upgrade mailing list
> Halld-pid-upgrade at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-pid-upgrade

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