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BL14 AMATERAS Cold-Neutron Disk-Chopper Spectrometer

Summary

Disk-chopper type neutron spectrometer for studying dynamical properties in atomic, molecular and magnetic systems in the energy range from cold to sub-thermal neutron regions with high efficiency and fine resolution.

Research ObjectivesDiffusion of atoms, ions and molecules in liquids, polymers, biomaterials etc., local and collective excitations and fluctuations of lattice and spins.
FeaturesBy using recently developed techniques such as the pulse-shaping technology and the multi-Ei measurement, AMATERAS carries out quasielastic and inelastic neutron scattering measurements with high efficiency and fine and flexible energy resolution in cold and sub-thermal neutron regions.
AMATERAS is a disk-chopper type spectrometer. The spectrometer is designed to carry out inelastic and quasielastic neutron scattering experiments on single-crystals, powder, liquid and amorphous samples in the range from cold to sub-thermal neutron energy. The most characteristic feature of AMATERAS is that the spectrometer employs the pulse shaping technique. One set of fast-disk choppers located at the upstream position cuts out a sharp and symmetric peak from the source pulse from a coupled moderator at MLF, which has a large intensity but broad and asymmetric pulse shape. AMATERAS also has capability to carry out multi-Ei measurements by using a repetition rate multiplication (RRM) technique, which enhances measuring efficiency. By utilizing these techniques and owing to the high peak intensity from the coupled moderator at MLF, AMATERAS realizes high intensity and fine and flexible energy resolution measurements.

Specification

Last Update: 2018-05-02

InstrumentCold-neutron disk-chopper spectrometer (AMATERAS)
Overview of instrumentInelastic scattering spectrometer for detecting dynamical properties in atomic, molecular and magnetic systems in a relatively low-energy range with high resolution
BeamlineBL14
ModeratorCoupled hydrogen moderator
Incident neutron energy1 < Ei < 80 meV
Detection angleHorizontal: 3.4 deg. - 116 deg.
Vertical: -16 deg. - 23 deg.
Resolution (ΔE/Ei)~1% (minimum) at Ei < 3meV
~2-3% (minimum) at Ei < 20meV
~4-5% ( minimum) at Ei < 80meV.
Neutron intensity (@sample position @1MW)3 ×104 n/s/cm2 (@ Ei = 20 meV, ΔE/Ei = 1 %) (expected)
Sample size and/or volumeOptimal dimensions for beam are 1φ×2 cm
Ancillary equipment and sample environmentBottom-loading closed cycle refrigerator (5-300 K)
Top-loading closed cycle refrigerator (7-300 K)
High-temperature stick (T < 500 K)
Other BL-common equipment is also available.*1 (On AMATERAS, some of equiments can not be used at their full-spec. Please contact BL14 staff members for more detailes.)

Beamline Team

ContactKenji NAKAJIMA (J-PARC Center, JAEA)
Secondary contactSeiko OHIRA-KAWAMURA (J-PARC Center, JAEA)
Maiko KOFU (J-PARC Center, JAEA)
Tatsuya KIKUCHI (J-PARC Center, JAEA/Research & Development HQ., Sumitomo RubberIndustries, Ltd.)

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