installation of fd in september a.jeremie, b.bolzon, n.geffroy, g.gaillard, j.p.baud, f.peltier with...
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Installation of FD in September
A.Jeremie, B.Bolzon, N.Geffroy, G.Gaillard, J.P.Baud, F.Peltier
With the help of KEK, SLAC, KNU and CERN colleaguesFor measurement details: see Benoit Bolzon’s presentation tomorrow
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Outline
• FD support specifications• Initial active support study• Rigid support on intermediate feet• Final rigid support• Installation photos• Conclusion
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SBPM
QC3
SBPMFFTB2.13
S3.00
SF1 QF1
76.2
450.1
575
200180 311.9
785380
45 6553.1
SBPM
QC3
SBPM FFTB2.13
S3.00
SD0 QD0
76.2
450.1
200180 311.9
575
450.145 6553.1
785380
IP
1940 mm
1225
What is needed to support all these components?
Shintake Monitor: information on the beam size
Final doublets
FD layout
Not the latest drawing!
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For QD0 at ATF2: 6-7nm tolerance
Two solutions possible:1. Isolate/cut vibrations in the desired frequency range2. Push the first resonance peaks at higher frequencies where ground motion is
lower
0.1Hz ~100Hz
Repetition rate 1Hz=> need a “mechanical” stabilisation from 0.1Hz (below, the beam based alignment works)
6-7nm
ATF2 specificationsATF ground motion
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FD support specifications
• Desired frequency range : 0.1Hz-100Hz• Support that can evolve as Final Focus
design evolves (should be able to change support)
• 6-7nm jitter tolerance• 1.2m beam height
Honeycomb table
Isolator: Passive => turned OFFActive => turned ON
Initial suggestion: CERN wanted to contribute by sending the commercial TMC table
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Vibrations of the passive TMC tableVertical direction: Integrated RMS
Above 0.5Hz: Amplification
Above 30Hz: damping begins
Below 0.5Hz: No amplification or damping on the table
27
Amplification
0.5
~Same response
Amplification
Damping
30
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Vibrations of the active TMC table
Above 0.8Hz: Damping on the table
Factor 7 of damping above 1.5Hz
Vertical direction: integrated RMS
Below 0.8Hz: Amplification on the table
Need to look for an alternative solution
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Ground
Shintake monitor
Final doublets
Beam
Interferencefringes
We want the measurement to have a coherent behaviour with respect to the “beam” => Relative motion between Shintake monitor and final doublets: 6-7nm in the vertical axis above 0.1Hz
4mGood ground motion coherence:
measured on KEK site Separate stiff supports rigidly fixed to the floor
Back to basics: Specifications
Study the honeycomb block but without active feet
If Shintake Monitor and FD on separate active supports, coherence is lost
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Empty: 56.2Hz with FD weight: 26.2Hz
Study of the block on 4 feet(free-free configuration: 1st peak at 230Hz)
In the middle of : 0.1Hz-100Hz!Simple simulation (plain block)
Measurements•Empty: 74Hz•With FD weight: 46Hz
Do these peaks come from the block or the feet?
Total relative motion ([0.17; 100]Hz): 6.7nm Above tolerances (6nm)!Contribution of the peak alone: [10; 100]Hz: 5.7nm
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Modal deformation measurementsBlock fixed on 4 feet
Impact hammer on different points => Modal deformation for each resonance up to 150Hz in 3 axes
2 tri-axial accelerometers
Michael GUINCHARD (CERN)
Z
XY
The block is rigid (no deformations) , but the feet allow it to “jump” around
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Modes 1) T-X 2) T-Y 3) R-Z 4) T-Z 5) R-Y 6) R-X
Frequency (Hz) 34.8 41.8 60.6 80.6 103.9 136.0
Damping (%) 2.8 2.6 2.4 2.3 2.1 4.0
6 first modes: rigid body modes (6 degrees of freedom)
Keep the rigid block (no deformation in x,y nor z) but remove the 4 feet to cut these modes
T: Translation
R: Rotation
Empty: 526.1Hz with FD weight: 135.2Hz
Block fixed to the floor on its entire surface
simulation
Modal deformation results
The peaks are outside the interval: 0.1Hz - 100Hz
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IPQD0
SF1
QF1 SD0
Room for slings
Final assemblyQuads, sextupoles and movers :SLAC (from FFTB)From floor to mover: LAPP (new)BPM+support: KNU, LAPP
2.4m
Adjustment possible in x, y, z with shims (0.05mm) and adjustment pushers for 1.2m beam height
beeswax: good vibration transmission, easy to
unglue, stable in time, rad hard
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Block fixed on one entire face to the floor
Experimental set-up
3 steel plates bolted to the floor
Honeycomb table
Bees wax
Good boundary conditions chosen for the block:
Relative motion should be very low compared to tolerances
No masses: no peakWith masses: 92Hz
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Impact of the resonance peak on the RMS
Object Peak position Integrated RMS
4-feet table with weight
41Hz 5.7nm
Glued table with weight
92Hz 0.3nm
Sextupole on mover/support
100Hz 0.26nm
Quad on mover/support
76Hz 1.1nm
Adding up the integrated rms values keeps us under the 6-7nm tolerances
The honeycomb table fixed to the floor on whole surface, with adjusted movers validated for ATF2 Final Doublet support measured in Annecy
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For the measurements at KEK see Benoit Bolzon’s presentation tomorrow
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Installation at KEK from September 16 to September 25 2008
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Unpacking
Check height at each step of installation
Installing the steel plates
Shims against floor inhomogeneities
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Installing beeswax on plates bolted to the ground
Table comes down
Installing “feet” and movers
Great team-work
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QD0 comes down
QD0 installed
Everything installed, centered and aligned in x, y and z, Thursday September 25 2008; Next step: BPM installation
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Adjustable in beam direction
Adjustable in height with shims
Adjustable longitudinally through the attachment screw
Al
SSS-BPM 20kg
BPM supportsS-BPM machined, tested and delivered by KNU
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S-BPM installed October 15, 2008
We have to make sure everybody uses the same and correct/measured distances for the S-BPM readout point
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FD mid-november 2008
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•ATF2 rigid Final Doublet support chosen (vs. active support)•SLAC FFTB movers adjusted to meet beam height•Vibration measurements validate the rigid support choice•ATF2 Final Doublet support installed at KEK
Conclusion
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Conclusion
Thank you for the available, helpful and competent KEK team during our stay
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Back-up
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Integrated RMS of relative motion between table and floor to predict on the ATF site
Calculation performed for these specific needs:
Calculation to perform by integrating the vibratory behaviour of the table measured at LAPP and the data of ATF ground motion
2
1
k
kx
*x- yint )k(DSP]1)k(H][1)k(H[ )k(RMS
Relative motion between table and floor