An ultra-compact in-situ 3 He polarizer for high Q-range SANS: on-beam test and future upgrades

Salhi, Zahir; Bingöl, Kendal; Radulescu, Aurel; Starostin, Denis; Ioffe, Alexander; Babcock, Earl; Lumma, Nils; Pistel, Patrick

doi:10.1088/1742-6596/862/1/012022

Journal Article

FZJ-2018-00749

An ultra-compact in-situ 3 He polarizer for high Q-range SANS: on-beam test and future upgrades

Salhi, Z. (Corresponding author)FZJ* ; Babcock, E.FZJ* ; Bingöl, K.FZJ* ; Starostin, D. ; Pistel, P.FZJ* ; Lumma, N.PGI-JCNS-TA* ; Radulescu, A.FZJ* ; Ioffe, A.FZJ*

2017
IOP Publ. Bristol

Journal of physics / Conference Series 862, 012022 - (2017) [10.1088/1742-6596/862/1/012022]

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Please use a persistent id in citations: http://hdl.handle.net/2128/17595 doi:10.1088/1742-6596/862/1/012022

Abstract: We present an ultra-compact 3He polarizer to be used as a polarization analyzer for separation of incoherent background for soft matter research. The 3He will be polarized in-situ within a very compact, 18 cm long, magnetic cavity that can be placed between the sample and the detector tank of small-angle scattering diffractometer KWS2 at MLZ [1]. This allows for the angular coverage of 38°, that corresponds to the maximal momentum transfer Qmaxλ=0.85 Å−1 for neutrons with wavelength λ=4.5Å. The Qmax can be extended to 1.28 Å−1 following the recent upgrade of KWS2 for neutron wavelength λ=3Å. The optical pumping will be done by the diode laser array bar frequency narrowed by the ultra-compact volume Bragg grating. The full system will be readily hand transportable and thus useful as an instrument add-on.

Keyword(s): Instrument and Method Development (1st) ; Instrument and Method Development (2nd)

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