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||<align="center">'''Parameter'''||'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=30&version=1|Special Working Group Report]].)>>||'''LCGT VRSE-B''' ||units|| ||<align="center">'''Parameter'''||'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/subgroup/ifo/BW|Special Working Group Report]].)>>||'''LCGT VRSE-B''' ||units||
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||PRM mass || Not defined || ||kg||
||SRM mass || Not defined || ||kg||
||BS mass || Not defined || ||kg||
||PRM mass || X-( Not defined || ||kg||
||SRM mass || X-( Not defined || ||kg||
||BS mass || X-( Not defined || ||kg||
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||FM AR ROC || Not defined || ||m||
||PRM ROC || Not defined || ||m||
||SRM ROC || Not defined || ||m||
||FM AR ROC || X-( Not defined || ||m||
||PRM ROC || X-( Not defined || ||m||
||SRM ROC || X-( Not defined || ||m||

..Up

Interferometer Parameters

Old parameter sets (before 2010)

(Classical-noise parameters are here)

Parameter

LCGT VRSE-D1

LCGT VRSE-B

units

Laser source

Wave length

1064

nm

Initial Laser Power

150

W

Injecting Laser Power into IFO

78.48 (in total), 75 (carrier)

W

Modulation depth

0.3 for both

RF freq 1

11.25 (PM)

MHz

RF freq 2

45.00 (PM)

MHz

MC1 length

13.324109

m

MC2 length

13.324109

m

MC1 FSR

MHz

MC2 FSR

MHz

MC1 Finesse

MHz

MC2 Finesse

MHz

Cavity Length

Arm cavity length

3006.69

m

PR cavity length

73.2826

m

PRM-BS length

48.2826

m

BS-FM X length

26.665515

m

BS-FM Y length

23.334485

m

Asymmetry length

3.33103

m

SR cavity length

m

SRM-BS length

m

SRC detuning phase

0.05934 = 3.4 degree

0

rad

Mirror optical properties

EM mass

30

kg

FM mass

30

kg

PRM mass

X-( Not defined

kg

SRM mass

X-( Not defined

kg

BS mass

X-( Not defined

kg

EM ROC

7113.900

m

FM ROC

7113.900

m

FM AR ROC

X-( Not defined

m

PRM ROC

X-( Not defined

m

SRM ROC

X-( Not defined

m

BS ROC

Infinity

m

Mirror optical properties

EM Reflectivity

0.999945

FM Reflectivity

0.996

PRM Reflectivity

0.9

SRM Reflectivity

0.8464 = 0.92^2

BS Reflectivity

0.5

EM Loss

45e-6

FM Loss

45e-6

PRM Loss

45e-6

SRM Loss

45e-6

BS Loss

100e-6

Transmittance

1 - R - Loss

Arm cavity FSR

0.05

0.05

MHz

PRC cavity FSR

19.3166

6.7

MHz

Arm cavity Finesse

1250

1548

777

777

Arm power gain

796

987

Arm power(single)

0.398

0.3859

0.202

0.202

MW

PR gain

10

10.63

11

11

PRC power on BS

1000

797.14

825

825

W

SR gain

10

14.68

?

N/A

Arm cavity cut-off frequency

16.14

31.8

31.8

Hz

PR cavity cut-off frequency

1.209e6

Hz

PR-Arm cut-off frequency

1.189

2.3

2.3

Hz

Signal band

236.9

Hz

MICH contrast

0.995

0.995

Other losses in PRC

Not defined

1e-3

0.02/PRG

0.02/PRG

Other losses in SRC

Not defined

0.02/SRG

0.02/SRG

EM AR Reflectivity

Not defined

1e-3

FM AR Reflectivity

Not defined

1e-3

PRM AR Reflectivity

Not defined

1e-3

SRM AR Reflectivity

Not defined

1e-3

BS AR Reflectivity

Not defined

1e-3

EM AR Loss

Not defined

Not defined

FM AR Loss

Not defined

Not defined

PRM AR Loss

Not defined

Not defined

SRM AR Loss

Not defined

Not defined

BS AR Loss

Not defined

Not defined

EM absorption loss (bulk)

20

20

ppm/cm

FM absorption loss (bulk)

20

20

20

20

ppm/cm

EM absorption loss (coat)

ppm

FM absorption loss (coat)

<1

<1

ppm

PRM absorption loss

5

5

ppm/cm

SRM absorption loss

5

5

ppm/cm

BS absorption loss

5

5

ppm/cm

EM thickness

18

15

15

15

cm

FM thickness

18

15

15

15

cm

PRM thickness

Not defined

Not defined

cm

SRM thickness

Not defined

Not defined

cm

BS thickness

Not defined

Not defined

cm

EM bulk Loss

1000

1000

ppm

FM bulk Loss

1000

1000

ppm

PRM bulk Loss

1000

1000

ppm

SRM bulk Loss

1000

1000

ppm

BS bulk Loss

1000

1000

ppm

OMC input/output mirror reflectivity

0.8

0.8

OMC end mirror reflectivity

0.99995

0.99995

OMC length

0.07

0.07

m

OMC MC FSR

4282

4282

MHz

OMC Finesse

14

14

MHz

Quantum efficiency

0.9

0.9

 

Frequency Stabilization band width

10000

10000

Hz

CARM control band width

Not defined

0.1

Hz

DARM control band width

Not defined

1000

Hz

PRC control band width

Not defined

1000

Hz

MICH control band width

Not defined

10

Hz

SRC control band width

Not defined

1000

Hz

To do list to define parameters for 2009


Reference

Length Sensing Scheme Review by Somiya (Japanese) lcgtrse.pdf

Length Sensing Scheme Review for advLIGO by Somiya AdvLIGO-LSCv4.pdf


LCGT/subgroup/ifo/ISC/IFOParameters (last edited 2011-04-30 00:35:52 by OsamuMiyakawa)