@@ -517,6 +517,7 @@ After every simulation which could possibly work for the system, we locked the i
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\label{prclfilter}
\label{prclfilter}
\end{figure}
\end{figure}
\newpage
\section*{Conclusions}
\section*{Conclusions}
This study is promising to provide a significant contribution to the improvement of LIGO LSC signals and the detector stability when it is running in observing mode. The tests at LHO demonstrated that the experiment succeeded in lowering the seismic motion of the platforms by a factor of 3 at low frequencies and that also the DARM signal benefited from it. The simulations have shown that it is possible to reduce the differential motion of the chambers by a factor of 3 in order of magnitude below 0.1 Hz. The test on the Power Recycling Cavity Length highlighted that the signal can be controlled by the ISI according with the software simulations.\\
This study is promising to provide a significant contribution to the improvement of LIGO LSC signals and the detector stability when it is running in observing mode. The tests at LHO demonstrated that the experiment succeeded in lowering the seismic motion of the platforms by a factor of 3 at low frequencies and that also the DARM signal benefited from it. The simulations have shown that it is possible to reduce the differential motion of the chambers by a factor of 3 in order of magnitude below 0.1 Hz. The test on the Power Recycling Cavity Length highlighted that the signal can be controlled by the ISI according with the software simulations.\\
As we saw, the implications go straight to the basics of the instrument: a more stable detector produces a less noisy signal which can last longer into the cavities, assuring a longer observing time and giving the possibility to detect more gravitational waves and in lower ranges of frequency \cite{lantztalk}\cite{jenne}.
As we saw, the implications go straight to the basics of the instrument: a more stable detector produces a less noisy signal which can last longer into the cavities, assuring a longer observing time and giving the possibility to detect more gravitational waves and in lower ranges of frequency \cite{lantztalk}\cite{jenne}.
I confirm that the work presented in this thesis is original and has been entirely carried out by the author, started and completed at the University of Birmingham. The work done in collaboration with other scientific groups and/or abroad has been suitably highlighted.
I confirm that the work presented in this thesis is original and has been entirely carried out by the author, started and completed at the University of Birmingham. The work done in collaboration with other scientific groups and/or abroad has been suitably highlighted throughout the thesis.\\
\noindent
During my second year I collaborated with the Albert Einstein Institute (Hannover) to test a device I designed and built in Birmingham. In the same year, I spent 5 months, between June and November 2019, at LIGO Harford site, working on ideas for improving the stability of the interferometer. This work has been carried on in collaboration with the SEI (SEIsmic) group of Stanford, MIT, Caltech, UoB and LIGO Livingston.
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Chiara Di Fronzo
Chiara Di Fronzo
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\chapter{Acknowledgements}
\chapter{Acknowledgements}
%I am particularly grateful to Dr. Conor Mow-Lowry and the University of Birmingham, for giving me the opportunity and the funding to join the Gravitational waves group and contribute to the development of exciting science. This was also possible thanks to the support of the Royal Astronomical Society and the Institute of Physics, which allowed me to take part to conferences and workshops abroad.\\
%I am particularly grateful to Dr. Conor Mow-Lowry and the University of Birmingham for giving me the opportunity and the funding to join the Gravitational waves group and contribute to the development of exciting science. This was also possible thanks to the support of the Royal Astronomical Society and the Institute of Physics which allowed me to take part to conferences and workshops abroad.\\
%During my stay at LIGO Hanford site, I need to warmly thank Caltech for providing me accommodation and travel: this experience was very important for my studies.\\
%During my stay at LIGO Hanford site, I need to warmly thank Caltech for providing me accommodation and travel: this experience was very important for my studies.\\
%The completion of the work presented in this thesis would not have been possible without the action of the University of Birmingham, which accepted my application for an extension of my studies: the lockdown in 2020 stopped my lab work and the support of the UoB has been crucial to accomplish my project in the best way.\\
%The completion of the work presented in this thesis would not have been possible without the action of the UoB, which accepted my application for an extension of my studies: the lockdown in 2020 stopped my lab work and the support of the UoB has been crucial to accomplish my project in the best way.\\
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%On a personal note, \textit{grazie} Conor for always being supportive, it was important in the hardest times! Grazie, with great respect.\\
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%To my best friend here in the UK: \textit{grazie} Sam for your presence, your help, your effort to endure the enormous emotional baggage of this stubborn Italian one, who wanted to be your friend at all costs. I know it was not easy, I will not forget it.\\
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%\textit{Grazie} to all my PhD colleagues who shared the stress and the fun of this experience with me. Riccardo, thanks for pushing me to go further, do better, stay stronger. George, thank you for the chess \& Czech classes, you opened my mind. Amit, your positivity is always contagious, thank you for sharing it!\\
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%I really need to thank all the people on LIGO Hanford, who made me feel included and part of a great family. \textit{Grazie} Jenny and Jim for your infinite patience, and I was very lucky to meet Dripta, an amazing housemate and friend, thank you for all the time you chose to share with me.\\
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%To my friends in Italy: Vero \& Ludo, Alice \& Anna Paola, Martina, Francesca, Edo \& Nani, \textit{grazie} for your incredible will to stay close to me despite the 2000 km-distance.\\
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%A mio nonno, zio Marco e zia Laura, zia Flora e zio Vincenzo, grazie per avermi riempito di affetto e di cibo, sono stati indispensabili.\\
%Ai miei genitori e a mia sorella, grazie per avermi sempre incoraggiato, ascoltato le mie lamentele e sopportato la distanza durante questi 4 anni cosi' importanti per me.
