Poster (After Call)

FZJ-2026-01443

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Development of a new Macromolecular Instrument at the High Brilliance Neutron Source in Jülich

Schrader, T. E. (Corresponding author)FZJ* ; Jialian, H.FZJ* ; Konik, P. (Contributor)Extern*

2025

Abstract: Neutron protein crystallography requires a highly brilliant beam in order to measure very small biological single crystals, which typically measure between 0.01 and 1 mm³. Additionally, these crystals have a large unit cell size, which may be as large as 200 Å in at least one dimension. This makes it challenging for neutron beamlines to accommodate this type of measurement. The Jülich High Brilliance Neutron Source is a potential future source of neutrons for Germany. As part of this project, the design and simulation of a macromolecular diffractometer at the 24 Hz TMR station with a conventional 80 m long neutron guide using a cold moderator is planned. An optimized elliptical guide was developed for a neutron bandwidth of 2-4 Å. Simulations suggest that the 80 m instrument will have a flux of 3.3×106 n/s/cm² and a brilliance transfer of 91.7% within a divergence of ±0.4°. Furthermore, it is proposed that the diameter of the smallest moderator should be 14 mm.

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

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Contributing Institute(s):

1. JCNS-4 (JCNS-4)
2. JCNS-FRM-II (JCNS-FRM-II)
3. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. BIODIFF: Diffractometer for large unit cells (NL1)

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