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We are constructing a Ti diagnostic for low neutron yield (5×107 to above 109) d‐d and d‐t targets in the Nova facility at Livermore. The diagnostic measures the neutron energy spread with 960 scintillator‐photomultiplier detectors located 28 m from the target and operates in the single‐hit mode. Each detector can measure a single neutron arrival with time resolution of 1 ns or better. The arrival time distribution is constructed from the results of typically 200–500 detector measurements. The ion temperature is determined from the spread in neutron energy ΔEn∝Ti1/2, which is related to the arrival time spread by Δt/t≂−(1/2)ΔEn/En. Each neutron arrival is detected by using a photomultiplier tube to observe the recoil proton from elastic scattering in a fast plastic scintillator. The timing electronics for each channel consist of a novel constant fraction‐like discriminator and a multiple hit time‐to‐digital converter. The overall system design, together with single‐channel performance data, is presented.

Neutron time-of-flight ion temperature diagnostic for inertial-confinement-fusion experiments