PSI的MUSE实验用液氢靶
A Liquid Hydrogen Target for the MUSE Experiment at PSI
摘要：
一个280毫升的液氢目标已建成和测试的MUSE实验在PSI调查质子电荷半径通过同时测量弹性μ子质子和弹性电子质子散射。为了将系统的不确定性控制在低于百分之一的水平，对目标周围的材料数量及其温度稳定性进行了严格的限制。靶室壁由$120\,μ$ m厚的Kapton制成，而射束入口和出口窗由$125\,μ$ m厚的镀铝Kapton制成。侧出射窗由层压在芳族聚酰胺织物上的Mylar制成，芳族聚酰胺织物的面密度为$368\,$ g/m2 $^2$。目标系统于2018年底在PSI的调试运行期间成功运行。目标温度稳定在0.01K水平。这表明在$0.02\,$ %水平下的密度稳定性，其比所需的高约10倍。
英文摘要：
A 280 ml liquid hydrogen target has been constructed and tested for the MUSE experiment at PSI to investigate the proton charge radius via simultaneous measurement of elastic muon-proton and elastic electron-proton scattering. To control systematic uncertainties at a sub-percent level, strong constraints were put on the amount of material surrounding the target and on its temperature stability. The target cell wall is made of $120\,μ$m-thick Kapton, while the beam entrance and exit windows are made of $125\,μ$m-thick aluminized Kapton. The side exit windows are made of Mylar laminated on aramid fabric with an areal density of $368\,$g/m$^2$. The target system was successfully operated during a commissioning run at PSI at the end of 2018. The target temperature was stable at the 0.01 K level. This suggests a density stability at the $0.02\,$% level, which is about a factor of ten better than required.
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