|
Size: 1071
Comment:
|
Size: 565
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 4: | Line 4: |
| To compensate for imperfections that arise due to optical inhomogeneities in the arm cavity mirrors by designing and implementing a thermal compensation system. | |
| Line 12: | Line 12: |
| 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) |
2. Desired tuneable range and achievable range |
| Line 16: | Line 14: |
| 4. Desired tuneable range and achievable range | 3. Heaters and heating patterns |
| Line 18: | Line 16: |
| 5. Effect of heating at 1064nm and 532nm 6. Best heating profile 7. Practical/hardware limitations in implementing |
4. Practical/hardware limitations in implementing |
| Line 25: | Line 19: |
| == Modelling using SIS/COMSOL == | == 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