[Dsg-rich] Temporary dark box for RICH cosmic tests

[Marco Contalbrigo]

Hi Tyler,
the scope is to have soon, around middle of June, a simplified cosmic
stand to develop and validate the full readout/slowcontrol chain. By
that time we will be able to instrument around 32 tiles.

To mimic the RICH working conditions, we can instrument a "ring"
with 30 tiles and use 2 tiles for tracking, one on the panel at
the ring center, one ~1m above. Trigger can be a simple scintillator
plus SiPM, already in use in Ferrara, on top of the above tile.
Just below, we need to place an aerogel brick to generate the
Chrenkov light.

The typical Cherenkov angle is 310 mrad, i.e. 30 cm radius
at 1 m distance. A pipe seems to be the natural easy solution.
We would need a cap with a hold for the aerogel in the
bottom and the tracking tile+aerogel laying on top. As
we do not look for a long-term solution, precarious
wrap/tape/foam can be used to seal the joints and the not
intrumented holes in the electronic panel.

I find a black pipe in Ferrara. Although it is an option, I am
not sure it is worth to prepare such a basic stand in Italy but
have to organize the shipment.

Relevant issues:
- geometry is flexible, i.e. we can go with commercial elements
even if they do not match the ideal dimensions. Of course, the
closer to the RICH, the better test we can perform (i.e. on
resolution).
- the full instrumented panel is of the order of 100 kg. A
pipe of several kg is not an issue for the panel, but can
be an issue for PMT safety as it is not easy to handle.
- material is free, but should sustain the cap (with ~1 kg
for tracking station and aerogel)
- pipe sections (commercial pipes are much longer) should be
regular, to assure pipe stability and light tightness.

I am at disposal if you need to discuss other points.
Best regards, Marco.

On Wed, 31 May 2017, Valery Kubarovsky wrote:

> Hi All,
>
> The thickness of the box is not an issue. We are going to work with cosmic muons. These particles can penetrate even steel wall. It has to be rigid and light-blocking. The light is very -very important.
>
> Regards,
> Valery
>
>
>> On May 31, 2017, at 15:52, balossino at fe.infn.it wrote:
>>
>> Hello Tyler,
>> here the properties of this dark box should be:
>>    ~1 m [~40 in] high;
>>    ~70 cm [~28 in] in diameter;
>>    it has to sustain a 0.5-1kg [1-2.5 lb] weight;
>>    the best would be have it as thinner as possible.
>>
>> I think, but Marco Contalbrigo can confirm, that the most important thing
>> is the light-blocking.
>>
>> Let me know if you need something else.
>>
>> Thanks,
>> Ilaria
>>
>>> Hello Ilaria,
>>>
>>> You mentioned yesterday that Marco proposed we build a temporary dark box
>>> cover to use for cosmic tests of RICH electronics until the actual dark
>>> box cover is delivered to JLab in July 2017. What are the dimensions that
>>> the temporary dark box needs to be?
>>>
>>> It was also mentioned that maybe a large, black PVC pipe could to be used
>>> for the temporary dark box cover. Does the dark box material have to be
>>> PVC, or is the main requirement be that the material should be
>>> light-blocking? Please let us know so we can start looking for the
>>> appropriate materials.
>>>
>>> Best regards,
>>> Tyler
>>>
>>> _______________________________________________
>>> Dsg-rich mailing list
>>> Dsg-rich at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/dsg-rich
>>>
>>
>>
>> _______________________________________________
>> Dsg-rich mailing list
>> Dsg-rich at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/dsg-rich
>
> _______________________________________________
> Dsg-rich mailing list
> Dsg-rich at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-rich
>