Conference Presentation (Invited)

FZJ-2023-01572

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Crystof: A thermal spectrometer for HBS

Voigt, J.FZJ*

2023

Abstract: At JCNS we develop a technical design for a future high brilliance neutron source HBS. The very compact design of the neutronsource allows to extract larger phase space volumes from the neutron moderators as compared to existing facilities, where theminimum distance between the moderator and extraction system and/or first choppers poses a significant constraint. In thispresentation we discuss a concept for a compact hybrid chopper spectrometer, that images the neutron source via a large crystalmonochromator onto the sample. The monochromator provides a narrow wavelength resolution also for short wavelength, whichis difficult to realize at long pulse and continuous neutron sources. The secondary wavelength is resolved by a chopper close tothe sample and the time-of-flight to the detector, leading to the name “Crystof” for this spectrometer. The instrument is optimizedfor neutron energy loss scattering in the energy range between 10 and 100 meV resulting in a compact secondary spectrometerthat allows large solid angle coverage at acceptable cost for the detector system. We will compare the performance of such aconcept to existing thermal time of flight spectrometers. This work is part of the collaboration within ELENA and LENS on thedevelopment of HiCANS.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. High Brilliance Source (JCNS-HBS)

Research Program(s):

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

Appears in the scientific report 2023

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