[Solid_cc] clas12 LTCC update

[Zhiwen Zhao]

Dear Zein-Eddine

Understood.
We definitely want to push below 200nm on all elements including 
PMT,mirror,reflection cone and gas.

Our expensive mirror is supposed to have quality as good as RICH mirror 
which we won't really need, but the company can't make a mirror with 
lower quality and less cost.
On the other hand, we assume the thin film is a good way for reflection 
cone so far.

Also, there are some reflection data in Mauri's talk I don't quite 
understand yet and need to check with him.

I think it would take sometime for us to find a perfect solution.

Zhiwen

On 8/28/2017 5:06 PM, Zein-Eddine Meziani wrote:
> Zhiwen,
> 
> I would not recommend this solution especially for PVDIS. The 
> reflectivity of the mirrors is quite small at 200nm. To take full 
> advantage of the wavelength shifter coating it would be important to 
> have the reflectivity optimized so that it is still high down to 180 nm.
> The SANE experiment Cherenkov mirrors coated at CERN used in conjunction 
> with quartz 3” tubes had on average 84% down to  180 nm and dropped to 
> 80% at 160nm.
> 
> Z.-E.
>> On Aug 28, 2017, at 1:25 PM, Zhiwen Zhao <zwzhao at jlab.org 
>> <mailto:zwzhao at jlab.org>> wrote:
>>
>> Hi, All
>>
>> Here is an update Mauri gave for CLAS12 LTCC
>> http://clasweb.jlab.org/group_meeting_minutes/Physics/talks_2017/ltcc-8-28.pdf
>>
>> Things are interesting to SoLID LGC and HGC
>> 1. slide 4,5,6 shows nice reflection of thin film as mirror, which 
>> could be a cheap alternative to expensive CFRP mirror
>> 2. slide 13, 03-1.1kg/day leak rate.
>>
>> Zhiwen
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> 
>