PLASMA DIAGNOSTIC SYSTEM USING MULTIPLE RECIPROCATING PATH THOMSON SCATTERING

摘要

Provided is a plasma diagnosis system using multiple-reciprocating-path Thompson scattering. The plasma diagnosis system includes : a light source which supplies pulsed laser beams; an optical system which sequentially supplies a pulsed laser beam in a vertical polarization state and a pulsed laser beam in a horizontal polarization state; a collection optic system which measures a first collection signal scattered from the plasma when the pulsed laser beam in the vertical polarization state is focused and measures a second collection signal scattered from the plasma when the pulsed laser beam in the horizontal polarization state is focused; and a controller which measures a Thomson scattering signal for the plasma by using the first and second collection signals measured by the collection optic system, and the second collection signal is a background scattering noise signal. The plasma diagnosis system using multiple-reciprocating-path Thompson scattering sequentially supplies the pulsed laser beam in the vertical polarization state and the pulsed laser beam in the horizontal polarization state into the plasma, so that it is possible to accurately measure a Thomson scattering signal without a background scattering noise signal.