If the maximum magnetic field of lens is 9500Gs and the FWHM width of field is about 11.6cm, the X-ray spot size will finally be 1.03mm approximately.

• 当透镜峰值场强9500Gs；半高宽11.；6cm；束流包络半径3cm；平行入射；X光焦斑直径计算值最终趋于1