E.I. Litvinenko

Application of wavelet analysis to data treatment for small-angle neutron scattering

This work presents an improvement in the resulting scattering spectra quality due to the use of spectrometer resolution during both wavelet filtering and traditional smoothing the small-angle neutron scattering (SANS) data. This result leads to a better fitting of the form-factor curve at the next step of data analysis. In addition, the wavelet analysis permits one to extract and analyze a background (noisy) component and what is more to carry out instrumental hardware corrections.

Development of gas-filled position-sensitive detectors of thermal neutrons at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research

The Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research is one of the leading centers of neutron research in Russia. Within the works on the modernization of detector systems, researchers of the laboratory have designed and fabricated linear and area gas-filled position-sensitive detectors of thermal neutrons and the area monitor detector with a low attenuation of the incoming beam. These devices and their main characteristics have been described.

A One-Dimensional Position-Sensitive Detector for Thermal Neutrons

A one-dimensional position-sensitive detector of thermal neutrons has been developed to equip high-efficiency neutron spectrometers at the ИБР-2 research reactor. The detector is based on a multiwire proportional chamber filled with a mixture of 3He + CF4 and has an active area of 200 × 80 mm and a spatial resolution of 2 mm. The detector has been used to good effect in the REFLEX and HRFD spectrometers of the ИБР-2 reactor, as well as in the diffraction facility of the ИВВ-2M research reactor (Zarechnyi, Russia).

Cross‐Fertilization between Spallation Neutron Source and Third Generation Synchrotron Radiation Detectors

Suffering presently from relatively low source strengths compared to synchrotron radiation investigations, neutron scattering methods will greatly benefit from the increase of instantaneous flux attained at the next generation of pulsed spallation neutron sources. In particular at ESS, the strongest projected source, the counting rate load on the detectors will rise by factors of up to 50–150 in comparison with present generic instruments. For these sources the detector requirements overlap partly with those for modern synchrotron radiation detectors as far as counting rate capability and two‐dimensional position resolution are concerned. In this paper, examples of the current and forthcoming detector development, comprising e.g. novel solutions for low‐pressure micro‐strip gas chamber detectors, for silicon micro‐strip detectors and for the related front‐end ASICs and data acquisition (DAQ) systems, are summarized, which will be of interest for detection of synchrotron radiation as well.

Interactive data analysis for neutron spectrometers data based on Visual Numerics' PV-WAVE software package

Abstract The presented work is aimed at the development of tools for data access, visualization, and manipulation of time-of-flight neutron spectrum data acquired from different spectrometers on the IBR-2 fast-pulsed reactor of the Frank Laboratory of Neutron Physics, JINR. Special tools, based on the PV-WAVE software package, for importing neutron data from IBR-2, exporting them in some common format, and data manipulations of such data have been developed by the author. Information about PV-WAVE-based tools for FLNP users is available on the Web.