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Sapphire mirror suspended by sapphire fibers Key component of KAGRA(a)Sapphire fiber with nail head : Quality check is in progress (support by ELiTES)

(b)Drilled prototype sapphire bulk will be delivered soon (Shinkosha).

(c)Frame for suspension : Large parts were delivered.

KAGRA Baffle system

LSC meeting xxx 3

Example of a large baffle

400 mm radius

Surface: electro-chemical buffed (ECB)

#3 Narrow-angle baffleMaterial: A5052

Blackened surface: Solblack

ECB: low scatteringSolblack: Vacuum Compatibility (10-7 Pa), Cryogenic compatibility (<8K), Low reflectivity (~2%@1064nm), Applicable for a large work

Vacuum System

Vacuum chamber on the surface plateSurface of the vacuum components after ECB

Vacuum chamber on the machining bed

5

KAGRA Laser system

Requirements for the laser • Power > 180 W• Single frequency• Linear polarization• Single transverse mode• Wide-band control for stabilization systems

• About 1MHz for frequency control• About 100kHz for intensity control

Mitsubishi laser modules

Fiber laser amplifiers

NPRO(500mW)

40 W

40 W

80 W

200 W

Schematic view of the laser systemNPRO-> Fiber amplifiers-> Solid state amplifiers

Current statusCoherent addition of two laser outputs

Fiber amplifiers40W x2 (Nufern)

Result of the coherent addition

Bright port 78W Dark port 4W

41W×2 =>78W Efficiency 95％

Data analysis

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Data Analysis Subsystem(Leader: H.Tagoshi, sub-leaders: Y.Itoh, H.Takahashi)Current members: 16 people + Korean subgroup (Leader: Hyung Won Lee, 3 people)

Current activities: Writing the data analysis white paper Development of data analysis package for KAGRA We have determined the name of data analysis library

for KAGRA. "KAGALI": KAGRA Algorithmic Library 篝

KAGALI is Japanese word and it means frame for fire using search and discovery.

CDS development for KAGRA

Real Time PCGentoo + RT patch

IO chassis

Server switch

IO chassis

Master PC

RT front-end 1

RT front-end 2

Timing master

GE’s RFMDolphin’s RFM

10Gb DAQ router

Server racks forRT control

Client WSs

CentOS 5.2+Wind River

ADC/DAC in IO Chassis

Anti Imaging filtersAnti Alias filters

Real time PC

DTT

Dataviewer

MEDM

First test in CLIO (2009~)

Standalone testfor local control(2010~)

Reflective memory test(2011~)

AA/AI filterClient WS

Large scale setupfor KAGRA(2012~)

Control ON

Summary• KAGRA is a unique GW interferometer with the underground site and the cryogenics　 technology.• The KAGRA construction is in progress.• Initial operation (iKAGRA) will start in late 2015.• Cryogenic system for the (bKAGRA) is also in progress.• Full cryogenic operation will starts in 2017.• Observation in the global network since 2018• KAGRA has close collaborations with LIGO/LSC and

EGO/Virgo.

GWADW 2014 in Japan

KAGRATokyo

NagoyaKAGRA site tour will be scheduled.

Date: 2014.5.26-5.30 (reception on 5.25)Location: Takayama (~3hrs from Nagoya)

Conference will be held in the Hida Hotel Plaza.

Takayama Shirakawago (world heritage)