the energy and flux determination of BL12SW

The energy of BL12SW was determined by utilizing the elastic scattering peak of air, which was detected by a high purity Ge detector. The HP Ge detector was frist calibrated precisely using the Eu source to ensure accurate positioning of the energy peak. Subsequently, several energy points were achieved through the use of a liquid nitrogen-cooled median bent monochromator. The energy at each point was measured by the HP Ge detector. The flux measurement was conducted using a 500mm ion chamber filled with Xe gas. The detailed calculation process is outlined in the paper.

光束线BL12SW的能量通过空气弹性散射峰进行测定，该散射峰由高纯锗探测器（high purity Ge detector, HPGe）探测。随后，使用铕放射源（Eu source）对该高纯锗探测器开展精确校准，以确保能量峰的准确定位。继而，借助液氮冷却的中曲率弯晶单色器（liquid nitrogen-cooled median bent monochromator）获取了多个能量位点，各能量位点的能量均由该高纯锗探测器完成测量。通量测量采用充入氙气的500 mm电离室实施。具体的计算过程已在本论文中详述。