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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 groups
RSI 77, 044502 (2006) & CQG 23, 5277 RSI 77, 044502 (2006) & CQG 23, 5277 (2006)(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 5
cm 8.5
D
L
INSULATORBOX
HEATER
COPPERBOX
CLAMP
SAMPLE
THERMOMETERS
SAMPLEHEATER
ViP
TS
LP
5
100
1000
10000
0 50 100 150 200
T (K)
Th
. co
nd
uc
tiv
ity
(W
/mK
)
13 -3
= 260 cm4 10 cmn
12 -3
=5000 cm3 10 cmn
14 -3
=15-25 cm5 10 cmn
-6
Our sample:
purity 1042 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 Setup had been optimized for fibers and rodsand rods 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 wedge
1.7 mrad wedge
1.4 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]
Q
0.4 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]
Q
0.4 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 d
isp
lace
men
t [
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 h
0.1
K
13
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
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