[Clas12_rich] RICH cooling, interlocks and assembly structure

[Valery Kubarovsky]

Hello All,

The temperature alarm will beset individually for every sensor.
There is no problem with different temperature levels on the different sensors.
Valery

----- Original Message -----
> From: "Vincenzo Lucherini" <Vincenzo.Lucherini at lnf.infn.it>
> To: "mirazita" <Marco.Mirazita at lnf.infn.it>
> Cc: "clas12 rich" <clas12_rich at jlab.org>, "Bob Miller" <rmiller at jlab.org>, "Saptarshi Mandal" <mandal at jlab.org>
> Sent: Friday, May 6, 2016 8:59:15 AM
> Subject: Re: [Clas12_rich] RICH cooling, interlocks and assembly structure

> Hi George,
> your preliminary scheme is very relevant and useful: thank you for your
> effort.
> Regarding the consideration of Marco (for an interlock also on a
> temperature level), I agree.
> We, however, have to be cautious in the selection of the location of the
> temperature probe providing such information, since inside the volume of
> the electronic panel we measured significant gradients in temperature.
> Hence, it can be that more than one level could be useful to have. We
> have to think more about, but I guess that no more than three (hottest
> point, coldest point, air-exhaust) levels will be needed.
> Vincenzo
> 
> Il 2016-05-06 14:20 Marco Mirazita ha scritto:
>> 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
>>> 
>>> 
>> 
>> _______________________________________________
>> Clas12_rich mailing list
>> Clas12_rich at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/clas12_rich
> _______________________________________________
> Clas12_rich mailing list
> Clas12_rich at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas12_rich