CAMEA ESS – The continuous angle multi-energy analysis indirect geometry spectrometer for the European Spallation Source

Freeman, P. G.; Birk, Jonas Okkels; Markó, Márton; Bertelsen, Mads F.; Larsen, Jacob; Christensen, Niels Bech; Lefmann, Kim; Jacobsen, J. C.; Niedermayer, Ch.; Jurányi, Fanni; Rønnow, Henrik M.

doi:10.1051/epjconf/20158303005

Cited by 23 publications

(18 citation statements)

References 17 publications

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“…A way of increasing the mapping capabilities even further is employing a successive arrangement of vertically scattering analyzer crystals accepting multiple final energies E f in a single θ 2 channel. This has become known as the Continuous Angle Multiple Energy Analysis (CAMEA) backend [15,16], and is possible due to the transparency of highly oriented pyrolytic graphite (HOPG) at large wavelengths [17]. This type of backend is under construction for the RITA-II cTAS at the PSI [16] and under consideration for the PANDA cTAS [18][19][20] at the MLZ facility [21].…”

Section: Introductionmentioning

confidence: 99%

“…This type of backend is under construction for the RITA-II cTAS at the PSI [16] and under consideration for the PANDA cTAS [18][19][20] at the MLZ facility [21]. In addition, this setup is to be utilized in the high performance indirect ToF spectrometer BIFROST to be built at the ESS [15]. As a BIFROST prototype the CAMEA concept has already been successfully tested on a ToF frontend [22].…”

Section: Introductionmentioning

confidence: 99%

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Experimental characterization of a prototype secondary spectrometer for vertically scattering multiple energy analysis at cold-neutron triple axis spectrometers

Toft-Petersen

Groitl

Kure

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tA thorough experimental characterization of a multiplexing backend with multiple energy analysis on a cold-neutron triple axis spectrometer (cTAS) is presented. The prototype employs two angular segments ( θ 2 -segments) each containing five vertically scattering analyzers (energy channels), which simultaneously probe an energy transfer range of 2 meV at the corresponding two scattering angles. The feasibility and strength of such a vertically scattering multiple energy analysis setup is clearly demonstrated. It is shown, that the energy resolution near the elastic line is comparable to the energy resolution of a standard cTAS. The dispersion relation of the antiferromagnetic excitations in MnF 2 has been mapped out by performing constant energy transfer maps. These results show that the tested setup is virtually spurion free. In addition, focusing effects due to (mis)matching of the instrumental resolution ellipsoid to the excitation branch are clearly evident.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental characterization of a prototype secondary spectrometer for vertically scattering multiple energy analysis at cold-neutron triple axis spectrometers

Toft-Petersen

Groitl

Kure

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…17, fully understanding such behavior requires complementary high P measurements of the magnetic excitation spectrum to determine the P evolution of the interactions. Such a study may be achievable with the high P PE press setup, and making use of developments in instrumentation for inelastic neutron scattering on small samples [30].…”

Section: Discussionmentioning

confidence: 99%

Stress-induced magnetic domain selection reveals a conical ground state for the multiferroic phase ofMn2GeO4

et al. 2016

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At ambient pressure P and below 5.5 K, olivine-type Mn2GeO4 hosts a multiferroic (MF) phase where a multi-component, i.e. multi-k magnetic order generates spontaneous ferromagnetism and ferroelectricity (FE) along the c-axis. Under high P the FE disappears above 6 GPa, yet the P evolution of the magnetic structure remained unclear based on available data. Here we report high-P single crystal neutron diffraction experiments in the MF phase at T = 4.5 K. We observe clearly that the incommensurate spiral component of the magnetic order responsible for FE varies little with P up to 5.1 GPa. With support from high P synchrotron x-ray diffraction measurements at room temperature (T ), the P driven suppression of FE is proposed to occur as a consequence of a crystal structure transition away from the olivine structure. In addition, in the low T neutron scattering experiments an emergent non-hydrostatic P component, i.e. a uniaxial stress, leads to the selection of certain multi-k domains. We use this observation to deduce a double-k conical magnetic structure for the ambient P groundstate, this being a key ingredient for a model description of the MF phase.

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“…This multiplexed spectrometer back-end aims at detecting several final energies simultaneously over an extended range of wave vector transfers Q similar to the MultiFLEXX option described here. The CAMEA concept is also proposed for an indirect geometry spectrometer for the future European Spallation Source ESS [15].…”

Section: The Multiflexx Multi-analyzer Optionmentioning

confidence: 99%

The upgraded cold neutron triple-axis spectrometer FLEXX – enhanced capabilities by new instrumental options

Habicht

Quintero-Castro

Toft-Petersen

et al. 2015

EPJ Web of Conferences

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Abstract. The upgrade of the cold neutron triple axis spectrometer FLEXX, a work-horse instrument for inelastic neutron scattering matching the sample environment capabilities at Helmholtz-Zentrum Berlin, has been successfully accomplished. Experiments confirmed an order of magnitude gain in flux now allowing for intensity demanding options to be fully exploited at FLEXX. In this article, we describe the layout and design of two newly available FLEXX instrument options in detail. The new Heusler analyzer gives an increase of the detected polarized neutron flux due to its superior focusing properties, significantly improving the feasibility of future polarized and neutron resonance spin echo experiments. The MultiFLEXX option provides simultaneous access to large regions in wavevector and energy space for inelastic excitations thus adding mapping capabilities to the spectrometer.

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CAMEA ESS – The continuous angle multi-energy analysis indirect geometry spectrometer for the European Spallation Source

Cited by 23 publications

References 17 publications

Experimental characterization of a prototype secondary spectrometer for vertically scattering multiple energy analysis at cold-neutron triple axis spectrometers

Experimental characterization of a prototype secondary spectrometer for vertically scattering multiple energy analysis at cold-neutron triple axis spectrometers

Stress-induced magnetic domain selection reveals a conical ground state for the multiferroic phase ofMn2GeO4

The upgraded cold neutron triple-axis spectrometer FLEXX – enhanced capabilities by new instrumental options

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