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Size: 935
Comment:
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Size: 980
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 16: | Line 16: |
| 4. Desired tuneable range and acheivable range | 4. Desired tuneable range and achievable range |
| Line 18: | Line 18: |
| 5. Best heating profile | 5. Effect of heating at 1064nm and 532nm |
| Line 20: | Line 20: |
| 6. Practical/hardware limitations in implementing | 6. Best heating profile 7. Practical/hardware limitations in implementing |
Thermal compensation system for the 40m arm 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
- What are the ideal cavity parameters? (a reference to compare the different corrections brought about by heating the mirror)
- 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
- Desired tuneable range and achievable range
- Effect of heating at 1064nm and 532nm
- Best heating profile
- Practical/hardware limitations in implementing