Status of the KAGRA Project

Takaaki Kajita,for the KAGRA collaboration (~230 members)

ICRR, Univ. of TokyoKajita_at_icrr.u-tokyo.ac.jp

GWPAW2015June, 2015, Osaka

Outline

• Introduction: Overview of KAGRA– Key features– Science examples

• Status of the KAGRA construction (iKAGRA)• Plan toward the cryogenic operation (bKAGRA) • Joining the Global GW network• Summary

KAGRA project 2

KAGRA project 3

Introduction: Overview of KAGRA

10 countries, ~230 members

KAGRA collaboration

KAGRA project 4

Key features of KAGRA

The detector will be constructed underground Kamioka. Reduction of seismic noise (to approximately 1/100).

Very high sensitivity.

Cryogenic mirrors will be used to reduce the thermal noise (in the 2nd phase).

We are here today.

KAGRA project 5

KAGRA surface facility

Super-Kamiokande

Present mine entrance

Toyama airport

40min.by car

LocationMozumi

New Atotsu

We are here today.

KAGRA project 6

Sources of Gravitational Waves1. Coalescence of neutron star binaries2. Coalescence of black hole binaries3. Core collapse of massive stars (Supernova)

(good location; Super-Kamiokande at the same site)4. Rotation of pulsars

Merger

Blackholequasi-normal mode

inspiral

msec

KAGRA project 7

Sensitivities GWIC report (2010)

Ad.-LIGO, Ad-Virgo, KAGRA similar design sensitivities

KAGRA

KAGRA project 8

Expected NS-NS Coalescence signal

8

BH Ringdown (2.8MSun)

Expected signal rate : ~10 / year

KAGRA project 9

Supernova

Example collapse and bounce wave form with 2 different EoSDimmelmeier et al. 2008 [PRD 78, 064056]

Various possible gravitational wave emission mechanism:• Core collapse and bounce• Rotational non-axisymmetric instabilities of proto-neutron star• Post-bounce convection• …

Neutrino (Super-K)

msec

KAGRA project 10

Status of the KAGRA construction(iKAGRA)

KAGRA project 11

Time line (Construction and Observation)

The construction/operation plan is in 2 stages: At the end of 2015, non-cryogenic operation (iKAGRA). Starting operation with cryogenic system in JFY 2017 (bKAGRA). (High sensitivity operation in ?)

2010 2011 2012 2013 2014 2015 2016 2017 2018Calendar yearProject startTunnel excavationiKAGRA

bKAGRA

operation

operationAdv. Optics system and tests

Cryogenic system

Today

KAGRA project 12

iKAGRA and bKAGRAiKAGRA ( ~ 2015) bKAGRA

◆Simple Michelson interferometer with:room temperature operation and2W class laser.

However, full end-to-end (relatively short) observation, in order to experience the operation and to understand the potential problems as soon as possible.

◆ Full bKAGRA with;power and signal recycling, cryogenic sapphire mirrors, and ~180W laser.

KAGRA project 13

iKAGRA on-site schedule (2014-2015) (planed in 2014)

Calendar year 2014 2015

Electricity

Tunnelexcavation

Ventilation

Drain

Crane & Hanging anchor

Dust prevention coating

Clean booth

Network and PHS

Arm tubes

Chambers

Mirror suspension

Input optics

Optical baffles etc

Vacuum pumps

Commissioning

iKAGRAoperation

Physicist-like works

( )

( )

( )

( )

Tunnel excavation

KAGRA project 14

End of April, 2012

Mid June, 2012

New Atotsu entrance

KAGRA project 15

Excavation completed at the end of March 2014

Y-arm

X-arm

Excavation completion ceremony on July 4, 2014.

KAGRA project 16

Status Connection and the

leak tests of 3km X 3km beam tubes have been finished.

Y arm tunnel and vacuum tubes

X arm tunnel and vacuum tubes

KAGRA project 17

Status

All the vacuum tanks located (slightly old photo).

Clean booth construction (planed for JFY2014) finished.

Laser

Y-arm

X-arm

entrance

KAGRA project 18

Underground water and KAGRA tunnel

EXCBS

EYC

X-arm

Y-arm

ITMXITMY

O

EXAhorizontal plane at Y end

horizontal plane at center room

horizontal plane at X end

Y-arm

optical plane of interferometer

X-arm

O (BS)

to lower levelto outsideWater

WaterCenter room

KAGRA project 19

Status (some delay…) • The underground water has

been (much) more than expected, in particular during spring (due to melting snow).

• It has been impossible to install the in-vacuum devises.

• Additional civil-engineering work to minimize the effect of the water during this winter-spring.

• Rescheduling of the installation and commissioning works…

Water proof of the experimental rooms

KAGRA project 20

Walls and the floor of the Center and X and Y end rooms have been coated by plastic. But that was not good enough.

Therefore, plastic sheets were used to cover the roof and wall.

But this is still not perfect. We will have another roof on top of the clean booths soon.

Installation of in-vacuum equipment resumed

21KAGRA project 21

Laser

Y-arm

X-arm

Vacuum tank for Input Mode Cleaner (June 2015)

Testing seismic attenuation system at TAMA

22KAGRA project 22

Seismic Attenuation System(for BS ad SR systems)

Installation of the SAS system into the TAMA vacuum tank (May 2015).

