Recherche

Measuring with polarised neutrons in a high magnetic field configuration The unpolarised neutron beam coming from the hot source enters the monochromator area. Under an applied magnetic field, the polarising ... polarising monochromator diffracts neutrons having a given energy and polarisation sign. Guide-fields are used to maintain the ...

thereby achieving an energy resolution of a few μeV. The energy of the incident neutrons is scanned by variation of the temperature of the monochromator at a fixed Bragg-angle. In an optional mode the ... increases the energy resolution width. A vertically curved Graphite deflector focusses the beam onto the sample. The scattered neutrons are ...

acronym for “CRYOgenic Polarization Analysis Device”. The sample is in its center, in a magnetic field free zone created by a superconducting enclosure. Two sets of fixed and mobile coils make it possible to ... collinear antiferromagnetic samples. Other kinds of magnetic samples modifies the beam polarization in a much complex way and this ...

3 2.1 < Ei/meV < 42 1.0 < ki/Å-1 < 5.0 Measurements with a calibrated monitor at the sample position show for a typical wavevector of ki=2Å-1 a flux of about: double focusing set up: 1.04 x 108 n cm -2 ... wavelengths shorter than 2.5 Å. At longer wavelengths a velocity selector placed far upstream in the guide is used as a filter. The sample is ...

of the Ce 3+ ion. This result is coherent with the observation of a peak at high energy in the inelastic neutron spectra, indicating a very large crystal electric field splitting. Both analyses lead to ... Thermal variation of the magnetization of CeRh3B2The data at T = 150 K were obtained in a different magnetic field, H = 9 T instead of 5 T.Full ...

test of an 3He neutron spin filter The nuclei of a helium-3 gas (3He) can be polarised. Thanks to the strong spin-dependancy of the neutron absorption a bottle filled up with that polarised gas would be ... Roberts, he puts the cell in a special container to transport it to D3 without loss of polarisation. W.Heil and H. Humblot carry the filter to ...

detector block can reach angular positions in the 0° < 2θ A < 90° range in both positive or negative scattering directions. The instrument allows using a wide range of sample environment equipment such as high ... mm (h x v) Multianalyser Flatcone Analysers 31 Si111 bent perfect crystals, fixed curvature for kf=3 A -1 active area 20 mm (W)x ...

D3 Note that help is provided on line for most of the general MAD commands: To get a list in MAD, type: help commands A rather complete description may also be found in the D9 web pages Instrument configuration ... angle theta_in (short name ti) and sets the current in the first precession coil to a value ii (Amps), corresponding to a precession ...

) is selected via Bragg reflection on a monochromator. A Fermi chopper pulses this monochromatic beam, setting the time t 0 of its interaction with the sample. A timer then measures the time t taken by ... to 3.0 (meV) Energy resolution ΔE / Ei 2.5 to 15.0% Max energy transfer in % of Ei 45% Qmin (A-1) 0.4/λ Qmax (A-1) 11.8/λ Monochromator ...

programme, a longer-term project (starting in 2023) would be to merge the SHARP spectrometers and the ILL RAMSES project at the end of a new dedicated guide. A bandwidth chopper positioned upstream of a horizontally ... chamber itself. It will be under vacuum. A removable foil between the sample and the inlet of the chamber will enable to operate ...