Fig. 1. The evolution of the entire BGS configuration.

Fig. 2. Simplified scheme of a light path from the spatial filter to the target chamber center.

Fig. 3. The fundamental problem of BGS arrangement.

Fig. 4. The process of a light propagating a certain distance and being reflected by one mirror.

Fig. 5. Model of a single light guided by a BGS.

Fig. 6. Scheme of different lights guided by a BGS. L11 and L12 possess the same incident angle so they are in plane layer 1. Meanwhile, L21 with a different incident angle is in plane layer 2.

Fig. 7. The process of a light propagating a certain distance and being reflected by four mirrors.

Fig. 8. Feasible region of : (a) single light (b) two lights.

Fig. 9. The emergence ports are divided into three groups according to the incident layers.

Fig. 10. The calculation process of the base-line algorithm.

Fig. 11. The calculated arrangement of the BGS in the right and bottom parts of the target area.

Fig. 12. The whole BGS of a 192-beam-line laser driver.

Fig. 13. Comparison of the calculated BGS and the NIF BGS.

Fig. 14. Parameters involved in BGS arrangement.

Fig. 15. Extreme situation: the whole target chamber surface is used for incident light ports.

Fig. 16. Port distribution in the target chamber and the 6LEH spherical hohlraum.

Fig. 17. Scheme of the incident port distribution in the target chamber in the theta/phi plane.

Fig. 18. NIF indirect/direct drive and 6LEH incident ports in the theta/phi plane. AP means all ports, which includes direct and indirect ports. Ports with dots indicate that the FOA needs to move to transform.

Fig. 19. The FOAs are rotated by small angles while maintaining the aim towards the center of the target chamber.