Quadruple Suspension Design For Advanced LIGO

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Status of LIGO Data Analysis

Data taking runs First LIGO Science Run S1 (Aug 23-Sep9, 2002) ~100 hrs quadruple coincidence data Data analysis for inspiral, burst, continuous waves and stochastic sources completed. Second LIGO Science Run S2 (Feb 14-Apr 14, 2003) ~300 hrs triple coincidence, ~250 hrs with TAMA,

Searching for Stochastic Gravitational Wave Background

LIGO-G060024-00-D Advanced LIGO zKeep the same facilities, but redesign all subsystems. Improve sensitivity over the whole frequency range. zIncrease laser power in arms. zBetter seismic isolation. Quadruple pendula for each mass zLarger mirrors to suppress thermal noise. zSilica wires to suppress suspension thermal noise.

List of most relevant publications Dr. G. Cagnoli

List of most relevant publications Dr. G. Cagnoli [67] Mode-dependent mechanical losses in disc resonators Cagnoli G., Lorenzini M., Cesarini E., Piergiovanni F

All-Sky Search for Periodic Gravitational Waves in the O1

Advanced LIGO consists of two detectors, one in Hanford, Washington, and the other in Livingston, Louisiana, separated by a ∼3000-km baseline [28]. Each site hosts one 4-km-long interferometer inside a vacuum envelope with the primary interferometer optics suspended by a cascaded, quadruple suspension system in order to

Background with Advanced LIGO and Advanced Virgo Nelson

Advanced LIGO Initial LIGO: 2005-2010. Advanced LIGO commissioned 2010-2015. Increased laser power Sophisticated seismic/vibration suppression Quadruple pendula suspensions Larger mirrors, better suspension material More complex and versatile interferometer configuration. O2, second observing run, started last fall, goes to August.

TEOPS: Groups, Commonality, Activity, Capabilities

Quadruple stage silica ribbons/fibres eg. LIGO AdvLIGO. Catalysis bonding settling time dependence Advanced LIGO Optical and Mechanical Systems GEO 600 and Hannover AEI Prototype Upgrades to existing detector Isolation and Suspension design

PHYSICAL REVIEW D 022003 (2017) Crackling noise in

Advanced LIGO quadruple suspension system, as shown schematicallyinFig.1.Wefocusonthebladesthatsuspend the lowest two stages from the upper intermediate mass (UIM), since there is little vertical attenuation below them. Any noise in the upper stage blades is further attenuated by the additional vertical isolation in the UIM stage.

Update on quadruple suspension design for Advanced LIGO

Design and development of the advanced LIGO monolithic fused silica suspension A V Cumming, A S Bell, L Barsotti et al.-Quadruple suspension design for Advanced LIGO N A Robertson, G Cagnoli, D R M Crooks et al.-Reducing the suspension thermal noise of advanced gravitational wave detectors G D Hammond, A V Cumming, J Hough et al.-Recent citations

Quasi-monolithicmirror suspensionsinground-based

in the design and construction of the long baseline detectors LIGO and Virgo. These both used steel suspension wires (music wire) [21 23]. At this stage, the thermal noise contribution from the wires for the 4km long arms of the LIGO detectors was still below the photon shot noise [13] limits, and a strain sensitivity of 1×10−19/ √

Classical and Quantum Gravity

Update on quadruple suspension design for Advanced LIGO S M Aston et al 2012 Class. Quantum Grav. 29 235004 A complete review of the Advanced LIGO suspension system which is a key element for reaching the design sensitivity. Comment from Editorial Board Photograph of

Update on Suspension Design for Advanced LIGO

our work on developing a quadruple pendulum suspension system incorporating a monolithic silica suspension for Advanced LIGO, and we present results from a pro-totype suspension and from associated experiments aimed at testing some of the aspects of the design. Norna Robertson LIGO - Caltech Date submitted: 08 Jan 2009 Electronic form version 1.4

LSC Instrument Science White Paper 2007 - phys.ufl.edu

Advanced LIGO LIGO- M070102-00-M currently being tested at the LASTI facility at MIT. Controllers for that system and its integration with the quadruple suspension prototype and the HEPI system are a centerpiece for the plans for Advanced LIGO. A pair of the single-stage HAM ISI systems for Advanced LIGO are currently

Advanced LIGO, Advanced VIRGO and KAGRA: Precision

Advanced LIGO, Advanced VIRGO and KAGRA: Precision Measurement for Astronomy Stefan Ballmer Design sensitivity and observation in 2005. LASER test mass (mirror) beamsplitter Quadruple Pendulum Optics Suspension Internal Seismic Isolation Platform

Development of a Crystal Growth Machine

performance to the Advanced detectors In KAGRA, sapphire springs in final suspension stage: Lower vertical bounce mode to ≈15Hz Provide compliance for fibre length variations Motivation for Cold Suspensions aLIGO: 10-19m/ Hz at 10Hz S. Aston et al., Update on quadruple suspension design for aLIGO, Class. Quant. Grav., 235004. 2012 3

E ects of transients in LIGO suspensions on searches for

to reduce thermal noise. Another similar quadruple suspension is hung next to the test mass suspension, so the actuation on lower stages can be done from a similarly isolated reaction chain. Figure 2 gives an overview of the design of the Advanced LIGO quadruple suspensions.


