<p>Energy-variable gamma-rays are produced in Laser Compton Slant-scattering mode at the Shanghai Laser Electron Gamma Source (SLEGS), a beamline of the Shanghai Synchrotron Radiation Facility (also called Shanghai Light Source). Based on the SLEGS energy-variable gamma-ray beam, a positron generation system composed of a gamma-ray-driven section, positron-generated target, magnet separation section and positron experimental section was designed for SLEGS. Geant4 simulation results show that the energy tunable positron beam in the energy range of 1–12.9 MeV with a flux of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2025_1644_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="TEX">${3.7\times 10^{4}}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>3.7</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>4</mn> </msup> </mrow> </math></EquationSource> </InlineEquation>–<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2025_1644_Article_IEq2.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="100" /> </InlineMediaObject> <EquationSource Format="TEX">${6.9\times 10^{5}}\,{\hbox {e}^+/\hbox {s}}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mrow> <mn>6.9</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>5</mn> </msup> </mrow> <mspace width="0.166667em" /> <mrow> <msup> <mtext>e</mtext> <mo>+</mo> </msup> <mo stretchy="false">/</mo> <mtext>s</mtext> </mrow> </mrow> </math></EquationSource> </InlineEquation> can be produced in this positron generation system. The positron beam generation and separation provide favorable experimental conditions for conducting nondestructive positron testing on SLEGS in the future. The positron generation system is currently under construction and will be completed in 2025.</p>

Gamma-induced positron beam generation at SLEGS

期刊论文
发表日期：

2025年3月20日

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Sheng Jin,
Zi-Rui Hao,
Long-Xiang Liu,
Kai-Jie Chen,
Yu-Xuan Yang,
Hang-Hua Xu,
Yue Zhang,
Qian-Kun Sun,
Zhen-Wei Wang,
Gong-Tao Fan,
Hong-Wei Wang

摘要

Energy-variable gamma-rays are produced in Laser Compton Slant-scattering mode at the Shanghai Laser Electron Gamma Source (SLEGS), a beamline of the Shanghai Synchrotron Radiation Facility (also called Shanghai Light Source). Based on the SLEGS energy-variable gamma-ray beam, a positron generation system composed of a gamma-ray-driven section, positron-generated target, magnet separation section and positron experimental section was designed for SLEGS. Geant4 simulation results show that the energy tunable positron beam in the energy range of 1–12.9 MeV with a flux of ${3.7\times 10^{4}}$ $3.7 \times 10^{4}$ – ${6.9\times 10^{5}}\,{\hbox {e}^+/\hbox {s}}$ $6.9 \times 10^{5} e^{+} / s$ can be produced in this positron generation system. The positron beam generation and separation provide favorable experimental conditions for conducting nondestructive positron testing on SLEGS in the future. The positron generation system is currently under construction and will be completed in 2025.