Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations

A. C. Komarek; P. Böni; M. Braden

doi:10.1016/j.nima.2011.04.022

Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations

A. C. Komarek, P. Böni, M. Braden

Natural Sciences

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

We present Monte-Carlo simulations for the focusing design of a novel cold-neutron triple-axis spectrometer to be installed at the end position of the cold guide NL-1 of the research reactor FRM-II in Munich, Germany. Our simulations are of general relevance for the design of triple-axis spectrometers at end positions of neutron guides. Using the McStas program code we performed ray trajectories to compare parabolic and elliptic focusing concepts. In addition the design of the monochromator was optimized concerning crystal size and mosaic spread. The parabolic focusing concept is superior to the elliptic alternative in view of the neutron intensity distribution as a function of energy and divergence. In particular, the elliptical configuration leads to an inhomogeneous divergence distribution.

Original language	English
Pages (from-to)	63-72
Number of pages	10
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	647
Issue number	1
DOIs	https://doi.org/10.1016/j.nima.2011.04.022
State	Published - 11 Aug 2011

Keywords

Elliptic
Focusing
McStas
Neutron guide
Parabolic
Supermirror
Triple-axis spectrometer

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10.1016/j.nima.2011.04.022

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Komarek, A. C., Böni, P., & Braden, M. (2011). Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 647(1), 63-72. https://doi.org/10.1016/j.nima.2011.04.022

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title = "Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations",

abstract = "We present Monte-Carlo simulations for the focusing design of a novel cold-neutron triple-axis spectrometer to be installed at the end position of the cold guide NL-1 of the research reactor FRM-II in Munich, Germany. Our simulations are of general relevance for the design of triple-axis spectrometers at end positions of neutron guides. Using the McStas program code we performed ray trajectories to compare parabolic and elliptic focusing concepts. In addition the design of the monochromator was optimized concerning crystal size and mosaic spread. The parabolic focusing concept is superior to the elliptic alternative in view of the neutron intensity distribution as a function of energy and divergence. In particular, the elliptical configuration leads to an inhomogeneous divergence distribution.",

keywords = "Elliptic, Focusing, McStas, Neutron guide, Parabolic, Supermirror, Triple-axis spectrometer",

author = "Komarek, {A. C.} and P. B{\"o}ni and M. Braden",

note = "Funding Information: This work was supported by the German Federal Ministry of Education and Research (BMBF) by project 05KN7PK1. We thank A. Ostermann for providing the model of the cold source and the cold guide NL-1 of the FRM-II up to the upstream instrument N-REX + . We thank M. Janoschek for providing the optimized guide parameters of the elliptic guide.",

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Komarek, AC, Böni, P & Braden, M 2011, 'Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 647, no. 1, pp. 63-72. https://doi.org/10.1016/j.nima.2011.04.022

Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations. / Komarek, A. C.; Böni, P.; Braden, M.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 647, No. 1, 11.08.2011, p. 63-72.

Research output: Contribution to journal › Article › peer-review

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AU - Komarek, A. C.

AU - Böni, P.

AU - Braden, M.

N1 - Funding Information: This work was supported by the German Federal Ministry of Education and Research (BMBF) by project 05KN7PK1. We thank A. Ostermann for providing the model of the cold source and the cold guide NL-1 of the FRM-II up to the upstream instrument N-REX + . We thank M. Janoschek for providing the optimized guide parameters of the elliptic guide.

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KW - Elliptic

KW - Focusing

KW - McStas

KW - Neutron guide

KW - Parabolic

KW - Supermirror

KW - Triple-axis spectrometer

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IS - 1

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Parabolic versus elliptic focusing - Optimization of the focusing design of a cold triple-axis neutron spectrometer by Monte-Carlo simulations

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Keywords

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