VUV Spectrometer for Main Plasma

-Impurity species monitoring for plasma operation.
-Density measurement of light impurities such as carbon, oxygen and boron.
-Study of impurity behavior.

[Detectors, Diagnostic Method]
-Flat-field grazing incidence spectrometer with a holographic grating.
-Spectral lines are detected by a multi-channel detector composed of a micro channel plate (MCP), a fiber plate and a 1024 ch array sensor.
-The sensitivity of this spectrometer is calibrated by the branching ratio method relatively.

-Wavelength range : 0.5 nm - 40 nm
-Wavelength resolution : / > 50 (at 5nm)
-Time resolution : 20 ms

[1] T. Sugie et al., Kakuyugo Kenkyu 59, supplement (1988) 157.
[2] H. Kubo et al., Rev. Sci. Instr. 59 (1988) 1515.
[3] H. Nagata et al., Nucl. Instrum & Methods A294 (1990) 292.