A ray-trace-type counter telescope for neutron spectrometry

2001 ◽  
Vol 48 (3) ◽  
pp. 320-324 ◽  
Author(s):  
G. Wakabayashi ◽  
T. Kitano ◽  
H. Yanagawa ◽  
S. Aoki ◽  
M. Matoba ◽  
...  
Keyword(s):  
Neutron Spectrometry ◽  
Ray Trace ◽  
Counter Telescope

A ray-trace type counter telescope for neutron spectrometry

2002 ◽  
Author(s):  
G. Wakabayashi ◽  
T. Kitano ◽  
H. Yanagawa ◽  
S. Aoki ◽  
M. Matoba ◽  
...  
Keyword(s):  
Neutron Spectrometry ◽  
Ray Trace ◽  
Counter Telescope

Polarization Ray Trace

1989 ◽  
Vol 28 (2) ◽  
Author(s):  
Eugene Waluschka
Keyword(s):  
Ray Trace

Capture-gated neutron spectrometry

2002 ◽  
Vol 476 (1-2) ◽  
pp. 309-312 ◽  
Author(s):  
J.Bart Czirr ◽  
David B Merrill ◽  
David Buehler ◽  
Thomas K McKnight ◽  
James L Carroll ◽  
...  
Keyword(s):  
Neutron Spectrometry

scholarly journals First neutron spectrometry measurement at the HL-2A Tokamak

2013 ◽  
Vol 37 (12) ◽  
pp. 126001 ◽  
Author(s):  
Xi Yuan ◽  
Xing Zhang ◽  
Xu-Fei Xie ◽  
Zhong-Jing Chen ◽  
Xing-Yu Peng ◽  
...  
Keyword(s):  
Neutron Spectrometry ◽  
Spectrometry Measurement

Position-sensitive analysis in curved-crystal three-axis neutron spectrometry (quasielastic scattering case)

2000 ◽  
Vol 33 (1) ◽  
pp. 147-155 ◽  
Author(s):  
A. D. Stoica ◽  
M. Popovici ◽  
W. B. Yelon ◽  
R. Berliner
Keyword(s):  
Silicon Wafers ◽  
Space Theory ◽  
Quasielastic Scattering ◽  
Neutron Spectrometry ◽  
Cold Source ◽  
Demonstration Experiment ◽  
Phase Space Theory ◽  
Position Sensitive ◽  
The Individual ◽  
The Right

The use of bent perfect crystals in focusing three-axis neutron spectrometry with position-sensitive detection (PSD) is analyzed on the basis of a phase-space theory. With PSD, the usual sequential scans are replaced by simultaneous scans. The case of high resolution in energy transfer is considered in detail. With commercial thin silicon wafers, the achievable resolutions are in the 10–150 µeV range, depending on neutron energy. Resolutions around 10 µeV are obtained on the peak of cold-source spectra. To take advantage of the possibilities offered by silicon wafers, PSD with spatial resolution well below 1 mm will be needed. With PSD analysis, a new kind of focusing exists that allows the thickness of bent perfect analyzer crystals to be increased, providing an intensity gain at no resolution loss. With multilamella assemblies a gain in count rate by the number of lamellae in the packet is achievable. Results of a demonstration experiment are presented, confirming that under the right conditions, a multilamella analyzer may resemble a single bent wafer, the individual curves of many wafers having been combined to provide the intensity gain.

Ray trace algorithm description for the study of pump power absorption in double clad fibers

2011 ◽  
Author(s):  
R. Narro ◽  
E. Rodriguez ◽  
L. Ponce ◽  
E. de Posada ◽  
T. Flores ◽  
...  
Keyword(s):  
Pump Power ◽  
Power Absorption ◽  
Ray Trace

Lattice frequency spectra of Pb and Pb40Tl60 by neutron spectrometry

1970 ◽  
Vol 48 (15) ◽  
pp. 1781-1788 ◽  
Author(s):  
A. P. Roy ◽  
B. N. Brockhouse
Keyword(s):  
Force Constant ◽  
Direct Evidence ◽  
Coherent Scattering ◽  
Neutron Spectrometry ◽  
Frequency Spectra ◽  
Polycrystalline Specimen ◽  
Lattice Frequency ◽  
Slow Neutrons

Lattice frequency spectra of Pb and Pb40Tl60 have been measured at 90 °K by inelastic coherent scattering of slow neutrons from a polycrystalline specimen. The results compare favorably with the tunneling measurements of Rowell, McMillan, and Feldman. In Pb40Tl60 we see direct evidence of energy smearing arising from the finite lifetimes of the phonons caused by force-constant disorder in the alloy.

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