polarizing devices
V shape cavity - RESEDA FRM-II
The resonance spin echo RESEDA utilizes a V shape cavity in front of the instrument to supply a polarized neutron beam. This component is a straight guide unit with silicon wafers inserted in the shape of a V covering the complete width of the beam. The wafers are coated with polarizing Fe/Si supermirrors (m = 3) which select the neutrons according their spin. One spin state is reflected out of the beam and is absorbed in the Borofloat substrate of the side walls. The other spin state is transmitted to the instrument.
- type: V shape cavity polarizer
- path/profile: straight
- cross-section: 36.7 x 36.7mm˛
- length: 2000mm
- coating: Fe/Si, m = 3; non-magn. Ni/Ti, m = 1.2
- substrate: Si-wafer (300 µm), Borofloat
polarizing bender - JRR-3M
The compact polarizing beam bender comprises 23 thin glass vanes (0.2 mm) which are bent to a radius of 24m. The vanes are coated with polarizing FeCoV/TiN supermirrors. In order to suppress total reflection of neutrons from the substrate an absorption layer is initially deposited. Permanent magnets are incorporated in the casing to provide the vertical guide field.
- type: multi-channel polarizing bender – 22 channels
- path/profile: truly curved - R = 24m
- cross-section: 20 x 20mm˛
- length: 440mm
- coating: FeCoV/TiN, m = 2.8
- substrate: 0.2 mm glass vanes
- aluminum / soft iron casing with permanent magnets incorporated
