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LCGT Project Status. EGO-ICRR Meeting 4 October 2011 @ University of Tokyo Seiji Kawamura (ICRR). Objectives of LCGT. Detect gravitational waves together with Virgo and LIGO for the first time Establish Gravitational W ave Astronomy

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lcgt project status

LCGT Project Status

EGO-ICRR Meeting

4 October 2011

@ University of Tokyo

Seiji Kawamura (ICRR)

objectives of lcgt
Objectives of LCGT
  • Detect gravitational waves together with Virgo and LIGO for the first time
  • Establish Gravitational Wave Astronomy
  • Establish multi-messenger observations between GWs and Electromagnetic waves/Cosmic rays
expected gw sources
Expected GW sources
  • Neutron star binary coalescence
    • correlation with GRB
  • Black hole binary coalescence
  • Black hole ringdown
  • Supernovae
    • Correlation with Neutrino
  • Pulsar
  • Early universe
  • Unknown
key features of lcgt
Key Features of LCGT

Underground Cryogenic mirrors/


These are essential features for the 3rd GW detectors such as ET.


Underground Site

We are here.

advantage of underground site
Advantage of Underground Site
  • Not only linear effect
  • But also nonlinear effect

Smaller low-frequency motion of mirror

 Lower gain of control system necessary

 Lower in-band noise imposed by control system

sensitivity comparison
Sensitivity Comparison

20m prototype was moved from Tokyo to Kamiokain 1998.

@ Tokyo

Displacement spectrum m/RHz

@ Kamioka


cryogenics system
Cryogenics System

Inner Wall (8K)

Platform (14 K)

Upper Mass (15 K)

Mirror (20 K)

Flexible Heat Link

Baffles Thermal Shield

Pulse Tube Cryocooler

sapphire mirror
Sapphire Mirror

Sapphire mirror at 20 K

  • Transparent at 1064 nm
  • Low thermal noise
    • High Quality factor at 20 K
  • Low thermoelastic noise
    • High thermal conductivity at 20 K
    • Low thermal expansion coefficient at 20 K
seismic attenuation system sas for lcgt
Seismic Attenuation System (SAS) for LCGT

Tunnel (2nd floor)


Inverted Pendulum

GAS Filter

(invented by DeSalvo)

Tunnel (1st floor)



SAS was designed based on the Virgo SA.

external review
External Review
  • Feb. 28 – Mar. 4, 2011 @ICRR
  • Almost all the subsystems were reviewed
  • Review items:
    • Requirements
    • Design
    • Schedule
    • Prototype test plan
    • Etc.
  • We obtained report on March 10, 2011
  • 12 pages
  • Consists of:
    • Executive summary
    • Recommendations to management
    • Recommendations to each subsystem
executive summary 1
Executive Summary 1

focusing interferometer noise optimization (and corresponding astrophysics goals) to capitalize on the unique advantages of the underground site and cryogenic operation

Bandwidth working group (led by K. Somiya) was convened to discuss this. It turned out that shifting the frequency band lower will not gain significant advantages.

executive summary 2
Executive Summary 2

establishing a strong Systems group to insure subsystem interfaces and design goals are properly distributed, and sufficient, but not excessive

Systems Engineering Office has been created.

executive summary 4 5
Executive Summary 4 & 5

wherever feasible, employing (or at least starting with) established, tested component designs requiring minimal modification;

proceeding rapidly toward integrated system testing (e.g., through enhanced scope for the iLCGT phase) to minimize the risk of late surprises

Roadmap working group (led by M. Ando) was convened to discuss this. We decided to employ a simple isolation system for iLCGTand meanwhile to develop SAS at the site.

program advisory board
Program Advisory Board
  • Jun. 21 – 22, 2011 @ICRR
  • Review items:
    • Management
    • Schedule
    • Design
    • Etc.
  • We obtained report on August 30, 2011
  • 6 pages
  • Consists of responses to the following points:
    • If the management and organization of the project are OK.
    • If the construction status & plan are OK.
    • If the scientific goals are reasonable.
    • What should be improved in the LCGT construction?
    • Whatever the advice for this project.
  • Actions:
    • We have started discussing possible actions to the report.
schedule of lcgt
Schedule of LCGT











organization of lcgt
Organization of LCGT

LCGT Council




Advisory Board

Systems Engineering Office

(Kawamura, Ando, Miyoki, Somiya)

Executive Committee

( Nakatani (PM), Kuroda, Ohashi, Kawamura, Mio, Ando)

Executive Support

DATA Analysis




Vibration isolation



Main interferometer

Digital system

Analog Electronics

Input/Output Optics


Auxiliary optics

Geophysics Interferometer


joining the worldwide gw network
Joining the worldwide GW network


Advanced LIGO


Advanced Virgo

LCGT will join the world network of gravitational wave detectors, with full reciprocal sharing of data with the Virgo collaboration, the LIGO Collaboration and the GEO600 Collaboration at a time determined by mutual agreement of all parties - LCGT, Virgo, LIGO, and GEO.

lcgt in network



L/H+L/L+V 50%

LCGT in network
  • LIGO(H)+LIGO(L)+Virgo+LCGT
  • Max sensitivity (M.S.): +13%
  • Coverage at 0.5 M.S.: 100%
  • 3 detector duty cycle: 82%
  • LIGO(H)+LIGO(L)+Virgo
  • Coverage at 0.5 M.S.: 72%
  • 3 detector duty cycle: 51%

B. F. Schutz