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<p>The Southern Advanced Photon Source (SAPS) is a diffraction-limited synchrotron light source under design, which employs longitudinal injection as its primary injection scheme. This kind of injection scheme requires that the injected beam has a short bunch length and low emittance, and the preferred injector should offer high stability and low cost. Therefore, an injector based on a booster synchrotron was developed. The proposed injector includes a 250&#xa0;MeV linac, a booster synchrotron that ramps the beam energy to 3.5&#xa0;GeV, and two beam transport lines to ensure efficient beam delivery and beam quality preservation. The linac utilizes a thermionic high-voltage DC gun for reliable operation and features a bunching system with an advanced focusing system to preserve the emittance. To meet the injection requirements of the SAPS, a comprehensive design for the booster has been conducted. The booster synchrotron employs a threefold lattice structure, incorporating modified theoretical minimum emittance cells with a small momentum compaction factor and a high voltage to achieve an emittance of 3.98&#xa0;nm&#xa0;rad and a bunch length of 4.8&#xa0;mm. The injector has the potential to deliver a high charge, reducing the injection period of the storage ring to less than 1 min. Simulations demonstrated the expected performance, with a transmission efficiency of 90<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\%\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>%</mo> </math></EquationSource> </InlineEquation>, confirming its capability to meet the injection requirement of the SAPS storage ring. This design offers a stable and efficient solution for the SAPS.</p>

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Candidate injector design for the Southern Advanced Photon Source based on linac and booster

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Liang-Sheng Huang,
  • Yan-Liang Han,
  • Wei-Hang Liu,
  • Jian-Liang Chen,
  • Sheng Wang,
  • Yi Jiao,
  • Xiao Li,
  • Jia-Xin Chen

摘要

The Southern Advanced Photon Source (SAPS) is a diffraction-limited synchrotron light source under design, which employs longitudinal injection as its primary injection scheme. This kind of injection scheme requires that the injected beam has a short bunch length and low emittance, and the preferred injector should offer high stability and low cost. Therefore, an injector based on a booster synchrotron was developed. The proposed injector includes a 250 MeV linac, a booster synchrotron that ramps the beam energy to 3.5 GeV, and two beam transport lines to ensure efficient beam delivery and beam quality preservation. The linac utilizes a thermionic high-voltage DC gun for reliable operation and features a bunching system with an advanced focusing system to preserve the emittance. To meet the injection requirements of the SAPS, a comprehensive design for the booster has been conducted. The booster synchrotron employs a threefold lattice structure, incorporating modified theoretical minimum emittance cells with a small momentum compaction factor and a high voltage to achieve an emittance of 3.98 nm rad and a bunch length of 4.8 mm. The injector has the potential to deliver a high charge, reducing the injection period of the storage ring to less than 1 min. Simulations demonstrated the expected performance, with a transmission efficiency of 90 \(\%\) % , confirming its capability to meet the injection requirement of the SAPS storage ring. This design offers a stable and efficient solution for the SAPS.