Bi-spectral beam extraction in combination with a focusing feeder
Bi-spectral beam extraction combines neutrons from two different kinds of moderators into one beamline, expanding the spectral range and thereby the utilization of an instrument. This idea can be realized by a mirror that reflects long wavelength neutrons from an off-axis colder moderator into a neu...
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| Veröffentlicht in: | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2013-03, Vol.704, p.68-75 |
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| container_title | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment |
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| creator | Zendler, C. Lieutenant, K. Nekrassov, D. Cussen, L.D. Strobl, M. |
| description | Bi-spectral beam extraction combines neutrons from two different kinds of moderators into one beamline, expanding the spectral range and thereby the utilization of an instrument. This idea can be realized by a mirror that reflects long wavelength neutrons from an off-axis colder moderator into a neutron guide aligned with another moderator emitting neutrons with shorter wavelengths which will be transmitted through the mirror. The mirror used in such systems is typically several meters long, which is a severe disadvantage because it reduces the possible length of a focusing device in design concepts requiring a narrow beam at a short distance from the source, as used in many instruments under development for the planned European Spallation Source (ESS). We propose a shortened extraction system consisting of several mirrors and show that such an extraction system is better suited for combination with a feeder in an eye of the needle design, illustrated here in the context of a possible ESS imaging beamline. |
| doi_str_mv | 10.1016/j.nima.2012.11.180 |
| format | Article |
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| identifier | ISSN: 0168-9002 |
| ispartof | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 2013-03, Vol.704, p.68-75 |
| issn | 0168-9002 0167-5087 1872-9576 |
| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Accelerator Physics and Instrumentation Acceleratorfysik och instrumentering Beams (radiation) Bi-spectral beam extraction Design engineering European Spallation Source Extraction Feeders Focusing Fysik instrumentation Moderators Multi-spectral beam extraction Natural Sciences Naturvetenskap Neutron Neutron instrumentation Particle physics Physical Sciences Supermirror VITESS Wavelengths |
| title | Bi-spectral beam extraction in combination with a focusing feeder |
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