Dummy mirror (Al) in the TAMA tank suspended by the SAS.

KAGRA project 23

iKAGRA Laser system Preparation of the iKAGRA laser (since Nov.

2014). (ISO class 1 achieved and has been kept).

iKAGRA will use low power laser (2W). (180W class laser in bKAGRA) Laser

Y-arm

X-arm

KAGRA project 24

iKAGRA digital system

Computer room at front area in the mine: end of December of 2014

Movement of racks, computers, DC powers: Jan 2015

Network connection: in Feb. Construction of electric panel:

Feb-March

Network for controls and DAQGPS antenna

MozumiEntrance

Entrance to the KAGRA facility

Timing: Synchronization for all RT PC and ADC/DAC

GW buildings at Kamioka

RFM RT control signal: very low latencyDAQ GW data: huge amount, low latency

TCP/IP: EPICS, NFS, network boot

Remote control

Data storage

KAGRA project 25

ICRR @Kashiwa (3PB/5years)

Main Data storage

Low latency analysis Osaka city U., Osaka U. (150TiB/5 years)

Office building

KAGRA project 26

KAGRA office (from Hida-city, since 2012, 140m2)

New office building to be built in 2013. (340m2).

Control room (@office building)

KAGRA project 27

KAGRA project 28

Updated iKAGRA on-site schedule (2015)

Simplified version of the updated schedule by Uchiyama-san will be shown here.

Month in 2015 Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.

Preparation for site worksInput optics commissioningRemaining clean boothsMode cleaner installation and lockVibration isolation installation and commissioningAuxiliary optics (optical lever etc)Commissioning…iKAGRA run

Rescheduled taking the water problem into account…

Still hoping to have the iKAGRA operation in Dec. 2015…

KAGRA project 29

Plan toward the cryogenic operation(bKAGRA)

Cryogenic mirrors and cryostat

KAGRA project 30

4 cryogenic mirrors

Cryo shield

Cryo-cooler

Cryo-payload

Cryo-mirrorCryo-shield tubeRock

2nd floor

~14m

Vibration isolation system (@room temp.)

1st floor

KAGRA project 31

Status of construction: Cryogenic systemFeb. 2013 Cryostat testing at Toshiba Co.

Aug. 2014

2015

All cryostats and the relevant components installed in the KAGRA tunnel.

Status of preparation: Sapphire mirror • 4 Sapphire crystals (C-axis,

22cmφ, 15cm t) have been delivered. (4 more to come).

KAGRA project 32

Surface roughness (test polishing with 200mmφ)

0.24nm r.m.s. over 140mmφ0.48nm r.m.s. over 180mmφ (OK!)

E.Hirose et al., PRD 89, 062003 (2014)

And much more going on…

KAGRA project 33

210 W

Data analysis activities

KAGRA project 34

Compact Binary Coalescence (CBC)• Pipeline development for frequency domain matched filtering (MF)• Low latency analysis (time domain MF) (Osaka CU) : components

preparation.• Bayesian parameter estimation : Basic study with KOREAN group• Alert sending system to EM partners (multi-messenger astronomy)

Burst• Development of single detector search pipeline.• Data Retrieving, Data Conditioning, Event Selection : implemented.• Parameter Estimation : In progress.

Continuous Wave(CW)• Developing codes using the resampling technique.

KAGALI DevelopmentKAGRA data analysis group is developing KAGRA’s data analysis library called KAGra Algorithmic LIbrary or “KAGALI”.

KAGRA project 35

Joining the global GW network

Ad. Virgo

KAGRAAd. LIGO GEO-HF

◆The scientific output will be maximized by the global network.◆KAGRA has to learn various experiences / technologies from the existing interferometers.◆KAGRA will join the worldwide network of gravitational wave detection / astronomy. MOU between LSC/Virgo/KAGRA.

LIGO-India

KAGRA project 36

Importance of Global GW Network: Angular res.

Determination of source sky position: 95%CL, supernova, S/N =10 Wen and Chen, arXiv: 1003:2504

LIGO (L+H) + Virgo

LIGO (L+H) + Virgo+KAGRA

LIGO(L+H)+Virgo

Of course, the addition of LIGO-India will further improve the performance.

KAGRA project 37

Follow-ups/counterparts partners of KAGRA

Fast processing of KAGRA data

Mutually follow-ups with EM and neutrinos

Further scienceon GW data analysis

Grants-in-Aid for Scientific Research “New developments in astrophysics through multi-messenger observations of gravitational wave sources”, PI: T. Nakamura

GW data analysis

Xraymonitor

Optical, RadioNeutrino

theory

Multi-messenger astroUnderstanding GW sources

KAGRA project 38

Summary• KAGRA is a unique GW interferometer with the

underground site and the cryogenic technology.• The underground water during spring is a problem.

Due to this problem, the KAGRA detector construction has been delayed for several months. But, we would like to keep the overall schedule as we initially planed:– Initial operation (iKAGRA) in late 2015. We have to work

really hard!– We plan to start the full cryogenic operation within JFY 2017,

and to play an important role as a member of the global GW network.

• KAGRA would like to contribute to the global network of gravitational wave detection/astronomy.