Indirect drive: ICF technique whereby the driver energy strikes the fuel capsule indirectly—for example, by the X-rays produced by heating the high-Z enclosure (hohlraum) that surrounds the fuel capsule.

Inertial confinement fusion (ICF): Concept in which a driver delivers energy to the outer surface of a fuel capsule (typically containing a mixture of deuterium and tritium), heating and compressing it. The heating and compression then initiate a fusion chain reaction.

Inertial fusion energy: Concept whereby ICF is used to predictably and continuously initiate fusion chain reactions that yield more energy than that incident on the fuel from the driver for the ultimate purpose of producing electrical power.

KD*P: Potassium dideuterium phosphate, a material widely used in frequency conversion optics.

Krypton fluoride (KrF) laser: Gas laser that operates in the ultraviolet at 248 nm.

Laser–plasma instability: Secondary processes such as symmetry disturbances, fuel preheat, and diversion of laser energy that occur when intense lasers interact with plasmas.

Liquid wall: Fusion reactor chamber’s first wall that features thick jets of liquid coolant. This design may also shield the solid chamber walls from neutron damage.

Magnetized target fusion: ICF technique whereby a magnetic field is created surrounding the target; the field is then imploded around the target, initiating fusion reactions.

Mix (plasma physics): When colder target material is incorporated into the hot reaction region of the target, usually as a result of hydrodynamic instabilities.

Pulse compression: Technique whereby the incident pulse is compressed to deliver the energy in a shorter time.

Pulsed-power fusion: ICF technique that uses a large electrical current to magnetically implode a target.

Reactor chamber: Apparatus in which the fusion reactions would take place in an IFE power plant. It would contain and capture the energy released from repeated ignition.

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