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

[Tyler Lemon]

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
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# Patrizia Rossi
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Begin forwarded message:

From: William Brooks <william.brooks at usm.cl<mailto: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<mailto: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<mailto: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<mailto:abayo at npf.cl>>
Cc: William Brooks <william.brooks at usm.cl<mailto:william.brooks at usm.cl>>, Gabriela Hamilton <gabihamilton at gmail.com<mailto:gabihamilton at gmail.com>>

Good idea Amelia  !!

El jue., 9 ene. 2020 a las 22:11, Amelia Bayo (<abayo at npf.cl<mailto: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<mailto: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<mailto: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<mailto:william.brooks at usm.cl>>


<2019-01-09_prototype-mirror-refl_summary.xlsx>


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