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Entry  Thu Apr 12 22:00:13 2018, awade, Summary, TempCtrl, Summary of parameters and dimensions for thermal modeling 
    Reply  Fri Sep 6 11:51:17 2019, awade, Summary, TempCtrl, Summary of parameters and dimensions for thermal modeling 
Message ID: 2419     Entry time: Fri Sep 6 11:51:17 2019     In reply to: 2169
Author: awade 
Type: Summary 
Category: TempCtrl 
Subject: Summary of parameters and dimensions for thermal modeling 

There's an error here. The factor of 2 should not be there. Correct equation would be:

\frac{\delta \nu}{\Delta T} = \frac{c\alpha}{\lambda}

as mentioned in the quoted post CTN:1874 as well.

I have added these parameters to this wiki page.

Quote:

This is a summary reference post for parameters to do with the thermal surfaces and bodies within the vacuum can. It brings together drawings and computed dimensions so we can begin to make an actuate physical model of the thermal dynamics of our system.

Design goals

At the center of the experiment are a pair of Fabry-Pérot cavities that need to be thermally stable enough to not drift more than 100 Hz in the time it takes to take a PSD of their relative brownian driven fluctuations.  

\Delta T = \frac{\lambda}{2c\alpha} \delta \nu

https://nodus.ligo.caltech.edu:8081/CTN/1874

Overview

[Insert SW cutaway with ballons]

Cavity parameters 

Refcav parameters
Property Value
Rough dimensions ø38.1mm x 36.83 mm (9.52 mm bore through middle)
Mass 112 g
Heat capacity  82.88 J/K
Outward facing surface area 75.5 cm^2
Emissivity rough fused silica 0.75
Emissivity polished fused silica 0.93
Coefficient of thermal expansion 5.5e-7 1/K
Optical frequency temperature shift @ 1064 nm 310 Hz/µK

Cavity cylindrical heat shields

https://nodus.ligo.caltech.edu:8081/CTN/1737

 

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