Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2603.05718v1</id>\n    <title>Effects of 3D printed capsule material on activation thin foil irradiation and counting for fusion neutron yield measurements</title>\n    <updated>2026-03-05T22:19:53Z</updated>\n    <link href='https://arxiv.org/abs/2603.05718v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2603.05718v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>Activation foils are used to independently measure the time integrated neutron yield and total fusion energy produced in both inertial and magnetic confinement fusion, making them crucial in the neutron diagnostic suite. The activated foils must be remotely transported from the neutron source to the detector inside of a small capsule, which can impact both the foil irradiation and the associated activation measurement. The aim of this paper is to evaluate the performance of various activation foils and to characterize the effects of different capsule materials to inform the design choices for future systems, such as the SPARC tokamak. Through a combination of FISPACT simulations and irradiation experiments with a deuterium-tritium neutron generator, we tested several different material choices for foils, capsules, and gamma-ray spectrometers. Aluminum and copper foils are found to be suitable for a multi-foil irradiation configuration. The use of 3D-printed thermoplastic capsules reduces the number of measured decay-photon counts, yet the reduction is smaller than the associated measurement uncertainty. Finally, lanthanum-based detectors are shown to be viable alternatives to the standard high-purity germanium spectrometer, although with poorer energy resolution.</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='physics.ins-det'/>\n    <category scheme='http://arxiv.org/schemas/atom' term='physics.plasm-ph'/>\n    <published>2026-03-05T22:19:53Z</published>\n    <arxiv:comment>Shared first authorship: D. Lobelo and E. Panontin have contributed in equal manner to the work and writing of this manuscript and as such share first co-authorship</arxiv:comment>\n    <arxiv:primary_category term='physics.ins-det'/>\n    <author>\n      <name>D. Lobelo</name>\n    </author>\n    <author>\n      <name>E. Panontin</name>\n    </author>\n    <author>\n      <name>X. Wang</name>\n    </author>\n    <author>\n      <name>P. Raj</name>\n    </author>\n    <author>\n      <name>I. Holmes</name>\n    </author>\n    <author>\n      <name>R. A. Tinguely</name>\n    </author>\n  </entry>"
}