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Size: 2819
Comment:
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Size: 2895
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
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| ||Mechanical loss of fiber ||2e-7 || || | ||Mechanical loss of fiber ||2e-7 ||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue8|issue 8]] || |
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| ||Temperature of mirrors ||20K || || ||Mechanical loss of a mirror ||1e-8 ||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue7|issue 7]] || |
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| ||Temperature of mirrors ||20K || || ||Mechanical loss of a mirror ||1e-8 ||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue7|issue 7]] || |
Parameters
There are some issues to be discussed.
Beam radius |
3cm |
|
Suspension length |
40cm |
|
Diameter of suspension fiber |
1.8mm |
|
Number of suspension fiber |
4 |
|
Temperature of suspension |
16K |
|
Mechanical loss of fiber |
2e-7 |
|
Mirror radius |
12.5cm |
|
Mirror thickness |
15cm |
|
Bulk absorption |
20ppm/cm |
|
Coating absorption |
0.1ppm |
|
Temperature of mirrors |
20K |
|
Mechanical loss of a mirror |
1e-8 |
|
Number of coating layers (ITM) |
9 (?) |
|
Number of coating layers (ETM) |
18 (?) |
|
Mechanical loss of Silica coatings |
1e-4 |
|
Mechanical loss of Tantala coatings |
4e-4 |
|
Optical loss of each arm |
70ppm/roundtrip |
|
Optical loss in the SRC |
2% |
|
Optical loss at the PD |
10% |
|
Material properties
Young's modulus of Sapphire |
4e11 |
Pa |
Density of Sapphire |
4e3 |
kg/m^3 |
Poisson ratio of Sapphire |
0.29 |
|
Thermal expansion of Sapphire (20K) |
5.6e-9 |
1/K |
Specific heat of Sapphire (20K) |
0.69 |
J/K/kg |
Thermal conductivity of Sapphire (20K) |
1.57e4 |
W/m/K |
Thermal expansion of Sapphire (300K) |
5.0e-6 |
1/K |
Specific heat of Sapphire (300K) |
790 |
J/K/kg |
Thermal conductivity of Sapphire (300K) |
40 |
W/m/K |
Young's modulus of Silica |
7.2e10 |
Pa |
Poisson ratio of Silica |
0.17 |
|
Refraction index of Silica |
1.45 |
|
Thermal expansion of Silica (300K) |
5.1e-7 |
1/K |
Specific heat per volume of Silica (300K) |
1.64e6 |
J/K/m^3 |
Thermal conductivity of Silica (300K) |
1.38 |
W/m/K |
dn/dT of Silica (300K) |
8e-6 |
1/K |
Young's modulus of Tantala |
1.4e11 |
Pa |
Poisson ratio of Tantala |
0.23 |
|
Refraction index of Tantala |
2.06 |
|
Thermal expansion of Tantala (300K) |
3.6e-7 |
1/K |
Specific heat per volume of Tantala (300K) |
2.1e6 |
J/K/m^3 |
Thermal conductivity of Tantala (300K) |
33 |
W/m/K |
dn/dT of Tantala (300K) |
14e-6 |
1/K |