Neutron energy spectrum measurement using CLYC7-based compact neutron emission spectrometer in the Large Helical Device

2021 ◽  
Vol 16 (12) ◽  
pp. C12025
Author(s):  
S. Sangaroon ◽  
K. Ogawa ◽  
M. Isobe ◽  
M.I. Kobayashi ◽  
Y. Fujiwara ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Neutron Energy ◽  
Doppler Shift ◽  
Neutron Emission ◽  
Neutron Energy Spectrum ◽  
Deuterium Plasma ◽  
Plasma Discharges ◽  
Spectrum Measurement ◽  
Fast Ions ◽  
Body Kinematic

Abstract Tangential compact neutron emission spectrometer (CNES) based on the Cs2LiYCl6:Ce with 7Li-enrichment (CLYC7) scintillator is newly installed in the Large Helical Device (LHD). Measurement of neutron energy spectrum was performed using CNES in tangential neutral beam (NB) heated deuterium plasma discharges. The Doppler shift of neutron energy according to the direction of tangential NB injection has been obtained. When the fast ions moving away from the CNES, lower shifted neutron energy is obtained, whereas the upper shifted neutron energy is obtained when the fast ions moving toward the CNES. The obtained neutron energy is almost consistent with the virgin deuterium-deuterium neutron energy evaluated by the simple two-body kinematic calculation.

Erratum to: Neutron energy spectrum measurement of the Back-n white neutron source at CSNS

2019 ◽  
Vol 55 (8) ◽  
Author(s):  
Yonghao Chen ◽  
Guangyuan Luan ◽  
Jie Bao ◽  
Hantao Jing ◽  
Liying Zhang ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Neutron Source ◽  
Neutron Energy ◽  
Neutron Energy Spectrum ◽  
Spectrum Measurement

Neutron energy spectrum measurement of the Back-n white neutron source at CSNS

2019 ◽  
Vol 55 (7) ◽  
Author(s):  
Yonghao Chen ◽  
Guangyuan Luan ◽  
Jie Bao ◽  
Hantao Jing ◽  
Liying Zhang ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Neutron Source ◽  
Neutron Energy ◽  
Neutron Energy Spectrum ◽  
Spectrum Measurement

scholarly journals Neutron energy spectrum measurement using an NE213 scintillator at CHARM

2018 ◽  
Vol 429 ◽  
pp. 27-33 ◽  
Author(s):  
Tsuyoshi Kajimoto ◽  
Toshiya Sanami ◽  
Noriaki Nakao ◽  
Robert Froeschl ◽  
Stefan Roesler ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Neutron Energy ◽  
Neutron Energy Spectrum ◽  
Spectrum Measurement

Space to Air High-Altitude Region Adjoint Neutron Transport

2021 ◽  
pp. 154851292110316
Author(s):  
Zachary W LaMere ◽  
Darren E Holland ◽  
Whitman T Dailey ◽  
John W McClory
Keyword(s):  
Energy Spectrum ◽  
High Altitude ◽  
Neutron Energy ◽  
Neutron Transport ◽  
Energy Sources ◽  
Source Spectrum ◽  
Detector Response ◽  
Neutron Energy Spectrum ◽  
True Source ◽  
Adjoint Transport

Neutrons from an atmospheric nuclear explosion can be detected by sensors in orbit. Current tools for characterizing the neutron energy spectrum assume a known source and use forward transport to recreate the detector response. In realistic scenarios the true source is unknown, making this an inefficient, iterative approach. In contrast, the adjoint approach directly solves for the source spectrum, enabling source reconstruction. The time–energy fluence at the satellite and adjoint transport equation allow a Monte Carlo method to characterize the neutron source’s energy spectrum directly in a new model: the Space to High-Altitude Region Adjoint (SAHARA) model. A new adjoint source event estimator was developed in SAHARA to find feasible solutions to the neutron transport problem given the constraints of the adjoint environment. This work explores SAHARA’s development and performance for mono-energetic and continuous neutron energy sources. In general, the identified spectra were shifted towards energies approximately 5% lower than the true source spectra, but SAHARA was able to capture the correct spectral shapes. Continuous energy sources, including real-world sources Fat Man and Little Boy, resulted in identifiable spectra that could have been produced by the same distribution as the true sources as demonstrated by two-dimensional (2D) Kolmogorov–Smirnov tests.

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