Abstract: Provided is a plasma diagnosis system using multiple-path Thomson scattering, including: a laser which supplies laser pulse; an optical system which is configuring to focus alternately a vertical polarization of the laser pulse and a horizontal polarization of the laser pulse on first and second focal points in a plasma; a collection optic which collects lights scattered from the first and second focal points in plasma; a polychromator which filters the lights collected by the collection optics according to spectral characteristics; and a computer which measures spectral characteristics by using the filtered lights. Thomson scattered light which is contaminated with noise due to stray lights is produced in the first collected scattering while the noise due to stray lights is produced in the second collected scattering.

Abstract: Provided is a plasma diagnosis system using multiple-reciprocating-pass Thompson scattering.

Abstract: Provided is a plasma diagnosis system using multiple-reciprocating-pass Thompson scattering. The plasma diagnosis system includes: a laser which supplies laser pulses; an optical system configured to make the laser pulse multiple roundtrips, focus the laser pulse to a predetermined position, rotate the plane of polarization by 90 degrees in every completion of the roundtrip; a collection optics which collects lights scattered from the focused region in plasma, which the collected light by the vertical polarization of the laser pulse is referred to as ‘first collected scattering’ and the collected light by the horizontal polarization of the laser pulse is referred to as ‘second collected scattering’; and a polychromator which measures spectral characteristics of the first and second collected scatterings and outputs Thomson scattering signal with the background noise and the background noise without Thomson scattering signal.

Abstract: Provided is a plasma diagnosis system using multiple-path Thomson scattering, including: a laser which supplies laser pulse; an optical system which is configuring to focus alternately a vertical polarization of the laser pulse and a horizontal polarization of the laser pulse on first and second focal points in a plasma; a collection optic which measures a first collection signal obtained by collecting light scattered from plasma and a second collection signal obtained by collecting light scattered from plasma; a polychromator which measures and outputs spectral characteristics of the first and second collection signals. The first and second collection signals are configured with one of a noise and a mixed signal of a Thomson scattering signal and the noise. The system measures a Thomson scattering signal without the noise by using the first and second collection signals.

Abstract: Provided is a plasma diagnosis system using multiple-path Thomson scattering, including: a light source which supplies pulsed laser beams; an optical system which includes first and second beam focusing units and supplies a pulsed laser beam in a vertical polarization state and a pulsed laser beam in a horizontal polarization state to the first and second beam focusing units; a collection optic system which measures a first collection signal obtained by collecting signals scattered from the plasma and a second collection signal obtained by collecting signals scattered from the plasma and measures the first and second collection signals; and a controller which measures a Thomson scattering signal for the plasma by using the first and second collection signals. The first and second collection signals are configured with one of a background scattering noise signal and a mixed signal of a Thomson scattering signal and the background scattering noise signal.

Abstract: Provided is a plasma diagnosis system using multiple-reciprocating-path Thompson scattering. The plasma diagnosis system includes: alight 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.