Ground Zero: A circular access port affords a glimpse into a 10-meter-diameter target chamber where, in the coming months, powerful lasers will be fired with the goal of setting off small thermonuclear explosions. The laser beams will enter through square ports at the bottom (and through more ports, not pictured, at the top). The circular openings allow access for instruments that will monitor the explosions. Extending into the center of the chamber is a camera used to peer back along the paths taken by the beams, examining mirrors and lenses for damage.
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