GWADW2021 Gravitational Wave Advanced Detector Workshop

Session

Low frequency workshop

LowFrequency

18 May 2021, 06:00

remote

Conveners

Low frequency workshop: Hours 1-2

• Conor Mow-Lowry (University of Birmingham)
• Masaki Ando (Department of Physics, Univ. of Tokyo)

Low frequency workshop: Hour 3

• There are no conveners in this block

Low frequency workshop: Hour 4

• Conor Mow-Lowry (University of Birmingham)
• Masaki Ando (Department of Physics, Univ. of Tokyo)

Presentation materials

Recorded workshop

15. Newtonian-noise cancellation

Jan Harms (GSGC)

18/05/2021, 06:00

Low frequency workshop

talk

Gravitational fluctuations produced by the environment of a GW detector lead to so-called Newtonian noise. It is a weak contribution to instrument noise at low frequencies, but as soon as it starts to limit the sensitivity of a detector, it will be very challenging to mitigate it. A Newtonian-noise cancellation system is under development for the Virgo detector for the upcoming science runs....

46. Development Update for the TorPeDO Experiment - A Newtonian Noise Sensor for 3G Observatories

Nathan Holland (ANU Centre for Gravitational Astrophysics, The Australian National University, Canberra, Australia)

18/05/2021, 06:25

Low frequency workshop

talk

Third generation gravitational-wave observatories extend their detection bands down to several Hertz. Enhancing sensitivity in this frequency regime will uncover higher mass black hole binaries, and provide earlier identification of multi-messenger astronomy events. Reaching astronomically relevant sensitivities, at these frequencies, requires overcoming technical and fundamental noise...

55. The Current Status of TOBA

Satoru Takano (The University of Tokyo)

18/05/2021, 06:45

Low frequency workshop

talk

Torsion-bar antenna (TOBA) is a ground-based gravity gradiometer proposed for measurement of gravity gradient fluctuations such as gravitational waves and gravity gradient noise. TOBA consists of two perpendicular torsion pendulum, and the low mechanical resonant frequency of torsion pendulums enables us to measure gravity gradient of frequencies around 0.1 Hz. TOBA aims to achieve the...

161. Low-frequency ground deformation observed by the geophysics interferometer (GIF) in the KAGRA tunnel

Prof. Akito Araya (Earthquake Research Institute, the University of Tokyo)

18/05/2021, 07:05

Low frequency workshop

talk

A laser strainmeter measures deformation of the ground by sensing distance between two separated points based on the optical interferometer with reference to wavelength of light. To monitor accurate ground deformations and broadband ground motions, a long-baseline laser strainmeter (geophysics interferometer, GIF) was constructed in the KAGRA tunnel and it has been in operation since then.

17. Update on Cryogenic Silicon Suspension Activities at Glasgow

Graeme Eddolls (University of Glasgow)

18/05/2021, 07:25

Low frequency workshop

talk

With the need to move to 3rd generation cryogenically cooled detectors, work is ongoing at Glasgow to investigate design, bonding and characterisation of silicon suspensions operating at cryogenic temperatures. Here we present an update on these activities, including details of initial cooling experiments conducted on a silicon ribbon suspending a 1kg mass.

137. Low-Frequency Noise in ET, How can we improve by a factor of a million at 3 Hz?

Katherine Dooley (Cardiff University), Conor Mow-Lowry (University of Birmingham)

19/05/2021, 23:00

Low frequency workshop

talk

The science goals of ET rely on achieving astrophysically interesting sensitivity below 5Hz. This presents an enormous technical challenge, and it was a major focus of the recent ET Instrument Science Board workshop. The question is broken down into several parts: we looked at the key noise-drivers in current detectors and attempt to identify strategies to mitigate them by design in ET. This...

106. Potential Steps to Improve the Low Frequency Performance of Advanced LIGO

Brian Lantz (Stanford Univ.)

19/05/2021, 23:25

Low frequency workshop

talk

On April 6 & 7, 2021, the LSC held a workshop focused on the low frequency (<30 Hz) performance of the Advanced LIGO detectors, the sources of the excess noise, and various approaches to improve the noise. In this talk, I will review a few key points which were presented and then discuss the recommendations which were made in the Workshop Report, L2100055.

33. Closing a loop between ISC and SEI

Lee McCuller

19/05/2021, 23:45

Low frequency workshop

talk

This talk is to explore the complex link relating low frequency seismic performance and control noise contamination of the primary interferometer signals. Past requirements relating these systems were done using bespoke interferometer and controls models, which have not necessarily translated to the implementations actually used and have certainly not translated into auxiliary controls noises...

162. Requirements computation for the Low Frequency third generation gravitational wave detector

Julia Casanueva Diaz (EGO)

20/05/2021, 00:10

Low frequency workshop

talk

The third generation GW detectors has to provide an unprecedented sensitivity, this requires a careful study on all the intereferometer defects that could spoil its performance. For this reason in order to face this challenge, one of the starting points is to establish the RMS requirements that will allow reaching the target sensitivity. This work is focused on the requirements referring to...

163. Low frequency workshop discussion

20/05/2021, 00:30

Low frequency workshop

talk