Differences between revisions 1 and 13 (spanning 12 versions)
⇤ ← Revision 1 as of 2009-06-04 11:46:21 →
Size: 34
Editor: KentaroSomiya
Comment:
← Revision 13 as of 2009-06-05 05:30:23 → ⇥
Size: 2686
Editor: KentaroSomiya
Comment:
Deletions are marked like this. Additions are marked like this.
Line 1: Line 1:
'''[[../|..Up]]'''
Line 2: Line 4:

There are some issues to be discussed.

|| Beam radius ||3cm||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue1|issue 1]]||
|| Suspension length ||40cm|| ||
|| Suspension thickness ||1.8mm||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue2|issue 2]]||
|| Number of suspension fiber || 4 || ||
|| Temperature of suspension || 16K || ||
|| Mechanical loss of fiber || 2e-7 || ||
|| Mirror radius ||12.5cm||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue3|issue 3]]||
|| Mirror thickness || 15cm || ||
|| Bulk absorption || 20ppm/cm || [[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue4|issue 4]] ||
|| Coating absorption || 0.1ppm || [[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue4|issue 4]] ||
|| Temperature of mirrors || 20K || ||
|| Mechanical loss of mirror || 1e-8 || ||
|| Number of coatings (ITM) || 9 || ||
|| Number of coatings (ETM) || 18 || ||
|| Mechanical loss of Silica coating || 1e-4 ||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue5|issue 5]]||
|| Mechanical loss of Tantala coating || 4e-4 ||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue5|issue 5]]||
|| Optical loss of each arm || 70ppm/roundtrip ||[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise/issue6|issue 6]]||
|| Optical loss in the SRC || 2% || ||
|| Optical loss at the PD || 10% || ||

== Physical constants ==

|| 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 /K||
|| Specific heat of Sapphire (20K) || 0.69 J/K/kg ||
|| Thermal conductivity of Sapphire (20K) || 1.57e4 W/m ||
|| Thermal expansion of Sapphire (300K) || 5.0e-6 /K||
|| Specific heat of Sapphire (300K) || 790 J/K ||
|| 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 /K||
|| Specific heat per volume of Silica (300K) || 1.64e6 J/K/m^3 ||
|| Thermal conductivity of Silica (300K) || 1.38 W/m ||
|| dn/dT of Silica (300K) || 8e-6 /K ||
|| Young's modulus of Tantala || 1.4e11 Pa ||
|| Poisson ratio of Tantala || 0.23 ||
|| Refraction index of Tantala || 2.07 ||
|| Thermal expansion of Tantala (300K) || 3.6e-7 /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 /K ||

..Up

Classical-Noise parameters

There are some issues to be discussed.

Beam radius

3cm

issue 1

Suspension length

40cm

Suspension thickness

1.8mm

issue 2

Number of suspension fiber

4

Temperature of suspension

16K

Mechanical loss of fiber

2e-7

Mirror radius

12.5cm

issue 3

Mirror thickness

15cm

Bulk absorption

20ppm/cm

issue 4

Coating absorption

0.1ppm

issue 4

Temperature of mirrors

20K

Mechanical loss of mirror

1e-8

Number of coatings (ITM)

9

Number of coatings (ETM)

18

Mechanical loss of Silica coating

1e-4

issue 5

Mechanical loss of Tantala coating

4e-4

issue 5

Optical loss of each arm

70ppm/roundtrip

issue 6

Optical loss in the SRC

2%

Optical loss at the PD

10%

Physical constants

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 /K

Specific heat of Sapphire (20K)

0.69 J/K/kg

Thermal conductivity of Sapphire (20K)

1.57e4 W/m

Thermal expansion of Sapphire (300K)

5.0e-6 /K

Specific heat of Sapphire (300K)

790 J/K

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 /K

Specific heat per volume of Silica (300K)

1.64e6 J/K/m^3

Thermal conductivity of Silica (300K)

1.38 W/m

dn/dT of Silica (300K)

8e-6 /K

Young's modulus of Tantala

1.4e11 Pa

Poisson ratio of Tantala

0.23

Refraction index of Tantala

2.07

Thermal expansion of Tantala (300K)

3.6e-7 /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 /K

LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ClassicalNoise (last edited 2009-06-09 16:20:41 by whitehole)