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Drive Beam quadrupoles f or t he CLIC project : a novel met hod of f iducial isat ion and a new micromet ric adjust ment syst em Hélène MAINAUD DURAND, on behalf on CLIC pre-alignment team
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Agenda
• Int roduct ion • A new method of f iducialisat ion:
• Int roduct ion: determinat ion of the magnet ic axis & f iducialisat ion • New proposal • Results
• A 5 DOF micromet ric adjustment system: • Requirements • Descript ion of the solut ion • Process of validat ion and associated results
Out line
A novel method of fiducialisat ion & a new micrometric adjustment system
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Int roduct ion CLIC project
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Int roduct ion CLIC module
• Length of 1 module = 2 m • 20 000 modules in total • 2 DB quads per module • 40 000 DB quads in total!
Some dat a:
DB quad pre -alignment
• For a sliding window of 200 m • Std deviat ions of magne t ic axis of DB
quad w.r.t a st raight line fit < 20 µm
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Int roduct ion
Fiducialisat ion of components
Fiducialisat ion of their common support
Alignment of components on support
Whole assembly ready to be installed
CLIC module
new
new
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Novel method of f iducialisat ion
Fiducialisat ion: → precision within a few µm
→ accuracy est imated at 40 µm
St andard process
Wire cente red and aligned to find t he posit ion minimizing the oscillat ion amplit ude
Wire driven t hrough two ceramic balls in such a way that it is always re inst alled at t he same posit ion
Use of oscillat ing st re t ched wire for MB quad
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Novel method of f iducialisat ion
• Determinat ion of the posit ion of wire using cWPS
• Determinat ion of the posit ion of cWPS w.r.t f iducials using a bench • The posit ion of the f iducials of the bench w.r.t . kinemat ic mount of
cWPS has been measured within 0.3 µm + 1 ppm (Leitz Inf inity CMM)
• AT 401 perform precise and accurate measurements of the DB quad f iducials w.r.t . bench f iducials
Components of novel method
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Novel method of f iducialisat ion The whole setup
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Novel method of f iducialisat ion Process of measurements
DBQ DANFYSIK
Ma rb le
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Novel method of f iducialisat ion
Measurements performed on 3 types of wires (Ø 0.1 mm): • Cu-Be (2003) 5 sets • Cu-Be (2013) 4 sets • Cu-Ni 4 sets
Repeat abilit y of t he method
Int e r-comparison be tween methods
• Ent rance & exit of magne t ic axis de t e rmined by both methods
• In t he st andard method, LTD 500 replaced by AT401 measurement s
• Syst emat ism of 27 µm in horizontal • Due to an e rror in CMM
measurement s ? • Incoherencies obse rved by
AT401 performed on 0.5 ‘’ & 1.5’’ t arge t s
Std dev. of coords Y (µm) Z (µm) Ent rance of magnet ic axis 4 4 Exit of magnet ic axis 4 5
Offse t s be tween methods Y (µm) Z (µm) Ent rance of magnet ic axis 26 3 Exit of magnet ic axis 27 1
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Novel method of f iducialisat ion
• Same measurements than before
• Same process of calculat ions • But use of LTD 500 instead of
AT 401
Int e r-comparison (LTD 500)
Posit ion of magne t ic axis vs current
• Impact of t he current in t he posit ion of t he magne t ic axis not negligeable ,
• Repeatable
Offse t s be tween coords Y (µm) Z (µm) Ent rance of magnet ic axis 2 7 Exit of magnet ic axis 2 7
The syst emat ism comes from the AT 401 measurement s when performed on two diffe rent t ypes of t arge t s 0.5 ‘’ and 1.5 ‘’
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Novel method of adjustment
Requirements: • Adjustment according to 5 DOF (Y, Z
t ranslat ions & 3 rotat ions) • St roke:
• ™ 1 mm in Y and Z (X blocked) • ™ 4 mrad in all rotat ions
• Resolut ion < 5 µm • Must f it the available space • User access only on one side • Load 170 kg
Int roduct ion
Z
Y X
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Novel method of adjustment Solut ion proposed
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Novel method of adjustment Solut ion proposed
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Novel method of adjustment
Validat ion of horizontal & vert ical stand-alone units
Validat ion of the prototype
Validat ion of 2 f inal series
St rategy of validat ion
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Novel method of adjustment
• Long term stabilit y ok • No drif t or creeping observed • Resolut ion of t ranslat ions < 4 µm • Resolut ion of rotat ions < 40 µrad • Manual adjustment inferior to 10 ‘ • Second order impact on the vert ical axis while
adjust ing the radial axis and vice versa
Result s of prototypes
2 se ries inst alled successfully in CLEX
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Summary
• Combining AT401, CMM, cWPS measurements • A budget of error below 5 µm for the f iducialisat ion
process can be considered • A systemat ism has appeared during the measurements
and seems coming f rom AT401 coupled with 0.5’’ or 1.5’’. To be studied
• The syst em has been successfully inst alled in CLEX, allowing adjustment of t he DBQ according to 5DOF, in le ss t han 10 ‘.
• Resolut ions achieved: • Translat ions be low 4 µm • Rotat ions be low 40 µrad
New method of fiducialisat ion proposed
Novel 5DOF micromet ric adjustment syst em
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Perspect ives
• 2 DB quads installed on the same girder, via the 5 DOF micromet ric adjustment system
• Whole assembly installed on a magnet ic calibrat ion facilit y, on a special bench, equipped with addit ional targets and cWPS interfaces (determined by CMM measurements)
• A wire is st retched to perform the magnet ic measurements • It is not the wire that will be displaced to look for the magnet ic axis of
the quadrupole, but the quadrupole it self , using the 5 DOF adjustment system
• Once in posit ion, the posit ion of the wire is measured, using a combinat ion of cWPS, AT401, CMM measurements, in the girder referent ial f rame.
Combinat ion of both methods during t he fiducialisat ion process of DB quads
This is an ext rapolat ion of t he PACMAN project…