Introduction MM FAIR Project

1. Introduction MM FAIR Project Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

2. 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. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

3. 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) https://www.youtube.com/watch?time_continue=198&v=OzeOkrbLIQQ • 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. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

4. 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 Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

5. 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 Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

6. The Streched Wire • 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 • 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 U1 = f(B1) ∆B → U=0 U2 = f(B2) H and V Linear Stages Stroke 400 mm, Δ = +/- 5 microns 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. Streched Wire Device Trolleys for Transport/Handling and Regulating. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

7. 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= +/- 0.05 mm / F = 15 mm) Optimized Carbon Arm L = 3400 mm Rigid Mobile Table BUSCH Microsystem Strokes 1 m /1 m/ 3 m Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

8. The Magnetic Measuring Head • 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 = 0 U = f(B) U = f(B) Défaut magnétique ∆B = 1/1000 de B B U = f(B1-k.B2) B • Precisions for coilsobtained by winding of multistrandedstrip (16 layers of 16 strands) : • ∆ Design/Manufacturing: 10-2 mm (Amagnéticmaterials) • ∆ Peering & Calibration of the coils: 2.10-4 mm2 • ∆ Measure: ∆B/B =10-5. • New process : coils produced via a PCB (Printed Circuit Board) • DC Motor + encoder : 15 à 20000 points/tr Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

9. 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. Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

10. The Translating fluxmeter • 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/ ∆ forthe guides +/- 0.2 mm. • PCB trolley positions known with an optical coder (and targets). • PCB Trolley fixed on a stretched cable and drivedby and a stepper motor. • Aluminium plate: 330 mm X 5200 mm X 15 mm U = 0 U = f(B) B B Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

11. 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 … Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER

12. The configurations Introduction - MM FAIR Project - F.COTTENOT G.VILLIGER