1. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

2. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
TE-MSC-MM is the CERN Section specialized in the magnetic measurements.
The roles of the specialists:
Measuring and quantifying several parameters in linked with the magnetic field of the magnets used in the accelerators.
Magnitude, orientation, default of the Magnetic field, etc.
Developing the measuring instruments according to the magnetic parameters and to the magnets characteristics.
Participation of EN-MME-EDS section
Our Team provide the mechanical studies and drawings of theses magnetic devices
in order to enable the manufacturing, the assembling and the using of these instruments.
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

3. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
The FAIR project (Facility for Antiproton and Ion Research)
International collaboration for the development and the realization of the Super FRS accelerator.
2001: Conceptual Design Report by GSI institute.
2006: FAIR Baseline Technical Report.
October 2007: Start of the project.
Partner states: Austria, China, Finland, France, Germany, Great Britain, Greece, India, Italy, Romania, Russia, Slovenia, Spain, Sweden.
3000 scientists Budget: 1027 M€ (65 % Germany)
The Super- FRS (Super-Fragmentseparator) at Darmstadt (Germany)
The Super-FRS at FAIR is a powerful superconducting in-flight separator and also a versatile high-resolution spectrometer system for exotic nuclei over a large energy range equivalent to a maximum magnetic rigidity of 20 Tm. This program is partially based on the previous experimental results obtained with the FRS of GSI.
Fragmentation 238U Beam (Fission).
Production of rare isotopes with very short lifecycles.
Separation
Studies of this very short lived nuclei of Medium mass.
The Goal of the Physics at FAIR
To solve the puzzle posed by the structure of matter.
To understand the various metamorphoses of matter
since the creation of the universe.
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

4. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
Collaboration between CERN and GSI in the project FAIR
TE-MSC-MM is in charge of the magnetic measurements of the several supraconducting magnets produced by GSI.
2 symmetrical dipoles (L = 2.2 m, Rmag: 12,5 m; ϴmag= 9.75 °)
3 shorts Multiplets (2037 mm / 2645 mm version A/2645 mm version B)
4 longs Multiplets (5628 mm / 6266 mm version A / 6266 mm version B/ 6904 mm)
X 24
X 6
X 23
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

5. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
For the magnetics measurements, 4 devices are necessary to conceive and to produce.
The Streched Wire
The Magnetic Measuring Head
The Mapper 3D
The Translating Fluxmeter.
Design of these devices in charge of EN-MME-EDS.
F.COTTENOT, C.MUCHER, G.VILLIGER
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

6. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
The Streched Wire
Principle n°2
A wire powered by a lower alternative electrical current, in a magnetic field is excited to vibrate in its natural frequency. (resonance frequency, Lorentz force)
Variation of the electrical current
Principle n°1
A wire in a magnetic field is subject to an electrical voltage
proportional to the variation of the magnetic field.
Movement of the wire
U1 = f(B1)
∆B → U=0
U2 = f(B2)
Trolleys for Transport/Handling and Regulating.
H and V Linear Stages
Stroke 400 mm, Δ = +/- 5 microns
Streched Wire Device
Quadrupole
The wire is used to measure:
the real position of the magnetic center (= the smallest oscillation)
the variation of the magnetic field in function of the harmonic analysis,
so the magnetic default.
The wire is used to measure:
the integral of the magnetic field that a particle met in a linear trajectory.
the real position of the magnetic center.
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

7. F Lorentz B I e The Mapper 3d
This device is used to have a magnetic 3d mapping.
3D PROBE (= 3 HALL SENSORS)
THE HALL SENSOR
F Lorentz B I e
PCB
B = f(U)
ANGULAR REGULATING SYSTEM OF THE ARM
FOR COMPENSATING THE DEFLEXION (Δ= +/ mm / F = 15 mm)
Optimized Carbon Arm
L = 3400 mm
Rigid Mobile Table
BUSCH Microsystem
Strokes 1 m /1 m/ 3 m
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

8. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
The Magnetic Measuring Head
U = f(B) B
U = 0 B
Principle
A passive coil in a magnetic field is subject to an electrical voltage proportional to the variation of the magnetic field.
Movement of the coil
U = f(B1-k.B2)
U = f(B)
Défaut magnétique ∆B
= 1/1000 de B
Precisions for coils obtained by winding of multistranded strip (16 layers of 16 strands) :
∆ Design/Manufacturing: mm (Amagnétic materials)
∆ Peering & Calibration of the coils: mm2
∆ Measure: ∆B/B =10-5.
New process : coils produced via a PCB (Printed Circuit Board)
DC Motor + encoder : 15 à points/tr
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

9. Manufacturing Quality Homogeneity of the PCB coils.
The Printed Circuit Board
Several steps for obtaining the coils:
Printing of several circuits (= layer of coils) on each prepreg strip (100 μ + 35 μ)
Stacking of the strips and ovening.
X Ray Scanning for optimizing the positions of the holes to drill (for the targets and the pins)
X Ray Scanning for checking the good superposition.
Drilling of the holes and tinning for the electrical connexions.
Manufacturing Quality
Same Precision of each layer PCB + Same default of positioning of the layers =
Homogeneity of the PCB coils.
Same shape + Same offset
∆ Measure: ∆B/B =10-6. (X10)
Limits of the PCB solution:
The feasibility (size of the printing machine) and the cost.
Only possible with the CERN PCB design service!
The quantity of strips to realize the stack.
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

10. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
The Translating fluxmeter
U = f(B) B
U = 0 B
Principle
A passive coil, in a magnetic field, is subject to an electrical voltage proportional to the variation of the magnetic field.
Movement of the coil
What is a Translating Fluxmeter ?
A TF is used in moving a PCB composed of several coils, along the dipole trajectory
in order to obtain several magnetic measurements :
The magnetic field (in flight) on several points of the trajectory.
The integral of the magnetic field viewed by a particle.
The magnetic field 3D reconstruction compare with the theoretical model (Magnetic default)
Some technical data of the FAIR TF
One PCB (150 X 500) composed of 13 coils with 6 possible heights (= 78 trajectories)
The large sizes of the dipoles (L = 2.2 m, Rmag: 12,5 m; ϴmag= 9.75 °) allow the use of a linear trajectory.
Useful stroke: 4 m / Acceleration-deceleration strokes: 30 mm / Speed: 0.7 m/s/ ∆ for the guides +/- 0.2 mm.
PCB trolley positions known with an optical coder (and targets).
PCB Trolley fixed on a stretched cable and drived by and a stepper motor.
Aluminium plate: 330 mm X 5200 mm X 15 mm
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

11. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER
In the Workstation in building 180
3 benches are under construction to allow:
The integration of all multiplets/dipoles
The independent activation of each superconducting magnet.
The using of each magnetic devices.
cryogenic, control, electricity, pneumatic, vacuum, permanent steel structure, removable platforms, alignment, logistic, handling, safety …
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

12. Magnetic Measurements
The configurations
Bench n°1
Bench n°2
Bench n°3
Magnetic Measurements
Multiplets
M 2037 mm
M 2645 mm A
M 2645 mm B
M 5628 mm
M6266 mm A
M 6266 mm B
M 6904 mm
Streched Wire
Magnetic Center
Integral of B for a particle
Magnetic Head
Integral B
Magnetic default
Dipole A
Dipole B
Translating
Fluxmeter
Local B
Integral Mapping of B
Mapper 3D
3 Benches
7 Multiplets/ 2 Dipoles
4 Magnetic Devices
37 configurations to verify
6 Short Multiplets
23 Long Multiplets
24 Dipoles
Total: ≈ 190 magnets to measure.
15/09/2017
Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER