vibration isolation r. takahashi (icrr), k. yamamoto (icrr), t. uchiyama (icrr), t. sekiguchi...

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Vibration IsolationVibration Isolation

R. Takahashi (ICRR)R. Takahashi (ICRR), K. Yamamoto , K. Yamamoto (ICRR), (ICRR),

T. Uchiyama (ICRR), T. Sekiguchi (ICRR), T. Uchiyama (ICRR), T. Sekiguchi (ICRR), H. Ishizaki (NAOJ), A. Takamori (ERI), H. Ishizaki (NAOJ), A. Takamori (ERI),

R. DeSalvo (Univ. of Sannio), E. Majorana R. DeSalvo (Univ. of Sannio), E. Majorana (INFN), (INFN),

J. van den Brand (NIKHEF), E. Hennes J. van den Brand (NIKHEF), E. Hennes (NIKHEF), (NIKHEF),

A. Bertolini (AEI/NIKHEF)A. Bertolini (AEI/NIKHEF)

LCGT Collaboration Meeting(8 November, 2011)

Rigid body ModelRigid body Model(angular motion of (angular motion of

mirror)mirror)

Room temp.

Cryogenic

vibration

Heat links

Monte Carlo simulation within the following asymmetries.Monte Carlo simulation within the following asymmetries. Wire lengthWire length :: ±0.5 mm±0.5 mm Suspension pointSuspension point :: ±0.5 mm ±0.5 mm for x, y, zfor x, y, z Effective stiffness of the inverted pendulumsEffective stiffness of the inverted pendulums :: ±50 %±50 % Anchor point of the heat linkAnchor point of the heat link :: ±5 cm±5 cm

T. Sekiguchi

Angular Fluctuation of Mirror Angular Fluctuation of Mirror (Type-A)(Type-A)

Pitch

Yaw

Anchor point of heat links, asymmetry in IPs

Asymmetry in wire lengths/suspension points

T. Sekiguchi

Impact to the Sensitivity (Type-Impact to the Sensitivity (Type-A)A)

The effect due to the angular motion is relatively small except some resonance peaks.

Pitch resonance peak

1 mm

T. Sekiguchi

Evaluation of Pre-isolator prototype

Measured resonant frequency of Top filter

Pre-isolator and Support structure at ICRR

Measurement of Top filter

Q-measurement using ring-down Amplitude dependence

IP basement (hydraulic piston sled)

Delivered to ICRR on 10 November

Design of Type-B Payload

JGW-T1100637

Type-B suspension assembly

Schedule    2011 2012 2013 2014 2015 2016  

Standard GASF Prototype test                                                 in NIKEF & ICRR

  Procure                                                    Assembling                                                  Pre-isolator Prototype test                                                 in ICRR  Procure                                                    Assembling                                                  Type-B payload

Prototype test                                                 in NAOJ

  Procure                                                    Assembling                                                    Installation                                                  Type-A SAS Prototype test                                                 in the site  Installation                                                  Type-B SAS Prototype test                                                 in TAMA  Installation                                                  Stack Procure                                                    Installation                                                  

First operation

Production schedule•19 Standard GAS filters: 2011FY•11 Pre-isolators: 2012FY•11 Type-B payloads: 2012FY•15 Optical benches: 2011-2012FY

Standard GAS filter19 Box: 0.8 x 0.8 x 0.5

Pre-isolator11 Box: 1.7 x 1.7 x 1.3

Breadboard11 Box: 1.2 x 1.2 x 0.34 Box: 2 x 2 x 0.5

Clean Booth2 x 5 x 2.2

Storage & Assembling in Akeno Storage & Assembling in Akeno ObservatoryObservatory

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