Browsing by Author "Jullien, D"

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    (3)He polarization for ISIS TS2 phase I instruments
    (Elsevier, 2011-06-01) Beecham, CJ; Boag, S; Frost, CD; McKetterick, TJ; Stewart, JR; Andersen, KH; Bentley, PM; Jullien, D
    Here we report on the development of polarization analysis (PA) techniques to be employed at the ISIS pulsed neutron source second target station. Both spin exchange optical pumping and metastability exchange optical pumping techniques are being developed at ISIS to produce polarized neutron spin filters for use as neutron polarizers and analysers. We focus on the developments of a polarization solution on the LET spectrometer, including the updated design of the PASTIS XYZ coil set and single crystal silicon analyser cell. We also report on the construction of a combined polarizer/analyser solution for the WISH diffractometer. (C) 2010 Elsevier B.V.
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    Polarised 3He based neutron polarisers and analysers for magnetism research on ANSTO instruments
    (Australian Institute of Physics, 2012-02-02) Lee, WT; Klose, F; Jullien, D; Andersen, KH
    Polarised 3He based neutron polariser and polarization analyser [1] have become a matured technology for polarised neutron experimental works. A joint project of the Australian Nuclear Science and Technology Organisation (ANSTO) and the Institute Laue Langevin (ILL) is underway to provide 6 OPAL neutron scattering instruments with these important research capabilities. The instruments include SANS Quokka, diffractometer Wombat, thermal triple-axis spectrometer Taipan, reflectometer Platypus, Taipan’s cold-neutron counterpart Sika, and cold neutron time-of-flight spectrometer Pelican. Discussions are underway to further expand the use to more instruments, including the Laue diffractometer Koala and new instruments that are being designed and constructed. The project will produce a 3He gas polarizing station that uses the Metastable Exchange Optical Pumping method [2]. Silicon-window polarised 3He cells will polarize the incident neutron beam on several instruments and analyse the scattered neutrons on Platypus and Quokka. Wide-angle analyser “Pastis” cells [3] will be used for Wombat and Pelican. The polarizers and analysers are housed in magnetio-static cavities “Magic Box” and “Pastis” uniform field coils. The polarizing station has passed major performance requirements. The equipment for use on instruments are being built and tested for 3He polarisation lifetime, and infrastructural changes are being incorporated on ANSTO instruments. This presentation will provide examples illustrating the use of polarised neutrons to study magnetic materials and explain the methodology for using this technique. The latest status of the polarizing station and test results of the instrument components will be presented.