Conditions for high resolution in a three-axis curved-ideal-crystal neutron spectrometer

Popovici, M.; Stoica, A. D.

doi:10.1088/0022-3735/16/7/023

Cited by 12 publications

(19 citation statements)

References 5 publications

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“…A matrix method using a particle approach similar to that of Gaussian lens optics was formulated for neutron optics (Popovici & Stoica, 1983;Popovici et al, 1987). The neutron state before diffraction is speci®ed by the spatial coordinates across the beam (y 0 , z 0 ), the angular deviations ( 0 , 0 ) from the beam axis and the relative deviation of the wavevector (Ák 0 /k).…”

Section: Matrix Description Of Diffraction By Deformed Perfect Crystalsmentioning

confidence: 99%

“…A simple lens description of neutron diffraction from a thin curved crystal can be used (Popovici & Stoica, 1983):…”

Section: Matrix Description Of Diffraction By Deformed Perfect Crystalsmentioning

confidence: 99%

“…For point samples, the contributions to resolution of the monochromator and analyzer are not correlated (Popovici & Stoica, 1983). Consider a dispersion surface 3(Q), which connects the neutron wavevectors before and after scattering through the energy and impulse conservation laws.…”

Section: Dispersive Two-crystal Arrangementsmentioning

confidence: 99%

“…The general case is discussed in Appendix A5. For a thick analyzer with a PSD, the relation (33) replaces the condition of high resolution for a thin crystal analyzer (Popovici & Stoica, 1983):…”

Section: Dispersive Two-crystal Arrangementsmentioning

confidence: 99%

“…The relations for high-resolution phonon scattering in threeaxis curved-crystal spectrometry with the usual sequential scans, given previously (Popovici & Stoica, 1983;Popovici et al, 1987), can be extended to the case of simultaneous PSD scans by relations (33) and (35). However, relation (35) is only really of theoretical interest because in phonon scattering the orientation of a plate sample is not a free parameter.…”

Section: Dispersive Two-crystal Arrangementsmentioning

confidence: 99%

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Neutron imaging with bent perfect crystals. I. Imaging conditions

2001

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Neutron imaging with bent crystals is considered in the linear approximation of neutron optics. A matrix formalism analogous to that of conventional lens optics is developed. Various imaging conditions are discussed in relation to the crystal deformation type and to possible applications in neutron scattering. All focusing conditions known previously are included as particular cases. Arrangements combining high resolution in imaging with high resolution in scattering are examined. The concept of Bragg mirrors as devices for non-dispersive imaging is introduced. The most powerful application appears to be that of Bragg mirrors combined with the time-of-¯ight method. Imaging with a thick packet of silicon wafers at the spatial resolution of a single thin wafer is demonstrated.

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Section: Matrix Description Of Diffraction By Deformed Perfect Crystalsmentioning

confidence: 99%

“…A simple lens description of neutron diffraction from a thin curved crystal can be used (Popovici & Stoica, 1983):…”

Section: Matrix Description Of Diffraction By Deformed Perfect Crystalsmentioning

confidence: 99%

Section: Dispersive Two-crystal Arrangementsmentioning

confidence: 99%

Section: Dispersive Two-crystal Arrangementsmentioning

confidence: 99%

Section: Dispersive Two-crystal Arrangementsmentioning

confidence: 99%