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⇤ ← Revision 103 as of 2010-06-08 11:11:41 →
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Editor: DaisukeTatsumi
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Editor: DaisukeTatsumi
Comment:
Deletions are marked like this. Additions are marked like this.
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||Feed-Forward gain || -0.97 (openloop) || 1/(1-0.97) = 30 (closed loop) || || ||Feed-Forward gain || -0.97 (openloop), 1/(1-0.97) = 30 (closed loop) || || ||

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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

11.25M (PM)

Hz

RF freq 2

45.00M (PM)

Hz

MC1 length

13.324109

m

MC2 length

B) 13.324109

m

MC1 Finesse

X-( TBD

MC2 Finesse

X-( TBD

Parameters of interferometer

Arm cavity Finesse

1550

Arm power gain

X-( 1.1 × 104

Arm power (single arm)2

420.5

kW

Arm cavity cut-off frequency

Hz

PR gain

11

PRC power on BS

W

PR cavity cut-off frequency

Hz

PR-Arm cut-off frequency

Hz

SR gain

11

Signal band

Hz

MICH contrast

Other losses in PRC

Other losses in SRC

Cavity Length

Arm cavity length

3006.69

m

PR cavity length

73.2826

m

Asymmetry length

3.33103

m

BS-FM length

25

m

SR cavity length

73.2826

m

SRC detuning phase

86.5 <:( 3.4 ???

90.0

degree

Mirror geometries

EM mass

30

kg

FM mass

30

kg

PRM mass

<:( TBD

kg

SRM mass

<:( TBD

kg

BS mass

<:( TBD

kg

EM ROC

7113.900

m

FM ROC

7113.900

m

FM AR ROC

<:( TBD

m

PRM ROC

<:( TBD

m

SRM ROC

<:( TBD

m

BS ROC

Infinity

m

EM radius/thickness

25 / 15

cm

FM radius/thickness

25 / 15

cm

PRM radius/thickness

<:( TBD

cm

SRM radius/thickness

<:( TBD

cm

BS radius/thickness

<:( TBD

cm

Mirror optical properties

EM Reflectivity

0.999945

FM Reflectivity

0.996

PRM Reflectivity

0.9

SRM Reflectivity

0.8464 = 0.922

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 ??? for Sapphire: ???FM, EM)

:-? 20

ppm

Bulk loss (absorption) (small optics ??? for Fused Silica: ???)

:-? 2.5

ppm

Output Mode Cleaner

OMC length

1.5

m

OMC Finesse

2000

OMC input/output mirror reflectivity

X-( TBD

OMC end mirror reflectivity

X-( TBD

OMC MC FSR

???

MHz

DC readout phase

134.7

121.8

degree

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 (openloop), 1/(1-0.97) = 30 (closed loop)

To do list to define parameters for 2009

Reference

  1. Band-Width Special Working Group. (1)

  2. Arm power was defined by sum of both arm powers. It should be a stored power of single arm. (2)

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