Cross section of the neutron time-of-flight detector showing the BC-408 scintillator and the H1949-51 photomultiplier tube inside the stainless-steel housing. The inside cover of the scintillator is from black-anodized aluminum. In order to minimize the interface reflection, a silicone grease was applied between the scintillator and the PMT entrance window.
The dependence of the PMT response (FWHM and rise time) on the operating voltage. The error bars indicate uncertainty.
The typical time response to a 3 MeV neutron recorded with a 500 MHz oscilloscope (solid line) and the convolution of the PMT time response with the scintillator decay (dashed line). The measurement was based on the technique which is described in Sec. IV. Since only a single neutron was detected, the uncertainty caused by a neutron transit time through 50-mm-thick scintillators is not included in this time response.
The dependence of the PMT delay on the PMT voltage. The error bars indicate ±2σ uncertainty.
An example of a ToF signal recorded at 83.7 m.
The dependence of peak areas on neutron energies calculated from the neutron ToF. A dashed line represents a relative dependence of the light output for recoil protons according to Ref. 15.
The dependence of the detection efficiency of the neutron energy for 50 mm thick BC-408 scintillator.
The histogram of peak areas for 2.2–2.7 MeV neutrons. In order to include the effect of the discrimination limit, several counts were added into a 0–0.2 pC region.
The waveforms of current derivative, soft x-rays, hard x-rays, and neutron emission recorded in discharge No. 090429-23 with a neutron yield of about ±2σ.
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