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
4 October 2011
@ University of Tokyo
Seiji Kawamura (ICRR)
Underground Cryogenic mirrors/
These are essential features for the 3rd GW detectors such as ET.
We are here.
Smaller low-frequency motion of mirror
Lower gain of control system necessary
Lower in-band noise imposed by control system
20m prototype was moved from Tokyo to Kamiokain 1998.
Displacement spectrum m/RHz
Inner Wall (8K)
Platform (14 K)
Upper Mass (15 K)
Mirror (20 K)
Flexible Heat Link
Baffles Thermal Shield
Pulse Tube Cryocooler
Sapphire mirror at 20 K
Tunnel (2nd floor)
(invented by DeSalvo)
Tunnel (1st floor)
SAS was designed based on the Virgo SA.
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.
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.
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.
Systems Engineering Office
(Kawamura, Ando, Miyoki, Somiya)
( Nakatani (PM), Kuroda, Ohashi, Kawamura, Mio, Ando)
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.