Development of curved solenoid for intense pulsed muon generation

我们开发了超级欧米茄，用于在J-PARC缪斯产生强脉冲介子。超级欧米茄由三部分组成，即普通导电俘获螺线管、超导弯曲传输螺线管和超导轴向聚焦螺线管。U线中的Muon射束相对于Muon产生目标的反向的质子射束线以45度角被提取。捕获螺线管具有400MSR的大立体角接受度，因此可以在弧形螺线管的入口处捕获和聚焦大量的介子。弧形螺线管有两个方向相反的45度曲线段和一个6米长的直段。在实验大厅内，轴向聚焦螺线管将介子进一步线性传输8m。超级欧米茄于2012年夏天安装。获得的Muon率是目前世界上强度最高的表面Muon源。

We developed Super Omega for intense pulsed muon generation at J-PARC MUSE. The Super Omega is composed of three parts, a normal conducting capture solenoid, a superconducting curved transport solenoid and a superconducting axial focusing solenoid. The muon beam in the U-line is extracted at a 45 degree angle with respect to the proton beamline in the backward direction of the muon production target. The capture solenoid has a large solid angle acceptance of 400 msr, so that a large amount of muons can be captured and focused at the entrance of the curved solenoid. The curved solenoid has two curved sections of 45 degree each of opposite direction, and a 6 m long straight section. The axial focusing solenoid further transports the muons linearly 8 m in the experimental hall. The Super Omega was installed in the summer of 2012. The obtained muon rate is currently the highest intensity surface muon source in the world.