Intertial Confinement Fusion

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Missing Figures

INERTIAL CONFINEMENT FUSION

1. Introduction / Beginnings

In the 1940s during the development of nuclear explosives, the

inertial confinement approach to fusion was born. Weapons

researchers determined that by use of high energy sources, such as the

fission reaction, light nuclei could be fused, thus creating intense fusion

energy. Scientists in the controlled fusion camp also realized that tight

compression of fuel pellets could increase the fusion reaction rate

which is proportional to fuel density. (Robert A. Gross, Fusion

Energy, New York: John Wiley and Sons, 295)

Scientists were, at this stage, trying to discover a mechanism which

could compress a light-nucleus fuel. The invention of high power lasers

encouraged the inertial-confinement camp. The radiation from the

laser heats a fuel pellet, and as the plasma from the pellet rapidly expands,

a momentum reaction sends compressive waves inward,

converging on the pellet's core. The energy in the core causes the ignition

of the pellet. The common desire is to obtain a thermonuclear

energy yield that exceeds the energy which is required

to heat and compress the solid before the pellet explodes;

hence the name inertial confinement. Some of the early research in this

subject was done by Nuckolls and Kidder of the Livermore Laboratory,

and Bosov and Krokhin of the Kurchatov Institute in the

USSR. (Gross, 295)

Since these great efforts, the scientific community has considered

inertial-confinement fusion to be the top alternate method for controlled

thermonuclear fusion. The most probable containment, of

course, is magnetic confinement fusion. Tokamak Fusion Test

Reactor (TFTR) in Princeton, New Jersey is argueably the premier

ma...

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...died; however, the heavy-ion accelerators show much promise in its

short time of consideration. Laser light coupling and laser efficiencies have

been a problem for laser-driven designs. Ion-driven devices

have problems of their own, particularly in focusing to the required power

density. (Dean, 75) The HYBALL-II project as well as other ICF

projects today have easily surpassed the yields of the early ICF

reactors (SOLASE). In the big picture, however, one should keep in mind

that magnetic-confinement devices show much more promise at

this point.

Works Cited

Dean, Stephen O., (ed.). Prospects for Fusion Power. New York: Pergamon

Press, 1981.

Gross, Robert A. Fusion Energy. New York: John Wiley and Sons,

1984.

Velarde, Guillermo, et. al, (ed.). Nuclear Fusion by Inertial Confinement:

A Comprehensive Treatise. Boca Raton: CRC Press, 1993.

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