[Clas12_rich] RICH cooling, interlocks and assembly structure

[George Jacobs]

What I have presented are only the cooling circuit interlocks for the 
power supplies.

But yes, other interlocks, such as temperatures inside the enclosure, 
exhaust air temperature, electronics component temps, PS channel current 
limits, etc. must also be addressed. Those would be for the electronics 
package designers and engineers to determine.

As for choosing interlock set points, we can choose initial cooling flow 
and pressure limits and perform tests to check their validity. We do not 
want to choose too strict of limits that cause the power supplies to 
trip off unnecessarily. But, we also want to insure the limits prevent 
any issues due to excessive temperatures. It's a balancing act of sorts.

George

On 5/6/2016 8:20 AM, Marco Mirazita wrote:
> 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
>>>
>>> _______________________________________________
>>> Clas12_rich mailing list
>>> Clas12_rich at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/clas12_rich
>>
>> -- 
>> George Jacobs
>> Jefferson Lab (TJNAF)
>> STE 12
>> 12000 Jefferson Ave.
>> Newport News, VA 23606
>>
>> (office) 757-269-7115
>>
>> (cell)   757-876-0480
>>
>> (email) jacobsg at jlab.org
>>
>> (website) https://userweb.jlab.org/~jacobsg
>>
>>

-- 
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606

(office) 757-269-7115

(cell)   757-876-0480

(email) jacobsg at jlab.org

(website) https://userweb.jlab.org/~jacobsg