Advanced LIGO Quadruple Suspensions Supervised by Nergis Mavalvala Keisuke Goda PhD 2007 Development of Techniques for Quantum Enhanced Laser Interferometric Gravita-tional Wave Detectors Supervised by Nergis Mavalvala Joseph Betzwieser PhD 2007 Analysis of Spatial Mode Sensitivity of a Gravitational Wave Interferometer and a

P1200040 aLIGO Seismic Isolation - Review of strategy

much more sensitive detector called Advanced LIGO [11]. This new generation required very demanding levels of seismic isolation [12]. The approach chosen for Advanced LIGO was to develop the active platforms and suspensions independently to facilitate the design, construction and commissioning.

Gravitational Wave Searches in the Advanced Detector era

Advanced LIGO expects to beat spin-down limits for ~dozen pulsars (2014 White Paper) August 2013 installation of quadruple suspension in Hanford, Washington. Detection prospects of

Manuscript accepted for proceedings of SPIE Astronomical

600, the German/UK gravitational wave detector. To meet the more stringent noise levels required in Advanced LIGO, the baseline design for the most sensitive optics calls for a quadruple pendulum, whose final stage consists of a 40 kg sapphire mirror suspended on fused silica ribbons to

Science and technology at LIGO - NSF

The second Advanced LIGO run began on November 30, 2016 and is currently in progress. As of March 1, 2017, approx. 34 days (0.093 year) of cumulative coincident data have been taken with L1 and H1, with a scheduled break between December 22, 2016 and January

Advanced VIRGO - msu.ru

the suspension point in 6 d.o.f. It plays a crucial role on the hierarchical control of the suspension (control of tidal strain and drift of any origin up to ̴200 mHz)

and Beyond

Parameter Initial LIGO Advanced LIGO Input Laser Power 10 W (10 kW arm) 180 W (>700 kW arm) Quadruple Pendulum Suspension Final elements All Fused silica 23-May-2017 24 Workshop on Kamioka Underground Physics. Initial LIGO O1 aLIGO Design aLIGO

PHYSICAL REVIEW D 97, 104064 (2018)

mechanical seismic isolation and quadruple pendulum suspension systems. Thermal noise arises in test masses and suspensions and is determined by material properties and beam size. Compared to initial LIGO, advanced LIGO uses a larger beam size. This results in better averaging of beam on a larger surface area which combined with better

arXiv:2005.02531v3 [astro-ph.IM] 2 Sep 2020

Quadruple Pendulum and Actuator Detail Figure 2. Conceptual diagram of the optical con guration of the Advanced LIGO interferometers: dual-recycled, Fabry-P erot Michelson. The X and Y arms are 4-km-long, Fabry-P erot cavities formed by the highly re ective end test

Kavli IPMU-カブリ数物連携宇宙研究機構

Advanced LIGO GOALS SS 200708.3m SO 20to.oS.'5) Advanced Better seismic isolation Higher Better test power masses laser and suspension Test Mass Quadruple Pendulum Suspension Optics Table Interface (Seismic Isolation Syste Damping Controls Hierarchical Global Initial LIGO 01 aLlGO Design aLlGO 102 -23 10 1024 30-May-2017 At Hz, Factor

Author -r

suspension of the interferometer mirrors from the final stage of multiple pendula. In this thesis we characterize the dynamics of a prototype quadruple pendulum system. The figure of merit in evaluating and improving the performance of the quadruple pendulum is the motion of the mirror at frequencies between 1 and 100 Hz.

Status and perspectives of the Gravitational-Wave search

LIGO-G070024-01-W Raab: Status of GW Searches in US with LIGO 13 Some of the technical challenges for design and commissioning Typical Strains < 10-21 at Earth ~ 1 hair s width at 4 light years Understand displacement fluctuations of 4-km arms at the millifermi thlevel (1/1000 of a proton diameter) Control arm lengths to 10-13 meters RMS Detect optical phase changes of ~ 10-10 radians

Advanced Virgo design: Comparison of the Advanced Virgo

1A complete model for the Adv LIGO quadruple pendulum is contained in BENCH. To calculate the AdV suspension thermal noise we have constrained the model to the last stage only by setting the marionette mass to 10000 kg. The results of such an approximation


Design of passive dampers for the high-Q LIGO quadruple suspensions § Presented at the Lincoln Laboratory Advanced Concepts Committee November 2020. Cambridge, Massachusetts Aug. 2018 Present BirdClaw: A Laparoscopic Grasper for Myomectomy Surgery, MechE MIT Design of passive dampers for the high-Q LIGO quadruple suspensions

Gravitational-Waves Detectors and Seismic Noise

Initial LIGO (2005-2010). Keep the same facilities, but redesign all subsystems. Improving sensitivity over the whole frequency range. Increased laser power in arms. Better seismic isolation. Quadruple pendula for each mass Larger mirrors to suppress thermal noise.

