Thesis
Aligo commissioning and detector characterization at the Hanford site
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/106277
Abstract
This work describes the efforts to mitigate the effect of noise in gravitational wave interferometers (GW IFOs). The research in this direction has been focused on how to keep the IFO active or "in lock", sensitive to GW astronomical sources, and closer to stationary in noise. Different feedback control loops keep the IFO in lock through the use of electronic servomechanisms. Software monitors of these loops can help reveal noise sources, and preliminary investigations using these monitors show that the auxiliary control loops can become unstable before the main control loops break. The percentage of time that a detector is up and collecting data is known as the duty factor. Cataloguing the times that an IFO is thrown out of lock and then searching through properly filtered data channels at those times, trucks, winds, earthquakes, and instrumental glitches are identified as causes of detector lock loss. The one arm test at LIGO Hanford provided some data on the Advanced LIGO suspensions and length spectrum noise. The infrared laser reference was an important piece of the single arm test by providing some laser noise stability for the arm locking system. The quadruple pendulum suspensions are designed to give higher seismic isolation than iLIGO single pendula. Testing of these quad suspensions shows that the lower stage OSEM sensors cannot provide diagnostic information due to misalignment in the sensors. Studies of the OSEM sensors characterize the low frequency performance of the advanced LIGO suspensions
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Details
- Title
- Aligo commissioning and detector characterization at the Hanford site
- Creators
- Szymon Steplewski
- Contributors
- Sukanta Bose (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525114201842
- Language
- English
- Resource Type
- Thesis