The ITE possesses extensive expertise in the design, simulation, and measurement of electromagnetic fields. Its work focuses particularly on applications in neutron research, where the knowledge about precise magnetic fields is essential for magnetic shielding and for magnetic components to guide the fields.
Key competences include:
Design and analysis of magnetic fields generated by electric currents or permanent magnets
Simulation and modeling (FEM, BEM, analytical methods)
Experimental measurements and validation of magnetic components
Magnetically shielded room (MSR) in Oak Ridge, TN
A prominent example is the magnetically shielded room (MSR) designed for the Neutron Spin-Echo Spectrometer (NSE) at the Spallation Neutron Source (SNS) in Oak Ridge, USA. The goal was to create a magnetically silent environment for highly sensitive neutron measurements. The system consists of multiple layers of high-permeability steel, and its shielding performance was modeled in advance using FEM and BEM methods. The resulting MSR is one of the largest of its kind worldwide.
A more recent project is the analytical analysis of shaft movement of the target monitor plug for the ESS, Lund.
Copyright: — U. Giesen, ITE, interne Dokumentation
Target Monitor Plug for ESS
The target monitor plug (TMP) is a crucial component of the ESS target, whose position is to be monitored with optical sensors during operation to avoid collisions with the structural materials. A numerical method has been implemented to derive the exact orientation of the TMP from the measured optical data.
Over the years ITE develops and analyzes magnetic field systems for the adiabatic guidance of polarized neutron beams:
Starting from the neutron guide with vertical spin orientation, a combination of permanent magnets and coils provides a magnetic field of about 1 mT in any direction at the sample for the incoming neutrons. The scattered neutrons are adiabatically led to the analyzer magnet, traversing the field of a smaller ring magnet, which supersedes the zero crossing of the vertical field due to the large analyzer magnet. Copyright: — Dr. H. Soltner, ITE, interne Dokumentation
The strong magnetic field is required for the supermirrors in order to polarize the neutron beam. This requirement is fulfilled by an Aubert-type magnet from permanent magnets, which yields a longitudinal field of more than 20 mT along the flight direction. The figure shows a first prototype of such an Aubert-type magnet with reduced opening angle. The full system will later on accept neutrons within a much larger vertical angle and a horizontal angle of even 160°. Copyright: — Dr. H. Soltner, ITE; interne Dokumentation
T-REX
POLI
KOMPASS
The guide fields for the T-REX experiment heavily rely on Halbach rings constructed with permanent magnets. They can be stacked along the flight path of the neutrons to ensure adiabatic transport from the neutron guide to the sample. Copyright: — O. Gernhardt, ITE; interne Dokumentation
Magnetic rings do not only provide a static guide field for neutrons, but may also rotate the spin orientation, when gradually changing their field direction along the neutron path. This device consist of three subunits, which can be rotated independently about a common axis to choose any spin orientation at the exit perpendicular to the flight path. With an additional solenoid, the neutron spins may be manipulated to even align with the forward direction. Copyright: — Dr. H. Soltner, ITE, interne Dokumentation
Triple-coil configurations optimized for field control with minimum power consumption.Copyright: — Dr. H. Soltner, ITE, interne Dokumentation
