[Clas12_rich] RICH air cooling system diagram update and hardware list, review tasks questions

[Marco Contalbrigo]

Dear Tyler,
we are going through your points below.

On Fri, 13 May 2016, Tyler Lemon wrote:

> Dear Marco Contalbrigo and Marco Mirazita,
>
> George has compiled a price list of hardware components that will be required by for the air cooling system. He has also updated the cooling circuit diagram to improve its reliability and also to match the items on the list. The list is attached as an Excel sheet along with a pdf of the diagram. There are items at the bottom of the spreadsheet will be completed once the system is approved by Hall B Engineering. Could you please verify what you can and let us know any information that you have on the cost of the compressors and tank?
>
> Also, we have questions regarding the compressors within the cooling system:
> -Can the compressor operational status be readback?
> -Can the compressors remotely start and stop?
> -Would it be possible to make it so the offline compressor automatically starts up if the other compressor trips off or pressure in the tank falls below a certain value?
>

We will check and let you know as soon as possible about the
compressor controls.

> We have also reviewed the email regarding what you would need for the upcoming review and have questions regarding some items.
>
> -For the two PCs needed, you requested Debian. The supported versions of Linux at JLAB are RHEL 6 (32- or 64-bit) or RHEL 7 (only 64-bit). However, we can get approval to use Debian for the OS if you need it for the testing. Could the computers have the RHEL 6 or RHEL 7 OS or is Debian needed?
>

Is it a support or security issue ?

We do not need support for Debian, as we can install, control and 
maintain it ourself. If we are going with RHEL we may need
external support or additional effort for comaptibility. Hence,
if there is not a specific security issue connected with RHEL, 
we would prefer to go with Debian. Even a RHEL computer with
a free disk partition, where we can install Debian ourself,
would be fine.

> -What type of rack would be needed for storing the mirrors?
>

This has to be defined as soon as we will know how the mirror
will be delivered. We assume to keep the mirror in their
original envelops (as they have high quality) but we do not
know if they come with a usable support or how are the
external boxes. We may endup stacking the boxes, or the mirrors
in their envelops+support. However, we do not expect to need
a cabinet for them, simply a support structure.

> -In the section on aerogel testing, what precision is needed for the scale? Also, what is the maximum weight of the items being weighed?
>

The maximum aerogel tile weight is around 300 grams. To monitor
water absorption we would need a precision of 0.01 grams.

> -In section 3, what is meant by the defining the services?
>

The services are all the equipement needed to perform the
preliminary tests on the electronics panel before final
assembling and on the RICH before installation:
- light tightness;
- cooling;
- humidity control;
- cosmics;
- ......
I consider worth to develop the services as much as possible
similar to the ones we are going to have in the Hall. For the
same reason, it could be worth to use and test the 
interlock already in the clean room.

We should plan who/how develop the interlock and what
should/can be monitored by the slow control.

I consider worth we have a meeting discussing these points.
What about Friday 20th at 9-10 am JLab time (at 10 we have
our weekly RICH meeting) ?

Thanks, Marco.

> Please let us know. Thank you in advance.
>
> Best regards,
> Tyler