Development of curved solenoid for intense pulsed muon generation

我们开发了Super Omega用于在J-PARC MUSE上产生强脉冲μ子。Super Omega由三部分组成，普通导电捕获螺线管、超导弯曲输送螺线管和超导轴向聚焦螺线管。u线上的μ子束以相对于产生μ子目标的反向质子束线的45度角提取。捕获螺线管具有400 msr的大立体角接受度，因此可以在弯曲螺线管的入口捕获并聚焦大量μ子。弯曲螺线管有两个方向相反的45度弯曲段和一个长6m的直段。轴向聚焦螺线管进一步将μ子在实验大厅内线性输送8 m。超级欧米茄于2012年夏天安装。所获得的介子率是目前世界上强度最高的表面介子源。

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.