Plateau area characteristics of poly-capillary parallel X-ray lens

Refractive index of glass to X-rays is typically close to 1, so traditional optical lenses cannot be used to converge or control them in parallel．Under the condition of total reflection, direction of X-ray propagation can be guided by changing direction of the center line of capillary tube．A large number of capillaries are arranged and combined in a certain way to control X-rays emitted by point X light source．Here we studied overall poly-capillary parallel X-ray lens, using ray tracing for numerical simulation, designing a simulation program to simulate the propagation path of X-rays in overall poly-capillary parallel X-ray lens．With changing capillary sub-tube parameters and arrangement method, the output beam of capillary X-ray collimated beam lens appeared in the beam plateau, and a poly-capillary parallel X-ray lens with a light uniformity of more than 80% was designed．Equal-diameter and variable-diameter capillary parallel X-ray lenses were used to image point source X-rays, verifying effect of variable-diameter optimization on uniformity of emitted beam．Divergence angle of outgoing beam of variable-diameter X-ray lens was found to be as low as 11.7 mrad．