The pTOF fielded with 2 cm W filtering on DIM (90,78), next to a WRF module. (inset) The pTOF detector consists of (1) N-type connector with biased pin, (2) brass housing, (3) ceramic insulator, (4) 200 μm thick, 10 mm diameter CVD-diamond wafer with electrodes, (5) grounding ring aperture (8 mm ID), (6) configurable filtering, and (7) filter cap.
pTOF calibration data recorded at OMEGA: (a) DD-exploding pusher, showing signals from x-rays, DD-neutrons, and secondary D3He-protons. This type of data was used to determine the pTOF sensitivity to fusion products. (b) Ratio of pTOF detector proton sensitivity to neutron sensitivity, as a function of detector thickness. Thinner detectors are observed to have higher relative proton sensitivity. Detectors were filtered with 100 μm Al + 100 μm Ta.
pTOF data recorded at the NIF: (a) Cryogenic DT shot, showing signals from x-rays, DT-neutrons, and (n,γ) reactions in the hohlraum. Detector filtering was 1 mm Ta. The best fit to the DT-neutron peak is overplotted. (b) Nuclear bang-times measured with pTOF agree with measurements from the gamma reaction history diagnostic (GRH) to within experimental uncertainties ( 0.64).
Error budget for pTOF-measured bang times.
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