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Hello,</div>
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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.</div>
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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.<br>
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I will also distribute the raw data for all tests this afternoon.</div>
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Best regards,</div>
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Tyler<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Patrizia Rossi <rossi@jlab.org><br>
<b>Sent:</b> Friday, January 10, 2020 8:30 AM<br>
<b>To:</b> Tyler Lemon <tlemon@jlab.org><br>
<b>Cc:</b> William Brooks <william.brooks@usm.cl>; dsg-rich <dsg-rich@jlab.org><br>
<b>Subject:</b> Re: [EXTERNAL] [Dsg-rich] RICH prototype mirror reflectivity summary</font>
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<div class="PlainText">Great thanks!<br>
--------------------------------------------------<br>
# Patrizia Rossi<br>
# Jefferson Lab <br>
# 12000 Jefferson Avenue<br>
# Suite 5<br>
# Newport News VA 23606 (USA)<br>
# e-mail: rossi@jlab.org<br>
# phone: +1 (757) 269 7740<br>
# fax: + 1 (757) 269 5800<br>
# cell: +1 (757) 528 7606<br>
<br>
<br>
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> On 10 Jan 2020, at 14:29, Tyler Lemon <tlemon@jlab.org> wrote:<br>
> <br>
> Hello Dr. Rossi,<br>
> <br>
> 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.<br>
> <br>
> 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.<br>
> <br>
> We'll report back with the findings after the test is complete.<br>
> <br>
> Best regards,<br>
> Tyler<br>
> From: Patrizia Rossi <rossi@jlab.org><br>
> Sent: Thursday, January 9, 2020 9:00 PM<br>
> To: Tyler Lemon <tlemon@jlab.org><br>
> Cc: Amrit Yegneswaran <yeg@jlab.org>; dsg-rich <dsg-rich@jlab.org><br>
> Subject: Fwd: [EXTERNAL] Fwd: [Dsg-rich] RICH prototype mirror reflectivity summary<br>
> <br>
> Hi Tyler,<br>
> <br>
> more appreciation from the chilean group.<br>
> Is it possible to measure longer wavelengths as per their request?<br>
> <br>
> Thanks<br>
> patrizia<br>
> --------------------------------------------------<br>
> # Patrizia Rossi<br>
> # Jefferson Lab <br>
> # 12000 Jefferson Avenue<br>
> # Suite 5<br>
> # Newport News VA 23606 (USA)<br>
> # e-mail: rossi@jlab.org<br>
> # phone: +1 (757) 269 7740<br>
> # fax: + 1 (757) 269 5800<br>
> # cell: +1 (757) 528 7606<br>
> <br>
> <br>
> <br>
> <br>
>> Begin forwarded message:<br>
>> <br>
>> From: William Brooks <william.brooks@usm.cl><br>
>> Subject: [EXTERNAL] Fwd: [Dsg-rich] RICH prototype mirror reflectivity summary<br>
>> Date: 10 January 2020 at 02:45:25 CET<br>
>> To: Patrizia Rossi <rossi@jlab.org><br>
>> <br>
>> 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).<br>
>> <br>
>>> Begin forwarded message:<br>
>>> <br>
>>> From: Pedro Mardones <pmardone@npf.cl><br>
>>> Subject: Re: [Dsg-rich] RICH prototype mirror reflectivity summary<br>
>>> Date: January 9, 2020 at 22:16:14 GMT-3<br>
>>> To: Amelia Bayo <abayo@npf.cl><br>
>>> Cc: William Brooks <william.brooks@usm.cl>, Gabriela Hamilton <gabihamilton@gmail.com><br>
>>> <br>
>>> Good idea Amelia !!<br>
>>> <br>
>>> El jue., 9 ene. 2020 a las 22:11, Amelia Bayo (<abayo@npf.cl>) escribió:<br>
>>> That is pretty good indeed!! Also with little wl dependence from uv to red light :) can they measure longer wavelengths??<br>
>>> Cheers and thanks for the info!!!<br>
>>> Amelia<br>
>>> <br>
>>> Sent from my iPhone<br>
>>> <br>
>>> On Jan 9, 2020, at 10:01 PM, William Brooks <william.brooks@usm.cl> wrote:<br>
>>> <br>
>>>> Dear all, <br>
>>>> <br>
>>>> 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).
<br>
>>>> <br>
>>>> For a first try, I’d say that’s quite good. I think 95% is pretty much the maximum possible.
<br>
>>>> <br>
>>>> Thanks, <br>
>>>> <br>
>>>> - Will<br>
>>>> <br>
>>>> <br>
>>>>> Begin forwarded message:<br>
>>>>> <br>
>>>>> From: Patrizia Rossi <rossi@jlab.org><br>
>>>>> Subject: Fwd: [Dsg-rich] RICH prototype mirror reflectivity summary<br>
>>>>> Date: January 9, 2020 at 18:59:39 GMT-3<br>
>>>>> To: William Brooks <william.brooks@usm.cl><br>
>>>>> <br>
>>>> <br>
>>>> <2019-01-09_prototype-mirror-refl_summary.xlsx><br>
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