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LIGO- G020414-00-D Glassy Metals A Possible Solution For Reducing The Thermal Noise In Mirror Suspensions.

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Presentation on theme: "LIGO- G020414-00-D Glassy Metals A Possible Solution For Reducing The Thermal Noise In Mirror Suspensions."— Presentation transcript:

1 LIGO- G020414-00-D Glassy Metals A Possible Solution For Reducing The Thermal Noise In Mirror Suspensions

2 LIGO- G020414-00-D LIGO Laboratory at Caltech 2 Why Glassy Metals? Problems Mirror Suspension Thermal Noise Caused By Dissipation of Suspension Oscillation Energy Solutions 1.Use High Quality Factor Materials 2.Optimize Suspension Geometry

3 LIGO- G020414-00-D LIGO Laboratory at Caltech 3 Fused Silica Vs. Glassy Metals Fused Silica 1.Higher Internal Q Factor 1.Lower Useful Yield Point 2.Limited Geometries Glassy Metals 1.Higher Useful Yield Point 2.Resistant to Corrosion 3.Better Geometries 1.Lower Internal Q Factor

4 LIGO- G020414-00-D LIGO Laboratory at Caltech 4 Effect of Geometry on Q Factor Q Factor Q p = Q o (1+K G /K SP )  Q o (K G /K SP ) Restoring Force of Spring K SP = EI Inertia I = wt 3 /2 = st 2 /2 t w s

5 LIGO- G020414-00-D LIGO Laboratory at Caltech 5 MoRuB - Estimates Density,10.3 g/cc Heat Conductivity,10 W/K-m Heat Capacitance,30 J/K-mole Thermal Expansion Coefficient,5.5 x 10 -6 (K -1 ) Elastic Modulus,250 GPa Poisson Modulus,0.36 – 0.38 Breaking Point,> 5 GPa These numbers should be accurate to  ~20%.

6 LIGO- G020414-00-D LIGO Laboratory at Caltech 6 MoRuB Performance (P. Willems) Glassy Metal Q = 10 4 10 x 3000 = 30,000  m 60 kg Mirror Fused SiO2 Dumb Bell Shaped Fiber Q = 8.4 x 10 8 357 um diameter, 100,000 um2 40 kg Mirror

7 LIGO- G020414-00-D LIGO Laboratory at Caltech 7 The Glassy Metals Team Maddalena MantovaniHardness & Elasticity / Undergraduate Stefano TirelliStress & Strain / Undergraduate Brian EmmersonX-Ray Diffraction / Undergraduate Michael HallThermal Properties / Undergraduate Valerie CervantesData Analysis (TP) / HS Student Rosalia StellacciCreep Analysis / Undergraduate Xavier De LepineFEA of Flex Joint / Undergraduate Eric KortSample Uniformity / Undergraduate Stoyan NikolovFEA of Flex Joint / Undergraduate Barbara SimoniPhase Transition / Undergraduate ChenYang WangStress & Strain / Graduate Student Hareem TariqCoordinator / Graduate Student Jan SchroersPost Doctoral Scholar Alessandro BertoliniAssistant Professor (University of Pisa) Bill JohnsonProfessor (Materials Science) Riccardo DeSalvoSr. Scientist

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