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Beware of warped surfaces: near-unstable cavities for future gravitational wave detectors

Wang, Haoyu (2017)
Ph.D. thesis, University of Birmingham.

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The present thesis focuses on the behaviour of a particular type of Near-Unstable Cavities (NUCs), and their application to the sensitivity enhancement of current and future gravitational wave detectors. Advanced detectors use high power laser beams. A small fraction of the light energy is absorbed by the cavity mirrors and converted into heat. The operation of near-unstable cavities requires high-precision thermal control of the cavity mirrors, and thus a thermal model of the cavity mirror and its surroundings was built and is presented in this thesis. The model aids the development of mitigation strategies of thermal effects on detector sensitivity. Nearunstable cavities have been proposed as an enabling technology for future gravitational wave detectors, as their compact structure and large beam spot can reduce the thermal noise floor of the interferometer. Throughout my Ph.D., I designed and built an experiment to investigate the technical hurdles associated with near-unstable cavities. A near-unstable table-top cavity was built and accurate control achieved through length and alignment control systems. This experiment provides an insight into how far cavity parameters can be pushed towards geometrical instability. The work I carried out will aid the design of future ground-based gravitational wave detectors.

Type of Work:Ph.D. thesis.
Supervisor(s):Freise, Andreas and Mow-Lowry, Conor
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Additional Information:

Publications arising from thesis:

H Wang, C Blair,
M Dovale Alvarez, A Brooks, M F Kasprzack, J Ramette, P M Meyers, S Kaufer, B O'Reilly, C M Mow-Lowry and A Freise. Thermal modelling of Advanced LIGO test masses. Classical and Quantum Gravity, 34(11):115001, 2017

Subjects:QB Astronomy
QC Physics
Institution:University of Birmingham
ID Code:7874
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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