LINAC STABILISATION (INCLUDING FF) MECHANICAL STABILISATION AND NANO POSITIONING WITH ANGSTROM RESOLUTION The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD K. Artoos , C. Collette (ULB), M. Esposito, C. Eymin, P. Fernandez Carmona , S. Janssens, R. Leuxe, H. Mainaud Durand, M. Modena A. Jeremie, J. Allibe, L. Brunetti, J.-P. Baud, G. Balik , G. Deleglise, S. Vilalte, B. Caron, C. Hernandez
K. Artoos , C. Collette (ULB), M . Esposito, C. Eymin, P . Fernandez Carmona , S . Janssens, R. Leuxe, H. Mainaud Durand, M. Modena. LINAC STABILISATION (including FF) Mechanical stabilisation and nano positioning with Angstrom resolution. - PowerPoint PPT Presentation
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LINAC STABILISATION(INCLUDING FF)
MECHANICAL STABILISATION AND NANO POSITIONING WITH ANGSTROM RESOLUTION
The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD
K. Artoos , C. Collette (ULB), M. Esposito, C. Eymin, P. Fernandez Carmona , S. Janssens, R. Leuxe, H. Mainaud Durand, M. ModenaA. Jeremie, J. Allibe, L. Brunetti, J.-P. Baud, G. Balik , G. Deleglise, S. Vilalte, B. Caron, C. Hernandez
• Non linearity• Bandwidth, instabilities• Control delay• Parameter uncertainties• Controller authority, collocation
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K.Artoos, Stabilisation WG , 21th February 2013
Machine precision vs sizeC. Collette
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Mass/Actuator Resolution/ Range/k/ Bandwidth
𝑓 0 (𝜔 )=√𝑘𝑎𝑐𝑡𝑢𝑎𝑡𝑜𝑟
𝑚𝑙𝑜𝑎𝑑
Stress < depolarisation stressA For same Range: P
A
Bandwidth is limited by
Remark about load compensating springs:
• Actuator slew rate
Frequency
Am
plit
ude
Range
Force
Load compensation reduces range + bandwidthImproves resolution *
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K.Artoos, Stabilisation WG , 21th February 2013
Machine precision vs sizeC. Collette
Technological limitation for larger com
ponents
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Resolution limitationsSensors
Stabilisation
Limitations:1. Thermal stability
(*alignment)2. EM stray fields3. Sensor resolution
(wavelength light)Expected maximum one order of magnitude improvement resolution in next decade (Without major technological innovation) Low freq. is where you can win the most
HL-LHC HE-LHC LHiC NICA RHIC II FAIR LHeC eRHIC ELICSuper KEKB
SuperB ILC CLICPFWA LWFA
Dielec-tric Acc
Muon Collider
Neutrin Factory
Project X
Coordination CERN CERN CERN DUBNA BNL GSI CERN BNL JLAB KEK LNF GDE CLIC collSLAC/LBL SLAC? MAP NF Coll FNALElectron cloud Cornell? CESR-TA X X X X X X X X X X XSC magnets (High Field, Fast Cycling, Super-Ferric, Wigglers)
Magnet R&D network?
CERN, FNAL, GSI
HF HF/FC HF SF FC HF HF W
Super-Conducting RF TESLA Tech coll?FLASH, NML, STF, XFEL X X X X X X XHigh field NC Structures ? CTF3, SLAC, KEK X XLow emittance generation CLIC/ILC WG? ATF1 X X X X X XNanometer beam focusing ATF coll ATF2 X X X X X X XAlignment and stabilisation ? AlignTF, StabTF X X X X X X X X XRF power source high efficiency ? X X X X X X XHigh beam power generation&handling ? SNS, PSI X X X X X X X X X X XCollimation & targets high power beams ? HRad,HARP,MERIT X X X X X X X X X XCooling (Electron, Coherent, Stochastic) ? RHIC S,E S C C EIonisation cooling ? MICE,MTA, MuCool X Xcrab cavities ? KEKB X X X X X XPlasmas LBL, SLAC BELLA, FACET XLasers LBL, Ec. Polyt BELLA, LULI X X X XDrive beam generation CTF3 collab CTF3, FACET X X XBeam dynamics simuations ? Test benches X X X X X X X X X X X X X X X X X XBeam Instrumentation ? X X X X X X X X X X X X X X X X X XBeam based feedbacks ? X X X X X X X XEnergy recovery linacs CEBAF? CEBAF, BNL R&D ERL X X XNanobeam scheme (LPA & Crab waist) B Fact collab? DAFNE X X XPositron generation ? X X X X X XPolarisation ? X X X X X X X XDynamic vacuum ? X X X X X X X X X
Muons & NeutrinosR&D/Projects
Test Facilities
Protons Ions Electron-Hadrons B Factories Linear Colliders
J.P.Delahaye ICHEP 2010 (28/07/10)
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Integrated luminosity simulations
No stabilization 68% luminosity lossSeismometer FB maximum gain (V1)
13%
Seismometer FB medium gain (V1mod)
6% (reduced peaks @ 0.1 and 75 Hz)
Seis. FB max. gain +FF (FBFFV1mod)
7%
Inertial ref. mass 1 Hz (V3mod)
11%
Inertial ref. mass 1 Hz + HP filter (V3)
3%
Courtesy J. Snuverink, J. Pfingstner et al.Commercial Seismometer
Custom Inertial Reference mass
K.Artoos, Stabilisation WG , 21th February 2013Stef Janssens
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Comparison sensors
Sensor Resolution Main + Main -
Actuator sensor 0.15 nm No separate assembly
ResolutionNo direct measurement of magnet movement
Capacitive gauge 0.10 nm Gauge radiation hard Mounting tolerancesGain change w. Orthogonal coupling
Interferometer 10 pm Accuracy at freq.> 10 Hz
CostMounting toleranceSensitive to air flowOrthogonal coupling