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A compact stilbene crystal neutron spectrometer for EAST D-D plasma neutron diagnostics
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View: Figures


Image of FIG. 1.
FIG. 1.

Components of the pulse height spectrum for 2.5 MeV mono-energetic neutrons. The red histogram is the pulse height spectrum generated by recoil protons produced in single-scattering processes. The blue one is the spectrum in which neutrons are scattered two or three times. The green one is the spectrum induced by neutrons scattered by C and H nuclides. The black spectrum is the total spectrum. The inset figure shows the position of the multiple scattering peaks for different angle dependent factors.

Image of FIG. 2.
FIG. 2.

Comparisons of the simulated spectra with different α values to the measured spectra induced by 2.4 MeV neutrons. The colored lines are the simulated spectra with different α values. The black histogram is the measured spectrum for 2.4 MeV neutrons. The inset figure shows the ratios of the centroids in the simulated spectra to the measured.

Image of FIG. 3.
FIG. 3.

Optimal light output function for the recoil protons parallel to c axis. The black cross points are the values from experiment.

Image of FIG. 4.
FIG. 4.

Comparisons of some of the simulated spectra to experimental spectra. The black histograms are the experimental spectra. The red lines are the simulated spectra.

Image of FIG. 5.
FIG. 5.

Fitted pulse height resolution function of the stilbene crystal neutron spectrometer. The black points are the values determined from the fits to experimental spectra. The red solid line is the fitted function of pulse height resolution. The red dashed line is the resolution function of a liquid scintillation neutron spectrometer. 2

Image of FIG. 6.
FIG. 6.

Unfolded neutron spectra (black histogram) and the TARGET calculated spectra (red histogram) of 2.5 MeV neutrons (a) and 14 MeV neutrons (b). (c) and (d) The comparisons of the reconstructed spectra (red line) with measured (black histogram).

Image of FIG. 7.
FIG. 7.

Measured and calculated pulse height spectra determined for the scenarios: (a) LHW and (b) ICRF. (c) and (d) Unfolded fusion neutron spectra determined from the pulse height spectra for the two heating scenarios.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A compact stilbene crystal neutron spectrometer for EAST D-D plasma neutron diagnostics