Output Mode-cleaner

Meetings

Installation work

Reports

Requirement

Shot noise increase due to the signal reduction by the OMC and residual spatial higher order modes after the OMC should be less than 5%.

Optical Design (updated 19/8/11)

item

RoC

Beam Raidus

Misc

OMMT1

13.16m

4.46mm

Dia: 99.95mm, thick: 55.58(largest), wedge: 2.45deg (measured by Hirose-san 2018)

OMMT2

44.39m

2.68mm

Dia: 99.97mm, thick: 55.08(largest), wedge: 3.3deg (measured by Hirose-san 2018)

OSTM

flat

TBA

OMC1

flat

444um

OMC2

flat

444um(X)/447um(Y)

OMC3

1.80m

604um

OMC4

1.80m

604um

DCPD

--

592um

Space

Distance

AOI

SRM-OMMT1

5.63m

3.07deg

OMMT1-OMMT2

2.60m

3.07deg

OMMT2-OSTM

2.97m

90deg

OSTM-OBS1

0.30m

90deg

OBS1-OMC1

0.03m

0.078deg

OMC1-OMC2

0.357m

3.00deg

OMC2-OMC3

0.359m

3.00deg

OMC3-OMC4

0.357m

3.00deg

OMC4-OMC1

0.359m

3.00deg

Suspension Design

Total mass to be suspended

13kg

Number of suspensions

3

Blade spring size

220mm x 53mm

Radius of curvature

190mm

Distance from a blade end to a suspension wire

203.5mm

Blade material

MAS-1

Blade mass

4.3kg

Control Scheme

LSC

Dither frequency

1kHz (tentative)

Dither optics

OMC3 or OMC4

Signal extraction port

OMC trans DCPDs

ASC

Dither frequency

not yet decided

Dither optics

OSTM (tentative)

Signal extraction port

OMC trans DCPDs; on-board QPDs are used for the course alignment

KAGRA/Subgroups/IOO/OMC (last edited 2019-08-11 16:33:14 by KentaroSomiya)