[Clas12_rich] Questions regarding RICH installation document

[Marco Mirazita]

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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