Universität zu Köln

Gorkov, D. ORCID: 0000-0002-5983-2771, Müller, M., Waldherr, G., Grünwald, A. ORCID: 0000-0002-9399-5793, Stein, J. ORCID: 0000-0001-7136-5419, Giemsa, S., Komarek, A.C. ORCID: 0000-0002-0084-4698, Böni, P. ORCID: 0000-0001-6469-5428 and Braden, M. ORCID: 0000-0002-9284-6585 (2025). KOMPASS: The new cold neutron triple-axis-spectrometer specialized for polarization analysis. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1080. pp. 1-15. Elsevier. ISSN 0168-9002

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Abstract

[Artikel Nr.: 170719] 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.

Item Type:	Article
Creators:	Creators Email ORCID ORCID Put Code Gorkov, D. UNSPECIFIED https://orcid.org/0000-0002-5983-2771 UNSPECIFIED Müller, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Waldherr, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grünwald, A. UNSPECIFIED https://orcid.org/0000-0002-9399-5793 UNSPECIFIED Stein, J. UNSPECIFIED https://orcid.org/0000-0001-7136-5419 UNSPECIFIED Giemsa, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Komarek, A.C. UNSPECIFIED https://orcid.org/0000-0002-0084-4698 UNSPECIFIED Böni, P. UNSPECIFIED https://orcid.org/0000-0001-6469-5428 UNSPECIFIED Braden, M. UNSPECIFIED https://orcid.org/0000-0002-9284-6585 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-805585
Identification Number:	10.1016/j.nima.2025.170719
Journal or Publication Title:	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume:	1080
Page Range:	pp. 1-15
Number of Pages:	15
Date:	November 2025
Publisher:	Elsevier
ISSN:	0168-9002
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	Physics
Uncontrolled Keywords:	Keywords Language Neutron instrumentation ; Triple-axis spectrometer ; Polarization analysis ; McStas ; Neutron optics ; Polarizing V-cavity English
['eprint_fieldname_oa_funders' not defined]:	Publikationsfonds UzK
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/80558