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 |