Abstract:
Provided is an image type electron spin polarimeter. It at least comprises a scattering target, a two-dimensional electron detector and an electron bending unit, wherein the electron bending unit is used for bending the orbit of the incident (scattered) electrons to a first (second) angle to arrive the scattering target (two-dimensional electron detector) with an optimal incident angle, and to transfer the image of the electron intensities from the entrance plane (scattering target) to the scattering target (two-dimensional electron detector) with small aberrations, and to separate the orbits of incident and scattered electrons to increase the degree of freedom of the geometric configuration of each component of the spin polarimeter. At least one of the first and second angles is not 0°, thereby achieving the first transfer of the two-dimensional image of electron intensities on the entrance plane to the scattering target and the second transfer from scattering target to the two-dimensional electron detector respectively with small aberrations, and then achieving multichannel measurements of the electron spin.
Abstract:
Provided is a projection-type charged particle optical system in which a projection magnification can be changed while a decrease in the accuracy in measuring a mass-to-charge ratio is being suppressed. A projection-type charged particle optical system according to the present invention includes a first electrode disposed so as to face a sample and having an opening formed therein for allowing a charged particle to pass, a second electrode disposed on a side of the first electrode opposite to where the sample is disposed and having an opening formed therein for allowing the charged particle to pass, and a flight-tube electrode disposed such that the charged particle that has been emitted from the sample and has passed through the second electrode enters the flight-tube electrode and being configured to form a substantially equipotential space thereinside. A principal plane is formed at at least two positions in a travel path of the charged particle.
Abstract:
The present invention relates to an object information obtaining apparatus that obtains information about a phase image of an object using information about an interference pattern produced by a shearing interferometer, the interference pattern being formed by an electromagnetic wave or electron beam passed through or reflected by the object. The apparatus includes a first obtaining unit configured to obtain information about a differential phase image of the object using the information about the interference pattern, a second obtaining unit configured to obtain information about contrast in each region of the interference pattern, a third obtaining unit configured to weight the information about the differential phase image using the information about the contrast to obtain information about a weighted differential phase image, and a fourth obtaining unit configured to integrate the information about the weighted differential phase image to obtain the information about the phase image of the object.
Abstract:
In order to provide a charged-particle radiation apparatus capable of evaluating and distinguishing the analysis position in a sample subjected to X-ray analysis in the stage before performing X-ray elemental analysis, and also making it possible for an analyst to perform, in a short period of time and without reworking, analysis for which high reliability is ensured, the present invention provides a charged-particle radiation apparatus provided with an X-ray detector, wherein a first back scattered electron detector (15) on the same axis as the X-ray detection surface of the X-ray detector (12 (25-30)) is disposed integrally with or independently from the X-ray detector (12), an X-ray signal being detected by the X-ray detector (12) simultaneously with or separately from detection of a back scattered electron signal by the first back scattered electron detector (15).
Abstract:
A method is proposed herein to detect high atomic number materials, such as Special Nuclear Materials, within a container based on muon tomography. The container is modeled as a plurality of volume elements. Information related to an initial trajectory and a final trajectory of each muon passing through the container is received. Additionally, a set of initial outer prong vectors and a set of final outer prong vectors are created. Then, a plurality of vector combinations are created from a selected initial vector and a selected final vector. A metric is determined and associated with each vector combination. A subset of the plurality of vector combinations is associated with each volume element and an estimated scattering density is determined and assigned to the volume element. Based on the estimated scattering density assigned to the volume elements, a three dimensional image of the container may be generated.
Abstract:
Mineral definitions each include a list of elements, each of the elements having a corresponding standard spectrum. To determine the composition of an unknown mineral sample, the acquired spectrum of the sample is sequentially decomposed into the standard spectra of the elements from the element list of each of the mineral definitions, and a similarity metric computed for each mineral definition. The unknown mineral is identified as the mineral having the best similarity metric.
Abstract:
A silicon drift detector has an X-ray detection device, an electrode terminal subassembly for electrical connection, a Peltier device, and first and second shields formed between the electrode terminal subassembly and the Peltier device. The first shield is made of a material consisting chiefly of an element having an atomic number smaller than the average atomic numbers of the elements included in the material of the Peltier device. The second shield is made of a material consisting chiefly of an element having an atomic number greater than the atomic numbers of the elements included in the material of the Peltier device.