Fig. 1. Schematic of proton imaging with mesh in FLUKA program

Fig. 2. Determination of relationship between magnetic field intensity and distance d.(a)One-dimensional distribution of deflected proton images^[12];(b)distribution of unperturbed proton images;(c)positons of each beamlet with magnetic field and without magnetic field;(d)ξ versus d²

Fig. 3. Proton images at different moments.(a1)(b1)0.3 ns;(a2)(b2)0.6 ns;(a3)(b3)0.9 ns;(a4)(b4)1.2 ns

Fig. 4. Spatial distributions of magnetic fields at different moments simulated by FLUKA program.(a)0.3 ns;(b)0.6 ns;(c)0.9 ns;(d)1.2 ns

Fig. 5. One-dimensional intensities of proton beams at different moments.(a)0.3 ns;(b)0.6 ns;(c)0.9 ns;(d)1.2 ns

Fig. 6. Time evolutions of R_bandR₀

Fig. 7. Spatial distributions of magnetic fields at 0.6 ns.(a)Result in Ref.[12];(b)result obtained by FLUKA program