Feasibility of Alpha Particle Measurement in a Magnetically Confined Plasma by CO/sub 2/ Laser Thomson Scattering PDF Download

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Feasibility of Alpha Particle Measurement in a Magnetically Confined Plasma by CO/sub 2/ Laser Thomson Scattering

Feasibility of Alpha Particle Measurement in a Magnetically Confined Plasma by CO/sub 2/ Laser Thomson Scattering PDF Author:
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Fusion-product alpha particles will dominate the behavior of the next generation of ignited D-T fusion reactors. Advanced diagnostics will be required to characterize the energy deposition of these fast alpha particles in the magnetically confined plasma. For small-angle coherent Thomson scattering of a CO/sub 2/ laser beam from such a plasma, a resonance in the scattered power occurs near 90/sup 0/ with respect to the magnetic field direction. This spatial concentration permits a simplified detection of the scattered laser power from the plasma using a heterodyne system. The signal produced by the presence of fusion-product alpha particles in an ignited plasma is calculated to be well above the noise level, which results from statistical variations of the background signal produced by scattering from free electrons. 7 refs.