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 FabryPérot 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 
5.5e7 1/K 
Optical frequency temperature shift @ 1064 nm 
310 Hz/µK 
Cavity cylindrical heat shields
https://nodus.ligo.caltech.edu:8081/CTN/1737
