Journal Article

IMPULSE-2025-00137

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png KOMPASS: The new cold neutron triple-axis-spectrometer specialized for polarization analysis

Gorkov, D. (Corresponding author)MLZ* ; Müller, M. ; Waldherr, G.MLZ* ; Grünwald, A. ; Stein, J. ; Giemsa, S.MLZ* ; Komarek, A. C. ; Boeni, P.MLZ* ; Braden, M.

2025
Elsevier [Amsterdam]

Please use a persistent id in citations: doi:10.1016/j.nima.2025.170719

Abstract: KOMPASS is a polarized triple-axis cold neutron spectrometer recently installed at the neutron source FRM II (Garching, Germany). The instrument is designed to operate exclusively with polarized neutrons and is specialized in longitudinal polarization analysis using Helmholtz coils and spherical zero-field neutron polarimetry using a Cryopad device. The advanced guide system polarizes and focuses flexibly in the scattering plane. A first, fixed parabolic focusing part contains a series of three polarizing supermirror V-cavities that produce a highly polarized beam. By exchanging straight and parabolic front-end guide sections, the resolution of the instrument can be optimized to meet experimental requirements. Large, double-focusing monochromator and analyzer units with pyrolytic graphite crystals enable efficient and adaptive energy selection, and a compact supermirror cavity analyzes the final neutron polarization. Alternatively, or in combination with this cavity, a Heusler polarization analyzer can be used. KOMPASS offers full- and half-polarized configurations with or without secondary energy analysis and provides a wide range of polarization options. Therefore, KOMPASS is well suited for various studies of static and dynamic magnetic correlations with energy transfers on the neutron energy loss side up to 12 meV.

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

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Contributing Institute(s):

1. KOMPASS (KOMPASS)

Experiment(s):

1. KOMPASS: Cold three axes spectrometer with polarization analysis (NL1)

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; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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