Magnetic design, modelling and measurements
Our group owns a software for 2D/3D magneto-static calculations, and magnetic measurements systems. We also have expertise in magnetic fields analytical calculus.
We use OPERA with the magneto-static module for the modelling of magnets. OPERA is considered as a reference and widely used in French laboratories of CNRS/IN2P3, such as LAL, IPN Orsay or GANIL, and at CERN. OPERA was used in the design of all the magnets of the medical accelerators CNAO (Italy) and MedAustron (Austria).
OPERA consists of a series of modules for electric and magnetic calculations, in static, quasi-static or dynamic modes. The models designed at LPSC can be easily transferred to other modules.
Steerers for the solenoid sets of the Low Energy Beam line for MYRRHA.
Steel core of the solenoid of the PEPPo experiment
Magnetic measurement systems
The group owns recent magnetic measurement instruments from LakeShore consisting in 3 hall probes : one axial (300 at 3×105 G), one transverse (300 at 3×105 G) and a 3-axis probe (30 at 3×104 G).
These hall probes are used the corresponding LakeShore high quality Gauss-meter, which allows to reach the precision of 3,33×10-6 with filtering, or 3,33×10-5 without filtering for any range (30 µT at 30 T).
Projects in progress and upcoming
- Solenoid sets with integrated magnetic steerers for the low energy beam line of MYRRHA
The solenoid was designed to fulfil the field levels required for the particles beam dynamics, and the small dimensions requirements. The horizontal and vertical steerers, which allow to rectify the particles trajectories, were integrated in the solenoid to gather all the magnets in a single volume. The field maps drawn from the OPERA 3D model and introduced in the particle beam transport software (Tracewin) gave the expected results. The fabrication of the two solenoid sets is in progress and are expected to be delivered by the end of 2014.
- Modelling of the flux measurements for the solenoid of the PEPPo experiment.
The PEPPo experiment, which aims at the determination of a positron beam polarization rate, operates a solenoid with a low carbon steel core (1010) which has magnetic properties close to those of soft iron.
The polarization directly depends on the magnetic field in the steel core. Incident positrons are collimated at the centre of the solenoid to generate photons that are then detected by a scintillator situated backward of the solenoid. Modelling the experiment properly requires to know the magnetic field in the steel core very accurately. This implies to ensure that the pick-up coils around the steel core give a signal that can be theoretically modelled in the transient mode.
- Superconducting multi-ionized ion source : supervision of magnetic dimensions
- The set-up of a practice bench for Master level students is foreseen. It would use a spiral faces dipole magnet.
Spiral faces dipole provided for the practice bench for Master level students.
The needs of upcoming nuclear physics experiment includes high intensity ion beams, with numerous charge states available. To fulfil this requirement, the increase of the magnetic field intensity in the ion source is necessary, which makes the superconducting technology mandatory. Thanks to our expertise, we will be in charge of the supervision of the magnetism activities of the French project for an ion source of this type.
- A 3D magnetic measurements bench is under study to fulfil increasing local needs. It will operate the LakeShore Hall probes.