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Mechanical losses in materials for future cryogenic gravitational wave detectors ; Mechanische Verluste in Materialien für zukünftige kryogene Gravitationswellendetektoren
The aim of this work consisted in the study of the mechanical losses of potential substrate materials for future cryogenic interferometric gravitational wave detectors to reduce the thermal noise of their optical components. Interferometric gravitational wave detectors (IGWDs) are among the instruments with the highest sensitivity ever built. To increase the detection probability and also to gain a deeper look in the universe by establishing a gravitational wave astronomy a further enhancement of sensitivity is inevitable. A main noise source to be reduced is the thermal noise of the optical components like mirrors and beam splitter. A very promising approach for a reduction of thermal noise is to deprive thermal energy by decreasing the operating temperature of the IGWDs from room temperature to cryogenic temperatures. Since thermal noise mainly depends on two physical values - temperature and mechanical loss at that temperature and given frequency - materials showing low mechanical losses at low temperatures are then required for these future detectors. Fused silica, which is the common material of current IGWDs operated at room temperature, and crystalline quartz, crystalline calcium fluoride, and crystalline silicon, which are potential low-loss materials, have been studied in this work. ; Ziel dieser Arbeit war es, die mechanischen Verluste von potentiellen Substratmaterialien für die Spiegel zukünftiger kryogener interferometrischer Gravitationswellendetektoren (IGWD) zu untersuchen. Da mechanische Verluste mit thermischem Rauschen in diesen äußerst sensitiven Detektoren in Zusammenhang stehen, bietet eine systematische Analyse derselben die Möglichkeit, gezielte Maßnahmen zur Rauschreduzierung zu ergreifen und damit die Detektionswahrscheinlichkeit von Gravitationswellen zu steigern, sowie die technischen Erfordernisse für eine Astronomie basierend auf Gravitationswellen zu schaffen. Ein vielversprechender Weg zur Reduzierung des thermischen Rauschens in den derzeit bei Raumtemperatur betriebenen IGWDs ...
Mechanical losses in materials for future cryogenic gravitational wave detectors ; Mechanische Verluste in Materialien für zukünftige kryogene Gravitationswellendetektoren
The aim of this work consisted in the study of the mechanical losses of potential substrate materials for future cryogenic interferometric gravitational wave detectors to reduce the thermal noise of their optical components. Interferometric gravitational wave detectors (IGWDs) are among the instruments with the highest sensitivity ever built. To increase the detection probability and also to gain a deeper look in the universe by establishing a gravitational wave astronomy a further enhancement of sensitivity is inevitable. A main noise source to be reduced is the thermal noise of the optical components like mirrors and beam splitter. A very promising approach for a reduction of thermal noise is to deprive thermal energy by decreasing the operating temperature of the IGWDs from room temperature to cryogenic temperatures. Since thermal noise mainly depends on two physical values - temperature and mechanical loss at that temperature and given frequency - materials showing low mechanical losses at low temperatures are then required for these future detectors. Fused silica, which is the common material of current IGWDs operated at room temperature, and crystalline quartz, crystalline calcium fluoride, and crystalline silicon, which are potential low-loss materials, have been studied in this work. ; Ziel dieser Arbeit war es, die mechanischen Verluste von potentiellen Substratmaterialien für die Spiegel zukünftiger kryogener interferometrischer Gravitationswellendetektoren (IGWD) zu untersuchen. Da mechanische Verluste mit thermischem Rauschen in diesen äußerst sensitiven Detektoren in Zusammenhang stehen, bietet eine systematische Analyse derselben die Möglichkeit, gezielte Maßnahmen zur Rauschreduzierung zu ergreifen und damit die Detektionswahrscheinlichkeit von Gravitationswellen zu steigern, sowie die technischen Erfordernisse für eine Astronomie basierend auf Gravitationswellen zu schaffen. Ein vielversprechender Weg zur Reduzierung des thermischen Rauschens in den derzeit bei Raumtemperatur betriebenen IGWDs ...
Mechanical losses in materials for future cryogenic gravitational wave detectors ; Mechanische Verluste in Materialien für zukünftige kryogene Gravitationswellendetektoren
Schröter, Anja (author) / Seidel, Paul / Bechstedt, Friedhelm / Hough, James
2008-01-01
Theses
Electronic Resource
English
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