Patent Number: 
Section: claims

1. An inertial confinement fusion system comprising:a fusion chamber for producing neutrons from a fusion reaction;a laser system including a plurality of lasers arranged about the fusion chamber to provide energy to the fusion chamber to initiate the fusion reaction; anda plurality of beam paths between the lasers and the fusion chamber, each beam path of the plurality of beam paths comprising a first portion which passes through a first neutron pinhole and a second portion which passes through a second neutron pinhole spaced from the first neutron pinhole, the first neutron pinhole and the second neutron pinhole arranged such that neutrons having linear trajectories propagating from the fusion chamber to the laser system do not pass through both the first and second neutron pinholes. 2. An inertial confinement fusion system as in claim 1 wherein the first portion and the second portion are orthogonal to one another. 3. An inertial confinement fusion system as in claim 1 wherein the laser system is divided into a first portion arranged above the fusion chamber and a second portion below the fusion chamber, beams from the first portion entering the fusion chamber through openings in an upper portion of the fusion chamber, and beams from the second portion entering the fusion chamber through openings in a lower portion of the fusion chamber. 4. An inertial confinement fusion system as in claim 3 wherein the fusion chamber comprises a plurality of segments, each segment having at least two openings through which the beam paths pass. 5. An inertial confinement fusion system as in claim 1 further comprising a vacuum chamber surrounding the fusion chamber. 6. An inertial confinement fusion system as in claim 5 wherein the vacuum chamber includes sealed openings configured to have light beams propagating along the beam paths pass through the vacuum chamber and enter the fusion chamber. 7. An inertial confinement fusion system as in claim 5 wherein the vacuum chamber includes a door configured to be opened and closed to allow entry of the fusion chamber into the vacuum chamber. 8. An inertial confinement fusion system as in claim 1 further comprising a coolant blanket through which coolant circulates, the coolant blanket surrounding the fusion chamber to remove heat therefrom. 9. An inertial confinement fusion system as in claim 1 wherein the fusion chamber comprises a plurality of segments, each segment of the plurality of segments including:a first wall including a set of tubes through which coolant flows;a coolant blanket behind the first wall through which coolant also flows;a first connector for connecting a source of the coolant to the segment; anda second connector for providing a flow path out of the segment for coolant which has circulated in the segment. 10. An inertial confinement fusion system as in claim 9 wherein the fusion chamber is spherical in shape and each of the plurality of segments comprises a longitudinal slice through a vertical axis of the spherical shape. 11. An inertial confinement fusion system as in claim 9 wherein each segment further includes:a first part of an opening through which fusion targets are injected into the chamber; anda second part of an opening through which waste from the fusion targets is configured to be collected. 12. An inertial confinement fusion system comprising:a fusion chamber for producing neutrons from a fusion reaction, the fusion chamber including a plurality of modules;a vacuum chamber for containing the fusion chamber and isolating the fusion chamber in an atmosphere of reduced pressure;a plurality of lasers arranged about the fusion chamber to provide energy to the fusion chamber, the plurality of lasers separated from the vacuum chamber by at least a first wall and a second wall; anda plurality of beam paths between the lasers and the fusion chamber, each beam path extending through a corresponding first pinhole of the first wall and a corresponding second pinhole of the second wall, the second pinhole offset from the first pinhole. 13. An inertial confinement fusion system as in claim 12 wherein the modules of the fusion chamber are not physically connected to each other, and each module includes a support member configured to hold the module in a desired position, and wherein individual modules are configured to be individually replaced without replacing all of the modules. 14. An inertial confinement fusion system as in claim 12 wherein individual ones of the plurality of lasers are configured to be individually replaced without replacing all of the lasers. 15. An inertial confinement fusion system as in claim 14 wherein the individual lasers are configured to be replaced while the inertial confinement fusion system is operating. 16. An inertial confinement fusion system as in claim 12 wherein the first wall and the second wall are configured to block neutrons having linear trajectories from propagating from the vacuum chamber to the laser system. 17. An inertial confinement fusion system as in claim 12 further including:a maintenance bay;a spare fusion chamber stored in the maintenance bay;a door in the vacuum chamber; andwherein the fusion chamber situated within the vacuum chamber is configured to be removed from the vacuum chamber through the door and replaced by the spare fusion chamber from the maintenance bay.