This title appears in the Scientific Report : 2022 
VITESS simulation and virtual experiment of the neutron diffractometer for small samples at the High Brilliance Neutron Source
MA, Zhanwen
LIEUTENANT, Klaus / VOIGT, Jörg / SCHRADER, Tobias E. / GUTBERLET, Thomas / BRÜCKEL, Thomas
Streumethoden; JCNS-2
JCNS-FRM-II; JCNS-FRM-II
JARA-FIT; JARA-FIT
Streumethoden; PGI-4
High Brilliance Source; JCNS-HBS
2022
JCNS WORKSHOP 2022 TRENDS AND PERSPECTIVES IN NEUTRON SCATTERING: EXPERIMENTS AND DATA ANALYSIS IN THE DIGITAL AGE, Evangelische Akademie Tutzing (Germany), 2022-10-11 - 2022-10-14
Conference Presentation
Jülich Centre for Neutron Research (JCNS) (FZJ)
Materials – Quantum, Complex and Functional Materials


For the sustainable development of the neutron community in Europe and Germany, the High Brilliance Neutron Source (HBS) has been proposed at the Julich Center for Neutron Science (JCNS) [1]. The accelerator, target, and moderators of HBS have been optimized to achieve a high moderator surface peak brilliance comparable to a medium flux reactor source or medium power spallation sources [2]. The instruments are optimized by Monte-Carlo simulations to make full use of the high brilliance and high flexibility of the HBS. The low dimensional moderators of HBS are well suited for the investigation of small samples [3]. For example, in neutron macromolecular crystallography, typical sample volumes reach from 0.01 mm3 to 1 mm3 [4]. As the scattered signal is small, special care must be taken to keep the instrumental background extremely low. In this work, the design progress of a macromolecular diffractometer, including the optimization of the instrument and the evaluation of the virtual experiments, will be presented. By tailoring a small, appropriately collimated beam far upstream of the sample position, we can obtain a low background tunable neutron beam at a 1 mm2 sample with a flux comparable to the existing instruments at spallation neutron sources or reactor sources. [1] T. Gutberlet et al., “The Jülich high brilliance neutron source project – Improving access to neutrons,” Phys. B Condens. Matter, vol. 570, no. December 2017, pp. 345– 348, (2019). [2] T. Brückel et al., “Conceptual Design Report Jülich High Brilliance Neutron Source ( HBS ),” Forschungszentrum Jülich GmbH, (2020). [3] T. Cronert et al., “High brilliant thermal and cold moderator for the HBS neutron source project Jülich,” J. Phys. Conf. Ser., vol. 746, no. 1, (2016). [4] M. P. Blakeley and A. D. Podjarny, “Neutron macromolecular crystallography,” Emerg. Top. Life Sci., vol. 2, no. 1, pp. 39–55, (2018).