Abstract
Novel beryllium-scintillator, neutron-fluence detector for magnetized liner inertial fusion experiments
Highlights
Ongoing physics experiments at the Z facility (Sandia National Laboratory, New Mexico) are presently evaluating the magnetized liner inertial fusion (MagLIF) concept for inertial confinement-fusion studies with D2-filled targets [1]
At Z, the adopted, standard diagnostic for measuring DD neutron yields is the activation of indium (115In): the 115Inðn; n0Þ115mIn reaction with a 0.38 MeV threshold and an isomeric daughter nucleus (115mIn) that emits a 336.23 keV gamma ray with a 4.49 hr half-life
Multichannel scaling measurements (MCS) of the 6He decay data were obtained for each detector as a function of photomultiplier tube (PMT) bias (−1800 to −2400 V) and 584 constant-fraction discriminators (CFDs) discriminator settings (25 to 200 mV)
Summary
Ongoing physics experiments at the Z facility (Sandia National Laboratory, New Mexico) are presently evaluating the magnetized liner inertial fusion (MagLIF) concept for inertial confinement-fusion studies with D2-filled targets [1]. The FM4 tally, which is a measure of the 6He nuclei produced in each Be layer, incorporates the energy dependent neutron flux, the energy dependent 9Beðn; αÞ6He cross section, the Be atom density, and the volume of each layer This was calculated by propagating neutrons through the detector geometry using an isotropic, point source of 2.45 MeV DD neutrons located 50 cm directly above the detector stack. A 1-mm thick scintillator was deemed the most feasible choice for a Be detector design for use at the Z facility
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