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News in the News in the thermo-mechanical thermo-mechanical measurement in the measurement in the

Firenze facilityFirenze facilityGianpietro 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)a) INFN Sez. INFN Sez. FirenzeFirenze

b)b) University of University of GlasgowGlasgow

c)c) University of University of UrbinoUrbino

3rd ILIAS-GW Annual General Meeting, London October 26-27, 20063rd ILIAS-GW Annual General Meeting, London October 26-27, 2006

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Research lines in STREGA M5 task: Research lines in STREGA M5 task: ““Characterization of the losses of Si fibres at Characterization of the losses of Si fibres at different temperatures, reaching the Liquid different temperatures, reaching the Liquid Nitrogen temperatureNitrogen temperature ”” Measurement of Silicon fibres: first results Measurement of Silicon fibres: first results

published in collaboration with the Pisa and published in collaboration with the Pisa and Perugia INFN groupsPerugia INFN groupsRSI 77, 044502 (2006) & CQG 23, 5277 (2006)RSI 77, 044502 (2006) & CQG 23, 5277 (2006)

Work in progress on thermomechanical Work in progress on thermomechanical characterization of new materialscharacterization of new materials

Facilities setup in Florence labFacilities setup in Florence lab Thermal conductance measurement facilityThermal conductance measurement facility

Results on Si and Silicate-bondingResults on Si and Silicate-bonding Q measurement facilityQ measurement facility

Innovative nodal suspension, designed and realizedInnovative nodal suspension, designed and realized measurement facilitymeasurement facility

Double FP cavity setup being completedDouble FP cavity setup being completed

Scientific activity of Scientific activity of Firenze-Urbino group in Firenze-Urbino group in

STREGASTREGA

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Facility for Facility for – The cryostat– The cryostat

Optical windows

Inner tank Liquid He

Outer tank Liquid N2

Vacuum chamber

Experimental chamber

30 cm Inner cold shield

Outer cold shield

Optical windows

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Facility for Facility for Measurements on a Si reedMeasurements on a Si reed

mK 100T

mm 5cm 8.5

DL

INSULATORBOX

HEATER

COPPERBOX

CLAMP

SAMPLE

THERMOMETERS

SAMPLEHEATER

ViP

TSLP

5

100

1000

10000

0 50 100 150 200T (K)

Th. c

ondu

ctiv

ity (W

/mK

)

13 -3 = 260 cm

4 10 cmn

12 -3=5000 cm

3 10 cmn

14 -3=15-25 cm

5 10 cmn

-6

Our sample: purity 10

42 cm (measured)

Facility for Facility for Measurements on a Si Measurements on a Si

reedreed

Solid lines from Y.S. Touloukian, E.H. Buyco, “Thermo-physical properties of matter”, Plenum, NY, 1970

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Facility for Facility for Si-bonded Si-bonded samplessamples

1”1”øø xx ¼ ” silicon disks ¼ ” silicon disks silicate bonded by the silicate bonded by the Glasgow groupGlasgow group

Work done inWork done incollaboration between collaboration between Glasgow and Florence Glasgow and Florence Heat

sink

Cold plate

HeaterSample

Thanks to G. Frossati for providing the PT1000 sensors

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Setup had been optimized for fibers and Setup had been optimized for fibers and rodsrods Heat flux inhomogeneity problemsHeat flux inhomogeneity problems 2 PT1000 put on the lateral surface2 PT1000 put on the lateral surface PP=0.5 W =0.5 W TT=30 mK=30 mK

Resolution around 500 Resolution around 500 KK Bad data reproducibilityBad data reproducibility

Not depending onNot depending on Power losses by radiative emission Power losses by radiative emission PT1000 calibrationPT1000 calibration

Hidden reason under investigation Hidden reason under investigation Bad electrical contacts?Bad electrical contacts?

Facility for Facility for Si-bonded Si-bonded samplessamples

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Facility for Q Facility for Q measurementsmeasurements

GeNSGeNS: a : a GeGentle ntle NNodal odal SSuspensionuspension Simple but innovative ideaSimple but innovative idea

Thickness < diameter Thickness < diameter stable equilibrium stable equilibrium

Advantages w.r.t. other methodsAdvantages w.r.t. other methods No clampNo clamp

Allows to test coated samplesAllows to test coated samples Minimize the contact surfaceMinimize the contact surface

Independent relevant parameter estimationIndependent relevant parameter estimation Disk-sphere frictionDisk-sphere friction Surface roughnessSurface roughness Q-dependence on suspension centeringQ-dependence on suspension centering

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Facility for Q: GeNS at Facility for Q: GeNS at workwork

4.75 4.75 øø mm steel ball bearing mm steel ball bearing 15 15 m diameter contactm diameter contact

surface (estimated)surface (estimated) Optical lever readoutOptical lever readout

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Facility for Q: Facility for Q: measurementsmeasurements

SamplesSamples HOQ300 fused silica 75 HOQ300 fused silica 75 øø mm disks mm disks

11÷3 mm thickness÷3 mm thickness Normal/special surface working (parallelism)Normal/special surface working (parallelism) Flamed/unflamed lateral surfaceFlamed/unflamed lateral surface

Q vs frequency (residual pressure ≈ 10e-5 mbar)Q vs frequency (residual pressure ≈ 10e-5 mbar)

0.0E+00

5.0E+05

1.0E+06

1.5E+06

0 1000 2000 3000 4000 5000 6000 7000 8000 9000frequency [Hz]

Q

1.4 mrad wedge1.7 mrad wedge1.4 mrad wedge flamed

0.E+00

1.E+06

2.E+06

3.E+06

4.E+06

5.E+06

0 5000 10000 15000

Frequency [Hz]

Q0.4 mrad wedge

2.4 mrad wedge

0.4 mrad wedge flamed - a

0.4 mrad wedge flamed - b

0.4 mrad wedge flamed - c

flamed

0.E+00

1.E+06

2.E+06

3.E+06

4.E+06

5.E+06

0 5000 10000 15000

Frequency [Hz]

Q0.4 mrad wedge

2.4 mrad wedge

0.4 mrad wedge flamed - a

0.4 mrad wedge flamed - b

0.4 mrad wedge flamed - c

flamed

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Facility for Q: Facility for Q: measurementsmeasurements

Q versus vacuum chamber pressureQ versus vacuum chamber pressure

Reproducibility around 3% even after a monthReproducibility around 3% even after a month

Q versus suspension positionQ versus suspension position 1.3 1.3 m displacement precision ( → 2mm on the target m displacement precision ( → 2mm on the target

screen)screen)

fvs pressure (75mm x 1mm special disk)

1.E-08

1.E-07

1.E-06

1.E-05

1.E-03 1.E-02 1.E-01

P [mbar]

fdisk (measured)

air (Saulson '94)

total

-80 -60 -40 -20 0 20-40

-30

-20

-10

0

10

20

30

40

x displacement [ m]

y di

spla

cem

ent [

m]

4.0 4.1

3.9 3.9

4.0

4.1

4.0

4.0 4.0

Measured Q in millions

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Facility for small Facility for small displacementdisplacement

Fluctuation below 0.01 K neededFluctuation below 0.01 K needed Few mK stability reachedFew mK stability reached

Heating wires for RC temperature control

1 h0.

1 K

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Future workFuture work Facility for Facility for

Characterization of Si-bonding Characterization of Si-bonding influence on the thermal conductance influence on the thermal conductance

Facility for Q Facility for Q Characterization of GeNS with Characterization of GeNS with

measurement on Suprasil 311measurement on Suprasil 311 Coated sample investigationCoated sample investigation

Facility for Facility for Complete setupComplete setup