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| === Designing and implementing a thermal compensation system for the 40m arm cavity === | = Tuning Fabry-Perot cavity modal frequencies using controlled thermoelastic deformations on mirror surface = |
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| To compensate for imperfections that arise due to optical inhomogeneities in the arm cavity mirrors by heating the ETM. The lessons learned from this exercise will help with designing/implementing a similar kind of system for the folding mirrors in the power recycling cavity. |
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| == Things to be looked into == = What are the ideal cavity parameters? = = Thermal effects due to circulating arm cavity power = = HOM degeneracy = = Increase or decrease RoC of the ETM to correct for inhomogeneities (also by how much) = |
The lessons learned from this exercise will help in designing/implementing a similar kind of system for the folding mirrors in the recycling cavities. == Fact-finding == 1. What are the ideal cavity parameters? (a reference to compare the different heating models) 2. Desired tuneable range and achievable range 3. Heaters and heating patterns 4. Practical/hardware limitations in implementing == Outline == |
Tuning Fabry-Perot cavity modal frequencies using controlled thermoelastic deformations on mirror surface
Goal
The lessons learned from this exercise will help in designing/implementing a similar kind of system for the folding mirrors in the recycling cavities.
Fact-finding
- What are the ideal cavity parameters? (a reference to compare the different heating models)
- Desired tuneable range and achievable range
- Heaters and heating patterns
- Practical/hardware limitations in implementing