Conference Presentation (Invited)

FZJ-2020-02362

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Considerations about guide configuration of the TOF diffractometer at high brilliance source

Ma, Z.FZJ* ; Lieutenant, K.FZJ* ; Voigt, J.FZJ*

2020

Abstract: A time of flight diffractometer for the study of the nanoscale and disordered materials samples with a high neutron flux is envisioned for the HBS. To transfer neutrons from moderator to sample over a long-distance effectively, several neutron guide systems, including a truly elliptical guide and ballistic guides with elliptical diverging and focusing sections were studied via Monte-Carlo simulation, varying the moderator to guide distance and the guide entry cross section. The neutron flux, spatial distribution, and divergence distribution and brilliance transfer ratio with different guide shape geometries were calculated and discussed. Simulation results indicate that a well-designed ballistic guide system can achieve a comparable neutron flux (96.3% of the true elliptical guide system) and brilliance transfer ratio compared to the true elliptical guide.

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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. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Appears in the scientific report 2020

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