[Dsg-rich] [EXTERNAL] RICH prototype mirror reflectivity summary

[William Brooks]

Dear Tyler,

Thank you very much!

Best regards,

 - Will


On Jan 10, 2020, at 11:18, Tyler Lemon <tlemon at jlab.org> wrote:


Hello,

We were able to take a few measurements at higher wavelengths (635 nm - 800 nm). The attached Excel file is in the similar format as yesterday.

For the wavelengths tested, the results were similar to yesterday (~85%). I would be cautious to fully believe the data at after ~750nm since that is the area where the monochromator starts to get into ranges that are beyond visual verification.

I will also distribute the raw data for all tests this afternoon.

Best regards,
Tyler
________________________________
From: Patrizia Rossi <rossi at jlab.org>
Sent: Friday, January 10, 2020 8:30 AM
To: Tyler Lemon <tlemon at jlab.org>
Cc: William Brooks <william.brooks at usm.cl>; dsg-rich <dsg-rich at jlab.org>
Subject: Re: [EXTERNAL] [Dsg-rich] RICH prototype mirror reflectivity summary

Great thanks!
--------------------------------------------------
# Patrizia Rossi
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> On 10 Jan 2020, at 14:29, Tyler Lemon <tlemon at jlab.org> wrote:
>
> Hello Dr. Rossi,
>
> It may be possible to test up  to ~775 nm wavelength light. It seems like the mechanical construction of the monochromator (what provides the light of a set wavelength) is the limiting factor.
>
> To be able to say for certain, we will run a test to measure the intensity of the light observed in the test station at those larger wavelengths.
>
> We'll report back with the findings after the test is complete.
>
> Best regards,
> Tyler
> From: Patrizia Rossi <rossi at jlab.org>
> Sent: Thursday, January 9, 2020 9:00 PM
> To: Tyler Lemon <tlemon at jlab.org>
> Cc: Amrit Yegneswaran <yeg at jlab.org>; dsg-rich <dsg-rich at jlab.org>
> Subject: Fwd: [EXTERNAL] Fwd: [Dsg-rich] RICH prototype mirror reflectivity summary
>
> Hi Tyler,
>
> more appreciation from the chilean group.
> Is it possible to measure longer wavelengths as per their request?
>
> Thanks
> patrizia
> --------------------------------------------------
> # Patrizia Rossi
> # Jefferson Lab
> # 12000 Jefferson Avenue
> # Suite 5
> # Newport News VA 23606 (USA)
> # e-mail: rossi at jlab.org
> # phone: +1 (757) 269 7740
> # fax: + 1 (757) 269 5800
> # cell: +1 (757) 528 7606
>
>
>
>
>> Begin forwarded message:
>>
>> From: William Brooks <william.brooks at usm.cl>
>> Subject: [EXTERNAL] Fwd: [Dsg-rich] RICH prototype mirror reflectivity summary
>> Date: 10 January 2020 at 02:45:25 CET
>> To: Patrizia Rossi <rossi at jlab.org>
>>
>> Appreciation from our people, fyi. Gabriela is the person (Physics Masters student) making the shiny deposition, the others are engineer (Pedro) and top manager/ PhD astronomer (Amelia).
>>
>>> Begin forwarded message:
>>>
>>> From: Pedro Mardones <pmardone at npf.cl>
>>> Subject: Re: [Dsg-rich] RICH prototype mirror reflectivity summary
>>> Date: January 9, 2020 at 22:16:14 GMT-3
>>> To: Amelia Bayo <abayo at npf.cl>
>>> Cc: William Brooks <william.brooks at usm.cl>, Gabriela Hamilton <gabihamilton at gmail.com>
>>>
>>> Good idea Amelia  !!
>>>
>>> El jue., 9 ene. 2020 a las 22:11, Amelia Bayo (<abayo at npf.cl>) escribió:
>>> That is pretty good indeed!! Also with little wl dependence from uv to red light :) can they measure longer wavelengths??
>>> Cheers and thanks for the info!!!
>>> Amelia
>>>
>>> Sent from my iPhone
>>>
>>> On Jan 9, 2020, at 10:01 PM, William Brooks <william.brooks at usm.cl> wrote:
>>>
>>>> Dear all,
>>>>
>>>> Jlab measured the mirror today. They found an average of 85% reflectivity. There is a lot more information in the attached file, including wavelength dependence (look at the different tabs in the spreadsheet).
>>>>
>>>> For a first try, I’d say that’s quite good. I think 95% is pretty much the maximum possible.
>>>>
>>>> Thanks,
>>>>
>>>>  - Will
>>>>
>>>>
>>>>> Begin forwarded message:
>>>>>
>>>>> From: Patrizia Rossi <rossi at jlab.org>
>>>>> Subject: Fwd: [Dsg-rich] RICH prototype mirror reflectivity summary
>>>>> Date: January 9, 2020 at 18:59:39 GMT-3
>>>>> To: William Brooks <william.brooks at usm.cl>
>>>>>
>>>>
>>>> <2019-01-09_prototype-mirror-refl_summary.xlsx>

<2019-01-10_prototype-mirror-refl_summary-IR.xlsx>
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