Correlation type time-of-flight spectrometer with magnetically pulsed polarized neutrons

Gordon, J.; Kroó, N.; Orbán, Gergő; Пал, Л.; Pellionisz, P.; Szlavik, F.; Vizi, I.

doi:10.1016/0375-9601(68)90510-0

Cited by 26 publications

(12 citation statements)

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“…It may be the correlation spectroscopy with pseudo-random flux modulation [25][26][27][28][29][30][31][32][33] or Fourier spectroscopy with periodic or quasiperiodic flux modulation [34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Time-of-flight Fourier UCN spectrometer

Kulin

Frank

Goryunov

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We describe a new time-of-flight Fourier spectrometer for investigation of UCN diffraction by a moving grating. The device operates in the regime of a discrete set of modulation frequencies. The results of the first experiments show that the spectrometer may be used for obtaining UCN energy spectra in the energy range of 60÷200 neV with a resolution of about 5 neV. The accuracy of determination of the line position was estimated to be several units of 10 −10 eV

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Section: Introductionmentioning

confidence: 99%

Time-of-flight Fourier UCN spectrometer

Kulin

Frank

Goryunov

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…[25][26][27] Alternatively, such sequences are referred to as pseudo-noise sequences or m-sequences. 25 Particular methods for generation of pseudo-random sequences 28,29 were developed in connection with communication and encryption processes, 30 acoustics 31 , and pseudo-random chopping of a beam in time-of-flight experiments with slow neutrons [32][33][34][35][36][37] and molecular beams. [38][39][40] The maximum duty cycle (relative number of 1's and 0's) of approximately 50%…”

Section: Bpr Sequences and Arraysmentioning

confidence: 99%

“…URAs are widely used as optimal mask patterns for coded aperture imaging techniques. 26 Analogous to the time-of-flight technique based on 1D BPR sequence chopping, [32][33][34][35][36][37][38][39][40] an imaging technique based on the 2D URAs allows one to obtain a better signal-to-noise ratio, keeping the high angular resolution characteristic of a single pinhole aperture. [42][43][44] Similar to the 1D BPR sequences, the URAs possess both high throughput (50%) and a delta-function-like cyclical autocorrelation function that corresponds to a flat 2D PSD spectrum.…”

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confidence: 99%

Calibration of the modulation transfer function of surface profilometers with binary pseudo-random test standards: expanding the application range

et al. 2010

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A modulation transfer function (MTF) calibration method based on binary pseudo-random (BPR) gratings and arrays [Proc. SPIE 7077-7 (2007), Opt. Eng. 47(7), 073602-1-5 (2008)] has been proven to be an effective MTF calibration method for a number of interferometric microscopes and a scatterometer [Nucl. Instr. and Meth. A 616, 172-82 (2010]. Here we report on a significant expansion of the application range of the method. We describe the MTF calibration of a 6 inch phase shifting Fizeau interferometer. Beyond providing a direct measurement of the interferometer's MTF, tests with a BPR array surface have revealed an asymmetry in the instrument's data processing algorithm that fundamentally limits its bandwidth. Moreover, the tests have illustrated the effects of the instrument's detrending and filtering procedures on power spectral density measurements. The details of the development of a BPR test sample suitable for calibration of scanning and transmission electron microscopes are also presented. Such a test sample is realized as a multilayer structure with the layer thicknesses of two materials corresponding to BPR sequence. The investigations confirm the universal character of the method that makes it applicable to a large variety of metrology instrumentation with spatial wavelength bandwidths from a few nanometers to hundreds of millimeters.

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“…The technique was later applied to the new generation of short-pulsed spallation neutron sources and a proof of the principle was carried out at the Intense Pulsed Neutron Source at Argonne National Laboratory (Crawford et al, 1986). The possibilities and benefits of utilizing modulation of the polarization (Gordon et al, 1968;Mezei & Pellionisz, 1972;Cywinski & Williams, 1984) were also discussed. While the correlation technique enables utilization of up to 50% of the incident beam spectrum, the statistical errors of the obtained scattering function are strongly correlated, making it in general inefficient, compared with traditional methods, for measuring weak inelastic signals.…”

Section: Introductionmentioning

confidence: 99%

Implementation of cross correlation for energy discrimination on the time-of-flight spectrometer CORELLI

et al. 2018

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1 This article will form part of a virtual special issue on advanced neutron scattering instrumentation, marking the 50th anniversary of the journal.Keywords: neutron diffraction; energy discrimination; cross-correlation technique; time-of-flight neutron beamlines.Implementation of cross correlation for energy discrimination on the time-of-flight spectrometer CORELLI The CORELLI instrument at Oak Ridge National Laboratory is a statistical chopper spectrometer designed and optimized to probe complex disorder in crystalline materials through diffuse scattering experiments. On CORELLI, the high efficiency of white-beam Laue diffraction combined with elastic discrimination have enabled an unprecedented data collection rate to obtain both the total and the elastic-only scattering over a large volume of reciprocal space from a single measurement. To achieve this, CORELLI is equipped with a statistical chopper to modulate the incoming neutron beam quasi-randomly, and then the cross-correlation method is applied to reconstruct the elastic component from the scattering data. Details of the implementation of the cross-correlation method on CORELLI are given and its performance is discussed.

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Correlation type time-of-flight spectrometer with magnetically pulsed polarized neutrons

Abstract: Correlation type time-of-flight spectrometer has been built for inelastic neutron scattering measurements. The main features of the experimental setup and the first test runs are described.

Cited by 26 publications

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Time-of-flight Fourier UCN spectrometer

Time-of-flight Fourier UCN spectrometer

Calibration of the modulation transfer function of surface profilometers with binary pseudo-random test standards: expanding the application range

Implementation of cross correlation for energy discrimination on the time-of-flight spectrometer CORELLI

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