High temperature furnace for small-angle neutron scattering instrument at J-PARC

Abstract

We recently designed and developed a furnace for small-angle neutron scattering, enabling small-angle neutron scattering data with a very low background level to be obtained. The furnace consists of an internal heater and external vacuum chamber. The internal heater consists of an alumina tube around which a heating coil is wound. There are two open windows in the alumina tube for the incident and scattered neutron beams. In the vacuum chamber, there are two aluminium windows of thickness 0.5 mm. As a result, only these aluminium windows are in the path of the beam, and the background scattering from elements other than the sample is significantly reduced in the detected signals. The opening angle for the scattered beam is ±15°. This is adequate for the small-angles detector bank in TAIKAN (BL15) at the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC).

Keywords

High temperature furnace small-angle scattering instrument low background aluminium window

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References

http://mlfuser.cross-tokai.jp/en/bl15.html.

https://www.ill.eu/users/support-labs-infrastructure/sample-environment/services-for-advanced-neutron-environments/history/high-temperatures/.

https://www.ill.eu/users/support-labs-infrastructure/sample-environment/equipment/high-temperature-facilities/furnaces-instruments/.

https://neutrons.ornl.gov/sample/item/hot-f.

Blétry,

Tavernière,

Senillou,

Desré,

Maret and

Chieux, High temperature furnaces for small and large angle neutron scattering of disordered materials, Revue Phys. Appl.19 (1984), 725. doi:10.1051/rphysap:01984001909072500.

For details of anodic oxidation process on aluminium surface, see, for example, https://www.nacl.co.jp/en/alumite/.

High-resistivity iron-chromium-aluminium alloys. For the details, see the website of KANTHAL, https://www.kanthal.com/en/products/materials-in-wire-and-strip-form/wire/resistance-heating-wire-and-resistance-wire/.

J.F.

Jal,

Guiraud,

Chieux and

Dupuy, A high-temperature furnace for small-angle neutron scattering, J. Phys. E10 (1977), 977. doi:10.1088/0022-3735/10/10/010.

Kawakita

et al., Anomaly of structural relaxation in complex liquid metal of bismuth – Dynamic correlation function of coherent quasi-elastic neutron scattering, Physica B551 (2018), 291–296. doi:10.1016/j.physb.2017.12.037.

10.

Nakamura

et al., Oscillating radial collimators for the chopper spectrometers at MLF in J-PARC, JPS Conf. Proc.8 (2015), 036011. doi:10.7566/JPSCP.8.036011.

11.

V.F.

Sears, Neutron scattering length and cross-sections, Neutron News3 (1992), 26–37. doi:10.1080/10448639208218770.

12.

Takata

et al., The design and q resolution of the small and wide angle neutron scattering instrument (TAIKAN) in J-PARC, JPS Conf. Proc.8 (2015), 036020. doi:10.7566/JPSCP.8.036020.