Monte-Carlo simulations of a high-resolution inverse geometry spectrometer on the SNS-Long wavelength target station.
It is proposed to build an inverse geometry spectrometer to provide extremely high energy resolution (0.2 {mu}eV FWHM, elastic) at the Long Wavelength Target Station (LWTS) at SNS. The design employs mica analyzers in close to backscattering geometry (final neutron wavelength of 20 Angstroms). Analytical calculations and Monte Carlo simulations (using the McStas package) have been used to optimize the layout of individual components and to estimate the instrument performance. This design requires a long initial guide section of 63 m from moderator to sample in order to achieve the timing resolution necessary for the desired {Delta}{omega}. The LWTS will provide the high flux of long wavelength neutrons at the requisite pulse rate required by the spectrometer design. The resolution of this spectrometer lies between that routinely achieved by spin echo techniques and the design goal of the high power target station backscattering spectrometer. Covering this niche in energy resolution will allow systematic studies over the large dynamic range required by many disciplines. Molecular biology, for example, often requires systematic studies of many similar molecules under slightly different conditions, requiring a large range of energy/timing resolutions for optimum study.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 924994
- Report Number(s):
- ANL/IPNS/CP-103600; TRN: US200807%%131
- Resource Relation:
- Conference: 15th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-XV); Nov 6-9, 2000; Tsukuba, Japan
- Country of Publication:
- United States
- Language:
- ENGLISH
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