Quadruple suspension design for Advanced LIGO

4/4/2020  with LIGO and other members of the LIGO Scientific Collaboration, has been developing the suspension design to meet the requirements for Advanced LIGO. In particular, we are designing a quadruple pendulum suspension for the main mirrors, which is an extension of theGEO design. The key features of the proposed design are as follows.

Advanced LIGO - Institute for Nuclear Theory

Advanced LIGO's Fabry-Perot Michelson Interferometer is a platform for currently Suspension and isolation contribute to attenuation Reduce or eliminate actuation Quadruple pendulum design chosen Fused silica fibers, bonded to test mass Leaf springs (VIRGO origin) for vertical

Advanced LIGO - Miami

Advanced LIGO and the 2nd generation of gravitational waves observatories Giacomo Ciani Design Sensitivity 10-17 10-18-10 20 10 21 10-22 3x10 23 Enhanced LIGO Seismic noise (displacement): Quadruple pendulum (LF cutoff ~10 Hz) 15 Advanced LIGO:

Gravitational Waves: Sources and Detection

moving on to Advanced LIGO. Essential or helpful Suspension Brownian arrived at the design. Sensitivity achieved during S6/VSR1 (2007 to 2010) LIGO: H2. LIGO: L1. LIGO: H1. Virgo. GEO. LIGO, GEO and Virgo share all data to form a global detector

Gravitational Physics: a tour of Precision Measurement

aLIGO Quadruple Suspension The input test masses (ITM) and end test masses (ETM) of Advanced LIGO are suspended via a quadruple pendulum system Seismic isolation: use quadruple pendulum with 3 stages of maraging steel blades for horizontal/vertical isolation


The Advanced American GW detector, named Advanced LIGO, will use a complex system consisting of three stages of seismic isolation systems. The first two stages use active vibration control to reduce the seismic noise at lower frequencies. The last stage is a suspension that is made either of a triple or a quadruple pendulum. The last mass of these

Giles Hammond Institute for Gravitational Research

LIGO Advanced LIGO Monolithic stages by careful design of break-off/attachment points LIGO-G1100434-v2 Q 1 0 ' I Z Z detection band lower loss Frequency (Hz) aLIGO Quadruple Suspension 16 We will look at the QUAD, but same concepts apply for the triples/doubles (except no reaction

The Advanced LIGO photon calibrators

the Advanced LIGO design sensitivity are shown in Fig.1.9 are suspended from cascaded quadruple pendulums and controlledbycontact-freeelectrostaticactuators.11 Calibration of the differential length responses of the interferometers suspension fiberviolin-mode resonances

Gravitational-Wave Antennas of Ground-based

Quadruple pendulum developed for LIGO2. Underground Site Tokyo (NAOJ) Kamioka 220km. LISM (20m Prototype in Kamioka) and TAMA300 Monolithic Suspension Low pendulum thermal noise Design of Advanced LIGO. Current Status and Plan of

Invited Article: CO2 laser production of fused silica

quadruple mirror suspension. The baseline design for Advanced LIGO is a dumbbell design of fiber,35,36 where the diameter of the flexure points is set to cancel thermoelastic noise, while the middle of the fiber is thinned down to reduce the bounce frequency (<10

LIGO & VIRGO Controls Overview

Overall references on the Advanced LIGO and Advanced Virgo detectors: 112004,June 2016. Advanced Virgo Technical Design Report, VIR-0128A-12 Single, double, triple & quadruple pendulum suspensions

Advanced Virgo Advanced LIGO - Université de Paris

Advanced LIGO, Advanced Virgo, GEO-HF, Design of recycling cavities May 25, 2011 23 Cavities close to instability Fewer mirrors More experience with this configuration Fits in the current infrastructure Quadruple suspension

Challenges and opportunities of advanced gravitational

Advanced LIGO Advanced LIGO (aLIGO) is designed for a 10x sensitivity improvement, including better low frequency response. Because the search volume scales as distance cubed, advanced LIGO will have more than 1000 times more sources within its reach. Predictions for

Modeling and Simulation of Seismic Attenuation Systems for

tion detectors like Advanced LIGO the requirements are even more compelling. Since the seismic noise is the dominant low frequency noise source for terrestrial GW detectors, the performance and reliability of seismic attenuation systems

arXiv:1205.5643v1 [gr-qc] 25 May 2012

Figure 1. The Advanced LIGO quadruple suspension systems: Left, 3D CAD representation of the suspensions [4]; Right, location of sensors and actuators within the quadruple suspensions for the top (red dots), upper-intermediate (green) and penultimate

GW150914: The Advanced LIGO Detectors in the Era of First

The Advanced LIGO design sensitivity, as well as a possible future upgrade [13], each test mass is at the bottom of a quadruple pendulum. It provides high isolation above the resonance suspension thermal noise [22], which limits the useful frequencies to 10 Hz and above.