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Dissertation
Master thesis and internship[BR]- Master's thesis : Study of a radiative heat exchanger for the E-Test prototype[BR]- Integration internship
Authors: --- --- ---
Year: 2021 Publisher: Liège Université de Liège (ULiège)

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Abstract

The Einstein Telescope is a highly accurate 3rd generation gravitational wave detector. Thanks
to its increased sensitivity, it will be able to observe much more often phenomena so far difficult to detect, such as the fusion of two black holes or will allow the understanding of the Big Bang.
However, the sensitivity of this telescope is such that it is subject to disturbances such as thermal
noise. To avoid this type of disturbance, the measuring instrument, the mirrors of the Einstein
telescope, must be brought to cryogenic temperatures. To meet this technological challenge, a three-dimensional thermal radiator consisting of nested cells could be the solution.
This master thesis will study the structure of this radiator by measuring its capacity to exchange
energy according to its geometry. In this perspective several quantities are measured such as the heat flux, the temperature variation within the structure and many others.
This work makes it possible to decide on the geometric shape of the radiator to be preferred to
optimize the heat exchange. It also incorporates the study of a complementary system using helium to accelerate the cooling.


Book
Present and Future of Gravitational Wave Astronomy
Author:
ISBN: 303655226X 3036552251 Year: 2022 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

The first detection on Earth of a gravitational wave signal from the coalescence of a binary black hole system in 2015 established a new era in astronomy, allowing the scientific community to observe the Universe with a new form of radiation for the first time. More than five years later, many more gravitational wave signals have been detected, including the first binary neutron star coalescence in coincidence with a gamma ray burst and a kilonova observation. The field of gravitational wave astronomy is rapidly evolving, making it difficult to keep up with the pace of new detector designs, discoveries, and astrophysical results. This Special Issue is, therefore, intended as a review of the current status and future directions of the field from the perspective of detector technology, data analysis, and the astrophysical implications of these discoveries. Rather than presenting new results, the articles collected in this issue will serve as a reference and an introduction to the field. This Special Issue will include reviews of the basic properties of gravitational wave signals; the detectors that are currently operating and the main sources of noise that limit their sensitivity; planned upgrades of the detectors in the short and long term; spaceborne detectors; a data analysis of the gravitational wave detector output focusing on the main classes of detected and expected signals; and implications of the current and future discoveries on our understanding of astrophysics and cosmology.

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