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||<align="center">'''Parameter'''||<align="center":width="10%">'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/subgroup/ifo/BW|Special Working Group Report]].)>>||<align="center":width="10%">'''LCGT VRSE-B''' ||units|| ||<align="center":width="20%">'''Parameter'''||<align="center":width="15%">'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/subgroup/ifo/BW|Special Working Group Report]].)>>||<align="center":width="15%">'''LCGT VRSE-B''' ||units||
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||<bgcolor="#FFFF00":colspan="4"> '''Derivative Parameters''' ||
||Arm cavity Finesse || || || ||
||Arm power gain || || || ||
||Arm power(single) || || ||MW||
||Arm cavity FSR || || ||MHz||
||Arm cavity cut-off frequency || || ||Hz||
||PR gain || || || ||
||PRC power on BS || || ||W||
||PRC cavity FSR || || ||MHz||
||PR cavity cut-off frequency || || ||Hz||
||PR-Arm cut-off frequency || || ||Hz||
||SR gain || || || ||
||Signal band || || ||Hz||
||MICH contrast || || || ||
||Other losses in PRC || || || ||
||Other losses in SRC || || || ||
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||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 || ||
|| || || || || || ||
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||OMC input/output mirror reflectivity || || || ||
||OMC end mirror reflectivity || || || ||
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||OMC Finesse || 2000 || || ||
||OMC input/output mirror reflectivity || X-( To be designed|| || ||
||OMC end mirror reflectivity || X-( To be designed || || ||
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||OMC Finesse || 2000 || ||MHz||
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||Frequency Stabilization band width || 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||		 ||CARM control band width              || 30k || ||Hz||
||DARM control band width              || 200 || ||Hz||
||PRC control band width               || 50 || ||Hz||
||MICH control band width              || 50 || ||Hz||
||SRC control band width               || 50 || ||Hz||
||Feed-Forward gain || -0.97 || || 1/(1-0.97) = 30 ||

..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 geometries or mechanical properties

EM mass

30

kg

FM mass

30

kg

PRM mass

<:( Not defined

kg

SRM mass

<:( Not defined

kg

BS mass

<:( Not defined

kg

EM ROC

7113.900

m

FM ROC

7113.900

m

FM AR ROC

<:( Not defined

m

PRM ROC

<:( Not defined

m

SRM ROC

<:( Not defined

m

BS ROC

Infinity

m

EM thickness

15

cm

FM thickness

15

cm

PRM thickness

<:( Not defined

cm

SRM thickness

<:( Not defined

cm

BS thickness

<:( Not defined

cm

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

HR Coating Loss of EM, FM, PRM and SRM

45e-6

BS Loss

100e-6

Transmissivity

1 - R - Loss

AR Transmissivity

0.999

AR Coating Loss

:-? 1000e-6

Bulk loss (absorption) (large optics: ???FM, EM)

:-? 20

ppm/cm

Bulk loss (absorption) (small optics: ???)

:-? 2.5

ppm/cm

Derivative Parameters

Arm cavity Finesse

Arm power gain

Arm power(single)

MW

Arm cavity FSR

MHz

Arm cavity cut-off frequency

Hz

PR gain

PRC power on BS

W

PRC cavity FSR

MHz

PR cavity cut-off frequency

Hz

PR-Arm cut-off frequency

Hz

SR gain

Signal band

Hz

MICH contrast

Other losses in PRC

Other losses in SRC

Output Mode Cleaner

OMC length

1.5

m

OMC Finesse

2000

OMC input/output mirror reflectivity

X-( To be designed

OMC end mirror reflectivity

X-( To be designed

OMC MC FSR

???

MHz

Control Bandwidth

Quantum efficiency

0.9

　

CARM control band width

30k

Hz

DARM control band width

200

Hz

PRC control band width

50

Hz

MICH control band width

50

Hz

SRC control band width

50

Hz

Feed-Forward gain

-0.97

1/(1-0.97) = 30

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

  1. Special Working Group Report. (1)

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