CAJ | 학술논문

高通量μ子源是国际上μ子科学研究的重要条件。在中国散裂中子源的高能质子应用区中，运用蒙特卡罗工具Geant4和G4beamline软件设计了使用内靶超导螺线管俘获高通量表面μ子的束线。与传统的分离靶和基于四极磁铁的收集系统相比，大孔径超导螺线管可以将收集效率提高两个量级。通过对不同靶材的粒子产率进行分析得出石墨是最佳靶材，然后比较俘获螺线管与束流的不同偏转角度下收集的表面μ的产率，提出了合理的较高产率的俘获和输运螺线管的设计方案，并与常规磁铁方案比较，最终在衰变螺线管端口的表面μ通量高达108/s。
고통량μ자원시국제상μ자과학연구적중요조건。재중국산렬중자원적고능질자응용구중，운용몽특잡라공구Geant4화G4beamline연건설계료사용내파초도라선관부획고통량표면μ자적속선。여전통적분리파화기우사겁자철적수집계통상비，대공경초도라선관가이장수집효솔제고량개량급。통과대불동파재적입자산솔진행분석득출석묵시최가파재，연후비교부획라선관여속류적불동편전각도하수집적표면μ적산솔，제출료합리적교고산솔적부획화수운라선관적설계방안，병여상규자철방안비교，최종재쇠변라선관단구적표면μ통량고체108/s。
High intense muons are required by many applications in muon science. A large acceptance channel for surface muons was designed at China Spallation Neutron Source (CSNS) using a superconducting solenoid and an internal target, which can provide a large solid angle to collect intense surface muons. Compared to conventional separate target and collection system based on quadrupole magnets, a superconducting solenoid with large aperture can collect two orders larger of surface muons. This device was simulated by Geant4 and G4beamline. By analyzing the surface muon production ratio produced by the process that protons bombard four different materials, we chose the graphite as the target material. Then comparing the intensity of surface muon by different angles between the axis of the capture solenoids and the proton beam line, we proposed the capture and transport solenoid system with higher muon production ratio. Finally, the yield of surface muon at the exit of decay solenoid can be up to 108/s.