Realization of an advanced super-mirror solid-state neutron polarizer for the instrument PF1B at the Institut Laue-Langevin
arXiv:2208.14305 · doi:10.1063/5.0123419
Abstract
In this last of a series of three papers on the development of an advanced solid-state neutron polarizer, we present the final construction of the polarizer and the results of its commissioning. The polarizer uses spin-selective reflection of neutrons by interfaces coated with polarizing super-mirrors. The polarizer is built entirely in-house for the PF1B cold neutron beam facility at the Institut Max von Laue - Paul Langevin (ILL). It has been installed in the PF1B casemate and tested at real conditions. The average transmission for the "good" spin component is measured to be >30 %. The polarization averaged over the capture spectrum reaches a record value of Pn ~ 0.997 for the full angular divergence in the neutron beam, delivered by the H113 neutron guide, and the full wavelength band lambda of 0.3-2.0 nm. This unprecedented performance is due to a series of innovations in the design and fabrication in the following domains: choice of the substrate material, super-mirror and anti-reflecting multilayer coatings, magnetizing field, assembling process. The polarizer is used for user experiments at PF1B since the last reactor cycle in 2020.
References in corpus (7)
- Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam
- Determination of the Weak Axial Vector Coupling from a Measurement of the Beta-Asymmetry Parameter A in Neutron Beta Decay
- Characterization of a ballistic supermirror neutron guide
- Spin-orbit interaction in final state as possible reason for T-odd correlation in ternary fission
- Measurement of the parity-violating triton emission asymmetry in the reaction 6Li(n,alfa)3H with polarised cold neutrons
- Advanced broad-band solid-state supermirror polarizers for cold neutrons
- A project of advanced solid-state neutron polarizer for PF1B instrument at ILL