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Updated: Dec 13, 2025

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A neutron recoil-spectrometer for measuring yield and determining liner areal densities at the Z facility
B Lahmann1, M Gatu Johnson1, K D Hahn2
1Plasma Science and Fusion Center at Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Abstract:
A proof-of-principle CR-39 based neutron-recoil-spectrometer was built and fielded on the Z facility. Data from this experiment match indium activation yields within a factor of 2 using simplified instrument response function models. The data also demonstrate the need for neutron shielding in order to infer liner areal densities. A new shielded design has been developed. The spectrometer is expected to achieve signal-to-background greater than 2 for the down-scattered neutron signal and greater than 30 for the primary signal.
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