[Clas12_rich] Questions regarding RICH installation document

[Marco Contalbrigo]

Dear Tyler,
let me add a penny. The electronic panel is a complex system,
with many boards, elements and, when in use, cables. I am not
an expert of clean room procedures but I am wondering if we
are free to bring it inside at a later stage with some
"cleaning procedure" (which can not be too effective due to
the mentioned complexity) or would be better to assemble it
inside a clean room from the beginning (my guess). Your
advice is welcome.
Thanks, Marco.

On Mon, 21 Mar 2016, Marco Mirazita wrote:

> Dear Tyler,
> I try to answer below to all your questions, based on my understandings.
> I also updated the spreadsheet with some more number.
>
>
> 1) For the mirror testing, we are going to use two different sources. For the 
> spot size measurement, it is a lamp with an optical fiber attached, to 
> produce a point-like source.
> We will also have a Shack-Hartman sensor with a LED source.
> We don't plan to use a laser.
>
> 2) Roughly speaking, the measurement itself is very simple and fast, we turn 
> on the source to illuminate the mirror, turn off the room light and take an 
> image of the reflected light. The full characterization of one mirror will be 
> made by several measurements taken at different distances from the source and 
> sensor. It may also include a series of many measurements over time to check 
> the stability of the mirror.
> In addition, before starting the measurement, the system must be aligned. 
> This operation might take much more time than the measurements and depends on 
> the final geometry of the setup that we are designing.
>
> 3) The aerogel measurements are made by using a spectrophotometer (for 
> example, a Lambda 650 S PerkinElmer) that measures the transparency as a 
> function of the wavelength. At the moment, our plan is to perform this kind 
> of measurements at the Catholic University in Washington.
> More refined tests are done on a 10% sample of the whole production, shipped 
> by the producer to Ferrara. For these measurements, we use laser source, but 
> for the moment we don't plan to bring this setup to jlab.
>
> 4) The assembly of the electronic panel can start in the EEL-121 (or any 
> other available space, not necessarily a clean room). During the assembly, we 
> need to check the correct functionality of the boards one-by-one, so I think 
> we will need LV, HV, etc, but not the cooling system.
> Once the panel assembly is completed, we want to switch on the whole panel. 
> For this, we need the cooling. We also want to take cosmic data.
> This second part of tests can be done in the EEL-124, as soon as it is 
> available, hopefully in October.
>
> Best regards,
> Marco
>
>
>
> Il 2016-03-17 21:23 Tyler Lemon ha scritto:
>>  Dear Marco,
>>
>>  We have reviewed the installation document that you sent us on
>>  3/9/2016 and have questions regarding its contents. Under the section
>>  called Mirror Testing and Assembly, what type of point source are you
>>  planning to use for the spot size measurement test for the mirrors?
>>  Please let us know what type of point source it is and its power and
>>  frequency, because one: laser training would be required, and two:
>>  depending on the power of the source, interlocks would be needed.
>>
>>  In addition, please let us know the procedures for the testing of the
>>  mirrors and characterization of the aerogel. A detailed procedure will
>>  be helpful in creating the proper safety documentation (B-List)
>>  required for the tests.
>>
>>  Under the section Electronic Installation, it is mentioned that you
>>  require a compressed, clean, and dry air generator with a capacity on
>>  the order of 500 l/min for the cooling tests. If these cooling tests
>>  are to be performed in EEL room 121, the small clean room, we will not
>>  be able to put the air generator in the room due to the air
>>  generator’s size, the amount of noise it would make, and the amount of
>>  heat that it would generate. However, we will be able to provide a fan
>>  that should be able to provide enough forced air cooling for the
>>  tests. The air generator will be available for when the detector moves
>>  to EEL room 124, the big clean room, for assembly.
>>
>>  We have begun compiling a list of the parts to be delivered for the
>>  RICH. I have attached a spreadsheet of all RICH parts, the total
>>  number of each part, how many of each part have already been
>>  delivered, and where the delivered parts are being stored. We have not
>>  been able to fully fill out the spreadsheet due to some
>>  inconsistencies in the documentation on the wiki. Please fill out
>>  anything you are able to that is empty and send the filled out
>>  spreadsheet back.
>>
>>  Thank you very much in advance.
>>
>>  Best Regards,
>>  Tyler
>>
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>