[Clas12_rich] RICH cooling, interlocks and assembly structure

[Marco Mirazita]

Dear George,
thank you very much for this, I like this preliminary scheme, but I would 
like to add some consideration.
We may have a risk of damaging the electronics not only because of failure 
of the cooling system, but also because of failure of the electronics 
itself. For example, few channels may start producing much more heat than 
what is expected in normal conditions, so that the inner temperature may 
increase even under normal operation of the cooling system. So I suggest 
that the power supply interlocks should shut down the system also if the 
temperature exceeds some value.

At the moment, we have a preliminary estimation of what we believe are the 
ideal operating conditions of the system. We have ongoing some more 
studies, but the final values can only be set when we will test the real 
system before installing it inside the RICH.
By the way, is there a rule of thumb to set the interlock limits once we 
have identified the operating conditions? For example, if we want to work 
at a air flow of 200 l/min, what is a reasonable level at which the system 
should be shut down?

Thank,
Marco


On Thu, 5 May 2016, George Jacobs wrote:

> Please find attached pdf file showing the cooling circuit and explaining the 
> associated power supply interlocks.
>
> This is a preliminary diagram since  system min/max operating parameters have 
> yet to be determined.
>
> George
>
> On 5/3/2016 1:09 PM, Tyler Lemon wrote:
>> Dear Marco Mirazita,
>> 
>> We held a short meeting among DSG members to discuss RICH gas and cooling 
>> system, interlock system, and anchoring the assembly structure. We 
>> discussed the following:
>> 
>> Gas and Air Compressor Cooling System:
>> George will create a scheme for the air compressor cooling and send it to 
>> Saptarshi Mandal and Ron Bartek for ASME approval. We will also compile a 
>> list of components to be purchased (e.g. compressors, tanks, fittings) and 
>> the price quote for each component.
>> 
>> Interlock System:
>> We have received Valery’s suggestions on the interlock system and as in my 
>> previous email, please let us know of any other interlocks would be 
>> required. For the hardware interlocks, we will develop a cRIO-based system 
>> identical to the SVT interlock system that Peter developed. There will also 
>> be software interlocks for alarm handling and controls in EPICS. We will 
>> compile a list of all components to be purchased (e.g. cRIO system, 
>> monitoring sensors) and the price quote for each component.
>> 
>> Assembly Structure:
>> To anchor the assembly structure in EEL 124, George informed us that we 
>> will be able to drill holes and anchor the structure to the floor. What 
>> size bolts would be used to anchor the structure? Also, is there an 
>> engineering drawing for the assembly structure that specifies the lift 
>> points for the structure and the bolt size? Please let us know. The drawing 
>> would need to be reviewed by Hall B Engineering because of the bolt size 
>> and each lift will be an engineered list.
>> 
>> Please let us know about the engineering drawings and where we could find 
>> them. Thank you in advance.
>> 
>> Best Regards,
>> Tyler
>> 
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>
> -- 
> George Jacobs
> Jefferson Lab (TJNAF)
> STE 12
> 12000 Jefferson Ave.
> Newport News, VA 23606
>
> (office) 757-269-7115
>
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>
> (email) jacobsg at jlab.org
>
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>
>