Moderator Simulation for the Compact Positron Source at NLCTA
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916911945613312 |
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| author | Goldman, Ryland Crisp, Sophie Gessner, Spencer |
| author_facet | Goldman, Ryland Crisp, Sophie Gessner, Spencer |
| contents | Positron moderation is a key part of the production of slow positrons. This paper examines G4beamline simulations of various moderator designs and the addition of a radiofrequency cavity to increase the efficiency of the moderator. A setup consisting of a 100 MeV electron beam incident on a 7 mm tungsten target, a 5 T adiabatic matching device, a 5-cell L-band RF cavity, and a single-crystal tungsten moderator leads to a 39.3x improvement in the number of positrons moderated over a common thin-foil polycrystalline moderator without the AMD and cavity. We also present a novel calculation method for determining the stopping distribution of low-energy positrons in a thin foil, modifying the Makhovian distribution with an exponential ramp to account for edge effects. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_15975 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Moderator Simulation for the Compact Positron Source at NLCTA Goldman, Ryland Crisp, Sophie Gessner, Spencer Accelerator Physics Positron moderation is a key part of the production of slow positrons. This paper examines G4beamline simulations of various moderator designs and the addition of a radiofrequency cavity to increase the efficiency of the moderator. A setup consisting of a 100 MeV electron beam incident on a 7 mm tungsten target, a 5 T adiabatic matching device, a 5-cell L-band RF cavity, and a single-crystal tungsten moderator leads to a 39.3x improvement in the number of positrons moderated over a common thin-foil polycrystalline moderator without the AMD and cavity. We also present a novel calculation method for determining the stopping distribution of low-energy positrons in a thin foil, modifying the Makhovian distribution with an exponential ramp to account for edge effects. |
| title | Moderator Simulation for the Compact Positron Source at NLCTA |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2508.15975 |