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研究生： 朱昱光
Chu, Yu-Kuang
論文名稱： Development of KAGRA Photon Calibrator for Hardware Injection Test
Development of KAGRA Photon Calibrator for Hardware Injection Test
指導教授： 李沃龍
Lee, Wo-Lung
學位類別： 碩士
Master
系所名稱： 物理學系
Department of Physics
論文出版年： 2018
畢業學年度： 107
語文別： 英文
論文頁數： 45
中文關鍵詞： Photon Calibrator 、Hardware Injection Test 、Gravitational Waves 、KAGRA
英文關鍵詞： Photon Calibrator, Hardware Injection Test, Gravitational Waves, KAGRA
DOI URL： http://doi.org/10.6345/THE.NTNU.DP.022.2018.B04
論文種類： 學術論文
相關次數： 點閱：190  下載：26 
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    • 無中文摘要

    Photon calibrator (Pcal) is an independent device that can provide artificial input to an interferometric gravitational-wave detector by exerting the radiation pressure of its own laser on the test mass mirror in the interferometer. It not only can provide a fiducial length reference for calibration purpose but also can inject simulated gravitational waveforms to verify the response of the interferometer to the astrophysical gravitational waves, known as hardware injection test. Currently, the injection signals (Excitations) are produced by KAGRA Digital System(DGS). These signals change the intensity of PCal Laser by acousto-optic modulators (AOM) inside the transmitter module of PCal. However, if the output signal from the Digital System is noisy, it force AOM to modulate laser intensity according to such noisy control signal, resulting in noisy radiation force on the End Test Mirror (ETM). In this dissertation, we implemented and characterized an analog filter known as the De-Whitening filter. We installed it between Digital System output and PCal to address the noise problem while keeping the accuracy of injected signals.

    Abstract ii Acknowledgements iii List of Tables viii List of Figures ix 1 Introduction 1 1.1 Introduction to Gravitational Waves 2 1.1.1 What are gravitational waves 2 1.1.2 How to describe gravitational wave 3 1.2 Detection and Reconstruction of Gravitational Wave Signals 5 1.3 Photon Calibrator (Pcal) 7 1.3.1 Principle of Photon Calibrator 7 1.3.2 Evolution of Photon Calibrators 10 2 Hardware Injection through Photon Calibrator 13 2.1 Principle 13 2.2 Experimental Setup 15 3 Signal Generating System 16 3.1 KAGRA Digital Control System 16 3.2 Noise Problem of Injection Signal 19 3.2.1 Noise Sources from the Injection Signal 20 4 Noise Reduction through De-Whitening Filter 22 4.1 Concept of De-Whitening Filter 22 4.2 Circuit Design 23 4.3 Fidelity of Injection Signals 26 4.4 Noise Reduction Performance 28 4.4.1 Noise Measurement without PCal System 30 4.4.2 Noise Measurement with PCal System 34 5 Validation of Injection Channel 37 6 Discussion and Future Works 41 Bibliography 43

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