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

[Michael Williams]

Hi,

I also had to miss the meeting today as I was traveling to my folks place.

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?

I don't think the "complication" of the pattern is a big deal really.   What really will matter is how much overlap these is between an image and itself and with other particles'  images.   It's a good idea for John to move towards simulating multi particle final states to see how each design fares and to add in noise.   Now that we're at this point we should also try and quantify in some physics reactions of interest how often there are multiple particles in the DIRC and "where" they are relative to each other.

Also, note that the 3-segment mirror can be adjusted whenever and it'd be possible to use different "curvature" for the inner and outer boxes.   This gives us more freedom to allocate our PMTs to get optimal physics performance.    It should also be much easier to make and to calibrate.

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.

I don't think we'll need anything smaller than 6mm.


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.

Cool.

Cheers,

M


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






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