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| == Designing and implementing a thermal compensation system for the 40m arm cavity == | = Tuning FP modal frequencies using a thermal phase correction feedback system = |
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| The goal is 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. |
== Goal == To compensate for imperfections that arise due to optical inhomogeneities in the arm cavity mirrors by designing and implementing a thermal compensation system. 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. Sources of inhomogeneity : (i) Deviation from mirror specs (ii) Thermal effects due to circulating arm cavity power (iii) Surface roughness 3. Increase or decrease RoC of the ETM to correct for inhomogeneities (choose between the ring-heater design and the VIRGO chrocc design) 4. Desired tuneable range and achievable range 5. Effect of heating at 1064nm and 532nm 6. Best heating profile 7. Practical/hardware limitations in implementing == Modelling using SIS/COMSOL == |
Tuning FP modal frequencies using a thermal phase correction feedback system
Goal
To compensate for imperfections that arise due to optical inhomogeneities in the arm cavity mirrors by designing and implementing a thermal compensation system.
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)
- Sources of inhomogeneity : (i) Deviation from mirror specs (ii) Thermal effects due to circulating arm cavity power (iii) Surface roughness
- Increase or decrease RoC of the ETM to correct for inhomogeneities (choose between the ring-heater design and the VIRGO chrocc design)
- Desired tuneable range and achievable range
- Effect of heating at 1064nm and 532nm
- Best heating profile
- Practical/hardware limitations in implementing