HIRFL-CSR实验环电子冷却装置磁场测量

 在HIRFL-CSR实验环电子冷却装置上采用了独立的高精度螺线管串联产生纵向磁场的设计，获得很高的冷却段磁场平行度。使用霍尔片测量磁场的分布，使用磁针测磁方法测量冷却段磁场的磁轴偏角，并根据测量及计算结果对单个线圈磁轴进行微调。测量及调试结果表明，在施加电流为额定电流的一半时，冷却段磁感应强度为0.078 T，剩余磁场小于2×10^-4 T，磁场不平行度小于1×10^-4，达到了预期的设计目标。

Magnetic field measurement of HIRFL-CSR experimental ring electron cooling device

The cooling time and cooling efficiency in electron cooling device strongly depend on the transverse temperature of electron beam. In order to reduce this temperature, a new type of cooling section solenoid composed of 68 coils was used in the HIRFL-CSR electron cooling device to produce a high parallelism magnetic field. With the Hall probe, the components of the magnetic field along the ion beam orbit were measured, and using the compass method the magnetic field parallelism in cooling section was measured. According to the measured results, the magnetic axis angle of each coil with respect to the geometric axis was regulated correspondingly. The magnetic field nonparallelism in the cooling section less than 1×10~(-4) was achieved and a magnetic induction strength of 0.078 T was obtained.