1. Vibration Isolation R. Takahashi (ICRR), K. Yamamoto (ICRR), T. Uchiyama (ICRR), T. Sekiguchi (ICRR), H. Ishizaki (NAOJ), A. Takamori (ERI), R. DeSalvo (Univ. of Sannio), E. Majorana (INFN), J. van den Brand (NIKHEF), E. Hennes (NIKHEF), A. Bertolini (AEI/NIKHEF) LCGT Collaboration Meeting (8 November, 2011)

2. Rigid body Model (angular motion of mirror) Room temp. Cryogenic vibration Heat links Monte Carlo simulation within the following asymmetries. Wire length ： ±0.5 mm Wire length ： ±0.5 mm Suspension point ： ±0.5 mm for x, y, z Suspension point ： ±0.5 mm for x, y, z Effective stiffness of the inverted pendulums ： ±50 % Effective stiffness of the inverted pendulums ： ±50 % Anchor point of the heat link ： ±5 cm Anchor point of the heat link ： ±5 cm T. Sekiguchi

3. Angular Fluctuation of Mirror (Type-A) Pitch Yaw Anchor point of heat links, asymmetry in IPs Asymmetry in wire lengths/suspension points T. Sekiguchi

4. Impact to the Sensitivity (Type-A) The effect due to the angular motion is relatively small except some resonance peaks. Pitch resonance peak 1 mm T. Sekiguchi

5. Evaluation of Pre-isolator prototype Measured resonant frequency of Top filter Pre-isolator and Support structure at ICRR

6. Measurement of Top filter Q-measurement using ring-down Amplitude dependence

7. IP basement (hydraulic piston sled) Delivered to ICRR on 10 November

8. Design of Type-B Payload

9. JGW-T1100637 Type-B suspension assembly

10. Schedule 201120122013201420152016 Standard GASFPrototype test in NIKEF & ICRR Procure Assembling Pre-isolatorPrototype test in ICRR Procure Assembling Type-B payloadPrototype test in NAOJ Procure Assembling Installation Type-A SASPrototype test in the site Installation Type-B SASPrototype test in TAMA Installation StackProcure Installation First operation Production schedule 19 Standard GAS filters: 2011FY 11 Pre-isolators: 2012FY 11 Type-B payloads: 2012FY 15 Optical benches: 2011-2012FY

11. Standard GAS filter 19 Box: 0.8 x 0.8 x 0.5 Pre-isolator 11 Box: 1.7 x 1.7 x 1.3 Breadboard 11 Box: 1.2 x 1.2 x 0.3 4 Box: 2 x 2 x 0.5 Clean Booth 2 x 5 x 2.2 Storage & Assembling in Akeno Observatory