9th stabilization meeting
DESCRIPTION
9th stabilization meeting. Status of pole tips measurement. Status. Choice of the measurement device Requirements Tests results Chosen sensor configuration Pole tips measurement on CERN mock-up (dec. 2010) Measurement configuration Solutions to be studied Preliminary tests at Saclay - PowerPoint PPT PresentationTRANSCRIPT
CEA DSM Irfu SIS
9th stabilization meeting
Status of pole tips measurement
CEA DSM Irfu
Status
• Choice of the measurement device– Requirements– Tests results– Chosen sensor configuration
• Pole tips measurement on CERN mock-up (dec. 2010)– Measurement configuration– Solutions to be studied
• Preliminary tests at Saclay– Glue tests– Reflecting surface– Mechanical support– Measurement intent on IPHI mockup
• Planning
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 2
CEA DSM Irfu25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 3
Choice of the measurement device : requirements
– Requirements :
– Characteristics to be described
Amplitude accuracy 1nm and <
Amplitude resolution 0.1 nm and <
Frequency range 1 to 100 Hz
Measurement frequency >400 Hz
Maximum velocity 1 m.s-1
Ability to cross a 60mm long hole in the yoke Max 6mm diameter
Interferometer’s type Michelson, Fabry-Pérot, Doppler…
Acquisition system Analog/digit - I/O
Other parameters acquisition requirement Temp, press, hygrometry, etc…
Reflecting surface λ/? Reflection necessary for optimal measurement
Measurement distance range 0 to …? m
Other requirements Protection, vacuum conditions, influence of magnetic fields, etc…
CEA DSM Irfu09/03/2010 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 4
Choice of the measurement device : tested sensors
Instrument
Characteristics
RENISHAW ATTOCUBE SIOS POLYTEC FIBER
VIBROMETER
INTERFEROMETER TYPE
Michelson Fabry Pérot Michelson Doppler
Differential mode Yes No No Yes
Distance measurement range
0 to 0.6m 0 to >1m according to the sensor
According to the sensor
According to the focusing lens range
Special requirement
Protection from turbulences
Protection from turbulences
Protection from turbulences
To be determined
Cost (k€) 70 to 100 30 to 50 40 40 to 60
Validation No No Yes No
CEA DSM Irfu25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 5
Choice of the measurement device : POLYTEC fiber vibrometer tests results
90 100Hz
1p
10p
100p
1000p
10n
100n
1µ
10µ
m
Geophone_VVibrometerCap Sensor
100 .0 [H z ] 2 .3e-7 [m ] 0 .0 [s ]
90 100Hz
1p
10p
100p
1000p
10n
100n
1µ
10µ
m
Geophone_VVibrometerCap Sensor 100 .0 [H z ]
1 .6e-8 [m ] 0 .0 [s ]
90 100Hz
1p
10p
100p
1000p
10n
100n
1µ
10µ
m
Geophone_VVibrometerCap Sensor
100 .0 [H z ] 3 .2e-9 [m ] 0 .0 [s ]
1 10Hz
1p
10p
100p
1000p
10n
100n
1µ
10µ
m
Geophone_VVibrometerCap Sensor
10 .0 [H z] 1 .9e-7 [m ] 0 .0 [s ]
1 10Hz
1p
10p
100p
1000p
10n
100n
1µ
10µ
m
Geophone_VVibrometerCap Sensor
10 .0 [H z] 1 .8e-8 [m ] 0 .0 [s ]
1 10Hz
1p
10p
100p
1000p
10n
100n
1µ
10µ
m
Geophone_VVibrometerCap Sensor
10 .0 [H z ] 1 .9e-9 [m ] 0 .0 [s ]
100 Hz
BadGood
ampl 230nm ampl 16nm
ampl 3.2nm
ampl 190nm ampl 18nm
ampl 1.9nm
Capacitive senson
Geophone
Vibrometer
10 Hz
Tests results on CERN bench (graphics by M. Guinchard)
Impossibility to have a measurement result at 1 Hz : sensor rejected
CEA DSM Irfu
Choice of the measurement device : chosen sensor configuration
• Available configurations
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 6
Commercial config.
Reflector type Max. speed
Resolution (nm)
Range measurement (mm)
Connected sensors per acquisition unit
Price (k€)
Triple axis SP-TR
λ/10 mirror 0.8 0.1 to 1 according to working distance
0 à 2500 1 40
Adjustable focus LSV
All type of reflecting surface
1.5 0.1 240 à 2500 3 25
Mono-axis SPS
All type of reflecting surface
λ/10 mirror for max. resolution
1.5 0.3 30 à 70, 240 3 20
• Chosen configuration (02/08/2010 meeting CR-MF/2010-1990a) :
• 3 axis working on differential mode or independently• Angle measurement available ±0.3 mrad• Beams distances 13mm• I/O analogical or digital-32bit mode (atmosphere correction factor included
on digital mode only)
CEA DSM Irfu25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 7
Pole tip measurement on CERN mockup : measurement configuration
1
32
1- measurement on yoke 3- measurement on pole2- measurement on pole
(2-3) horizontal wave propagation on pole tip
(1-2) and (1-3) vibration measurement between yoke and pole tip
1
32
1
32
Measurement conditions Purpose Results
No controlled vibration See cultural noise influence on pole tips
FFT spectrum
Calibrated vibration on yoke See propagation on yoke and poles
FFT spectra and propagation diagrams
Calibration vibration on girder See girder’s influence on transmitting vibrations
FFT spectra and propagation diagrams
3 measurement positions
CEA DSM Irfu
Pole tips measurement on CERN mockup : solutions to be studied
• All tests can be performed before on a similar device at Saclay
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 8
Supporting sensor
Drilling hole (angle and diameter)
Reflecting surface (glued or polished?)
Girder and actuators for controlled movements
CEA DSM Irfu
Preliminary tests at Saclay : glue tests and reflecting surface choice
• Purpose : – Verify that no damping due to the glue alter the
displacement measurement– Choose the glue type (wax, araldite, other?)– Time effects on glue– Test :
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 9
Signal comparison
OK : mirror glued
NO: surface to be polished
CEA DSM Irfu
Preliminary tests at Saclay : mechanical support design
Mechanical problem Option chosen for Saclay test
Vibrometer support Glued or tightened on the yoke or independent
Reflecting surface mounting Mirror glued on an invar made wedge
Hole drilled in yoke Ø3mm wished, test on a vibrometer next Thursday
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 10
CEA DSM Irfu
Preliminary tests at Saclay : measurement intent IPHI mockup
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 11
Reflecting surface and glue tests
Vibration transmission tests
Sensor mechanical
interface
Hole diameter test
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Planning
Task J F M A Ma Ju J Ao S O N D J F M
Sensor bought and delivered
Reflector and sensor tests
Mechanical interface design
Measurements on IPHI mockup
Design and fabrication of mechanical interface for CERN mockup
1 point measurement on CERN mockup
N points measurement on CERN mockup
CEA DSM Irfu
Next steps
• Hole diameter test on Thursday
• Sensor device order march-april
• Sensor delivery 12 weeks after (?)
• Mirrors and wedges bought in march
25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête) 13