Compact magnetostatic cavity for polarised 3He neutron spin filter cells

Spin echo small angle neutron scattering using a continuously pumped 3He neutron polarisation analyser

“…It also keeps the polarisation high to make maximum use of the available neutron flux. Additional modifications could be performed to the 3 He analyser such as using a vertical magnetic field [45], which would have the added advantage of removing the need to have mirrors in the beam and would allow the device to be placed closer to the sample, further increasing the angular acceptance. Also the angular acceptance can be further scaled up by the use of larger cells and/or narrower, higher-power lasers [46].…”

Magnetized boxes for housing polarized spins in homogeneous fields

“…At this point one should mention that these mu-metal components have been properly annealed after machining and welding. A recent publication [33] describes a spin box whose design is based on a variant of the principle of optimized distribution of field sources, originally described in [21]. It is designed as an elongated cuboid with free access from two open sides and is meant for transporting polarized 3 He cells within a laboratory.…”

“…Also a group at Institut Laue-Langevin, Grenoble, France (ILL) has recently reported on a current powered spin box which is suited for local transport of polarized 3 He within the lab [33]. Following design principles described in Section 5.2, it concerns a rectangular mu-metal box.…”

“…Following design principles described in Section 5.2, it concerns a rectangular mu-metal box. For reasons of convenience, however, it is fully open on two opposite sides like in the case of the permanently magnetized, so called ''magic box" being also in use at ILL [33]. Coils are spooled around two of the walls, the other two serve as pole faces.…”

Study of spin-exchange optically pumped 3He cells with high polarisation and long lifetimes

“…We have constructed a new magneto-static cavity based on the design concept of the ILL 'magic box' [22]. The dimensions of which were 20 cm wide 60 cm high and 70 cm long, with a change in design from previous boxes such that the field is along the long (60 cm) axis of the device, the solenoid windings produced a field of % 10 G. This modification gives more space along the field axis and enables the laser to be used in situ and optical pumping to be performed orthogonal to the neutron beam, minimising the amount of material in the beam.…”