Industry-university Cooperation Foundation Sogang University

Wha-Keun Ahn

Seung Hyun Yoon

Kyu Man Cho

June Gyu Park

Jun Gyu Park

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.

Plasma diagnosis system using multiple-path Thomson scattering

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, 'first collected scattering' by the vertical polarization of the laser pulse and 'second collected scattering' by the horizontal polarization of the laser pulse; a polychromator which filters the collected lights provided from the collection optics according to spectral characteristics and output the filtered lights; and a computer which measures spectral characteristics of the first and second collected scatterings by using the filtered lights and outputs Thomson scattering signal with the background noise and the background noise without Thomson scattering signal.

Growing community of inventors

Andong-si, South Korea

Wha-Keun Ahn