Conveners
Instrumentation
- Shinji MIYOKI
Instrumentation
- There are no conveners in this block
Description
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Tatsuki Washimi (NAOJ)15/05/2026, 14:30Oral presentation
We present a summary of environmental data measured in the KAGRA underground site during O4c, focusing on the period from June to November 2025. The data include seismic motion, acoustic noise, magnetic field, temperature, humidity, atmospheric pressure, and outside weather information. These measurements provide an overview of the underground environmental conditions relevant to KAGRA...
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Takaaki Yokozawa (ICRR, University of Tokyo, Japan)15/05/2026, 14:50Oral presentation
KAGRA is a kilometer-scale gravitational-wave interferometer located in Japan. It has two unique features: a cryogenic environment and an underground site. KAGRA joined the O4c observing run in July 2026 with a binary neutron star merger range of 7.5 Mpc. In this talk, we present an evaluation of various environmental noise sources affecting the KAGRA detector, with a particular focus on...
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Irene Fiori (European Gravitational Observatory)15/05/2026, 15:10Oral presentation
On behalf of the Virgo Collaboration, we present the main environmental noise studies carried out at Virgo in-preparation, during, and after the O4 observing run. These studies aimed at characterising the interferometer environment and assessing the coupling of external disturbances to detector sensitivity. We focus in particular on the impact of wind, on magnetic and vibro-acoustic noise...
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Maria Concetta Tringali15/05/2026, 15:30Poster
The performance of ground-based gravitational-wave detectors could be affected by environmental noise, particularly in the low-frequency range below 100 Hz. At the Virgo interferometer, infrastructure systems such as heating, ventilation, and air conditioning (HVAC) units represent a significant source of acoustic, seismic, and electromagnetic disturbances. In preparation for the O4 observing...
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Chiaki Hirose (Institute for Cosmic Ray Research, The University of Tokyo)15/05/2026, 16:10Oral presentation
Alignment sensing and control are essential for maintaining the stability of laser interferometric gravitational-wave detectors. Wavefront sensing (WFS) is an effective technique for detecting the misalignment between the cavity axis and the incident beam axis. However, the conventional WFS, which relies on the beat between the carrier and phase-modulated (PM) sidebands, is dominated by arm...
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Marc Eisenmann (NAOJ)15/05/2026, 16:30Oral presentation
KAGRA is the only gravitational wave detector operating with crystalline test-masses at cryogenic temperature. While this allow to reduce the thermal noise of the detector, this comes at the expense of operating with complex test-masses. One issue, is the birefringence of these test-masses that can spoil the detector sensitivity.
In this talk, we will report about the techniques developed...
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Yuheng Ye (The University of Tokyo)15/05/2026, 16:50Oral presentation
Squeezed vacuum injection is one of the key upgrades for improving the high-frequency sensitivity of KAGRA. However, the inhomogeneous birefringence of the sapphire input test masses (ITMs) can limit the achievable squeezing benefit. In this work, we evaluate how the measured ITM birefringence affects squeezed-light operation in KAGRA.
The ITM birefringence couples the fundamental...
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Prof. Ray-Kuang Lee (NTHU)15/05/2026, 17:10Oral presentation
Among various upgrade options, high-frequency (kHz) sensitivity is one of the candidates for KAGRA upgrade. With the cryogenic systems, and there is almost no mysterious noises in high-frequency, the Only limitation is the shot noise. In this talk, I will report the status about vOPO (vacuum optical parametric oscillator) test in NAOJ, with preliminarily 7 dB Squeezing (at 2.5 MHz) and nearly...
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Ardiana Nela on behalf of the Institute for Gravitational Research15/05/2026, 17:30Oral presentation
The Glasgow Cryogenic Interferometer Facility aims to advance cryogenic gravitational-wave detection technologies, informing the development of future observatories such as the Einstein Telescope. The research programme includes the demonstration of fully crystalline cryogenic suspension system, which entails the characterisation of crystalline silicon and sapphire suspension elements,...
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