1. 1 News in the thermo-mechanical measurement in the Firenze facility Gianpietro Cagnoli a,b), Enrico Campagna a,c), Elisabetta Cesarini a), Matteo Lorenzini a), Giovanni Losurdo a), Filippo Martelli a,c), Francesco Piergiovanni a,c), Flavio Vetrano a,c) a) INFN Sez. Firenze b) University of Glasgow c) University of Urbino 3rd ILIAS-GW Annual General Meeting, London October 26-27, 2006

2. 2 Research lines in STREGA M5 task:Characterization of the losses of Si fibres at different temperatures, reaching the Liquid Nitrogen temperature Research lines in STREGA M5 task:Characterization of the losses of Si fibres at different temperatures, reaching the Liquid Nitrogen temperature Measurement of Silicon fibres: first results published in collaboration with the Pisa and Perugia INFN groups Measurement of Silicon fibres: first results published in collaboration with the Pisa and Perugia INFN groups RSI 77, 044502 (2006) & CQG 23, 5277 (2006) Work in progress on thermomechanical characterization of new materials Work in progress on thermomechanical characterization of new materials Facilities setup in Florence lab Facilities setup in Florence lab Thermal conductance measurement facility Thermal conductance measurement facility Results on Si and Silicate-bonding Results on Si and Silicate-bonding Q measurement facility Q measurement facility Innovative nodal suspension, designed and realized Innovative nodal suspension, designed and realized measurement facility measurement facility Double FP cavity setup being completed Double FP cavity setup being completed Scientific activity of Firenze-Urbino group in STREGA

3. 3 Facility for – The cryostat Optical windows Inner tank Liquid He Outer tank Liquid N 2 Vacuum chamber Experimental chamber 30 cm Inner cold shield Outer cold shield Optical windows

4. 4 Facility for Measurements on a Si reed INSULATOR BOX HEATER COPPER BOX CLAMP SAMPLE THERMOMETERS SAMPLE HEATER

5. 5 Facility for Measurements on a Si reed Solid lines from Y.S. Touloukian, E.H. Buyco, Thermo-physical properties of matter, Plenum, NY, 1970

6. 6 Facility for Si-bonded samples 1 ø x ¼ silicon disks silicate bonded by the Glasgow group 1 ø x ¼ silicon disks silicate bonded by the Glasgow group Work done in collaboration between Glasgow and Florence Work done in collaboration between Glasgow and Florence Heat sink Cold plate Heater Sample Thanks to G. Frossati for providing the PT1000 sensors

7. 7 Setup had been optimized for fibers and rods Setup had been optimized for fibers and rods Heat flux inhomogeneity problems Heat flux inhomogeneity problems 2 PT1000 put on the lateral surface 2 PT1000 put on the lateral surface P=0.5 W T=30 mK P=0.5 W T=30 mK Resolution around 500 K Resolution around 500 K Bad data reproducibility Bad data reproducibility Not depending on Not depending on Power losses by radiative emission Power losses by radiative emission PT1000 calibration PT1000 calibration Hidden reason under investigation Hidden reason under investigation Bad electrical contacts? Bad electrical contacts? Facility for Si-bonded samples

8. 8 Facility for Q measurements GeNS: a Gentle Nodal Suspension Simple but innovative idea Simple but innovative idea Thickness < diameter stable equilibrium Thickness < diameter stable equilibrium Advantages w.r.t. other methods Advantages w.r.t. other methods No clamp No clamp Allows to test coated samples Allows to test coated samples Minimize the contact surface Minimize the contact surface Independent relevant parameter estimation Independent relevant parameter estimation Disk-sphere friction Disk-sphere friction Surface roughness Surface roughness Q-dependence on suspension centering Q-dependence on suspension centering

9. 9 Facility for Q: GeNS at work 4.75 ø mm steel ball bearing 4.75 ø mm steel ball bearing 15 m diameter contact surface (estimated) 15 m diameter contact surface (estimated) Optical lever readout Optical lever readout

10. 10 Facility for Q: measurements Samples Samples HOQ300 fused silica 75 ø mm disks HOQ300 fused silica 75 ø mm disks 1÷3 mm thickness 1÷3 mm thickness Normal/special surface working (parallelism) Normal/special surface working (parallelism) Flamed/unflamed lateral surface Flamed/unflamed lateral surface Q vs frequency (residual pressure 10e-5 mbar) Q vs frequency (residual pressure 10e-5 mbar)

11. 11 Facility for Q: measurements Q versus vacuum chamber pressure Q versus vacuum chamber pressure Reproducibility around 3% even after a month Reproducibility around 3% even after a month Q versus suspension position Q versus suspension position 1.3 m displacement precision ( 2mm on the target screen) 1.3 m displacement precision ( 2mm on the target screen) Measured Q in millions

12. 12 Facility for small displacement Fluctuation below 0.01 K needed Fluctuation below 0.01 K needed Few mK stability reached Few mK stability reached Heating wires for RC temperature control 1 h 0.1 K

13. 13 Future work Facility for Facility for Characterization of Si-bonding influence on the thermal conductance Characterization of Si-bonding influence on the thermal conductance Facility for Q Facility for Q Characterization of GeNS with measurement on Suprasil 311 Characterization of GeNS with measurement on Suprasil 311 Coated sample investigation Coated sample investigation Facility for Facility for Complete setup Complete setup