Physical Property Measurements of Glassy Metals

1. Michael Hall Six Month Intern Drexel University Measuring Thermal Properties LIGO-G020415-00-D Valerie Cervantes High School Student Mayfield Senior School Data Processing Physical Property Measurements of Glassy Metals LIGO Laboratory at Caltech

2. The Quantum Design Cryostat • Temperature Range: 1.9K – 400K • Pressure: 8.9 x 10-5 Torr • Samples: Metglas, MoRuB LIGO Laboratory at Caltech

3. Thermal Transport - Theory • Generate Heat Pulse • Measure T = Thot - Tcold • Estimate Corrections • Calculate Thermal Conductivity! LIGO Laboratory at Caltech

4. Thermal Transport - Hardware LIGO Laboratory at Caltech

5. The Cryostat – HiVac System • HiVac Pressure: 9x10-5 Torr • Many Problems!! • Result: Quantum Design is Redesigning Cryopump LIGO Laboratory at Caltech

6. Cryopump Failure LIGO Laboratory at Caltech

7. Continuous Measurement LIGO Laboratory at Caltech

8. Ideal Data Acquisition LIGO Laboratory at Caltech

9. Poor Data Acquisition LIGO Laboratory at Caltech

10. TTO – Stable Measurement LIGO Laboratory at Caltech

11. Data Processing LIGO Laboratory at Caltech

12. Data Processing T LIGO Laboratory at Caltech

13. Thermal Transport Formulas • Conductance • K = P/T • Conductivity •  = [(PIN-PRAD)/T-KWIRES](L/A) • PRAD = (S/2)(THOT4-TCOLD4) • KWIRES is Measured Directly! LIGO Laboratory at Caltech

14. Measurement Adjustments • Stable Measurements • T ~ 0.5K – 1.5K • Measure Parasitic Conductance • Manual Data Processing LIGO Laboratory at Caltech

15. Thermal Conductivity LIGO Laboratory at Caltech

16. Heat Capacity - Theory • Generate Heat Pulse • Measure RC • Estimate Corrections • Calculate Heat Capacity! • T = Texp[-t/R8(CP+CG+CS)] LIGO Laboratory at Caltech

17. Heat Capacity – Sample Data LIGO Laboratory at Caltech

18. Q Factor Measurement LIGO Laboratory at Caltech

19. The Glassy Metals Team • Maddalena Mantovani Hardness & Elasticity / Undergraduate • Stefano Tirelli Stress & Strain / Undergraduate • Brian Emmerson X-Ray Diffraction / Undergraduate • Michael Hall Thermal Properties / Undergraduate • Valerie Cervantes Data Analysis (TP) / HS Student • Rosalia Stellacci Creep Analysis / Undergraduate • Xavier De Lepine FEA of Flex Joint / Undergraduate • Eric Kort Sample Uniformity / Undergraduate • Stoyan Nikolov FEA of Flex Joint / Undergraduate • Barbara Simoni Phase Transition / Undergraduate • ChenYang Wang Stress & Strain / Graduate Student • Hareem Tariq Coordinator / Graduate Student • Jan Schroers Post Doctoral Scholar • Alessandro Bertolini Assistant Professor (University of Pisa) • Bill Johnson Professor (Materials Science) • Riccardo DeSalvo Sr. Scientist LIGO Laboratory at Caltech