In this paper, we present two options of the toroid magnetic spectrometer dedicated to measure the energy and the polar and the azimuthal angles of the scattered from the ion’s nuclear electrons in the future electron-ion collider DERICA at JINR. These options differ by the opposite sign of the magnetic field. In one of the options, the toroid magnetic field bends electrons towards the collision line, while in the option with the inverted field a bent is done outwards from the beam axis. We show that the last case provides much larger useful fraction of a solid angle for detection of the scattered electrons. The momentum resolution of such a spectrometer is estimated.

中文翻译：

---

用于电子离子对撞机的环形光谱仪

在本文中，我们提出了两种环形磁谱仪选项，专门用于在 JINR 的未来电子离子对撞机 DERICA 中测量离子核电子散射的能量、极角和方位角。这些选项的不同之处在于磁场的相反符号。在其中一个选项中，环形磁场将电子向碰撞线弯曲，而在具有反向场的选项中，从束轴向外弯曲。我们表明，最后一种情况为检测散射电子提供了更大的立体角有用部分。估计这种光谱仪的动量分辨率。