The beam optics was evaluated to determine the specifications for the electromagnets in the proton beamline and the surface muon beamline at the RAON facility. Beam optics was evaluated, up to the fifth order by using GICOSY software; fringe field effects were also investigated. The distributions of the position and the angular divergence of 600-MeV protons were assumed to be Gaussian, and the initial beam emittance was 0.125 π mm mrad. The proton beamline was optimized by adjusting the positions and the magnetic fields of the electromagnetic components. The full width at half maximum (FWHM) proton beam size at the muon production target was 2.75 mm ( x ) × 6.73 mm ( y ), which met the requirement for achieving the maximum surface-muon production at the target. The designed surface-muon beamline is 23-m long and consists of two solenoids, two dipoles with a deflection angle of 70°, six quadrupoles, and a Wien filter. For an initial muon beam size of 6 cm ( x ) × 2 cm( y ), the expected muon intensity at the end of the beamline, where the muon irradiation sample will be located, was estimated to be 7.7 × 10 7 per second.

中文翻译：

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韩国 RAON 设施 μSR 设施的光束光学设计

对光束光学系统进行了评估，以确定 RAON 设施中质子束线和表面 μ 子束线中电磁体的规格。使用 GICOSY 软件对光束光学进行了评估，最高可达 5 阶；还研究了边缘场效应。假设 600-MeV 质子的位置和角发散度分布为高斯分布，初始光束发射率为 0.125 π mm mrad。通过调整电磁元件的位置和磁场来优化质子束线。μ子产生目标处的半高全宽（FWHM）质子束尺寸为2.75 mm（ x ）×6.73 mm（ y ），满足在目标处实现最大表面μ子产生的要求。设计的表面介子光束线长 23 米，由两个螺线管组成，两个偏转角为 70° 的偶极子、六个四极子和一个维恩滤波器。对于 6 cm ( x ) × 2 cm( y ) 的初始 μ 子束大小，在光束线末端（μ子辐射样本所在的位置）的预期 μ 子强度估计为每秒 7.7 × 10 7 。