VUV Doppler broadening measurement
[Objectives]
To measure ion temperature in the divertor region from the Doppler broadening
of carbon and oxygen line emission in the vacuum ultraviolet (VUV) wavelength
range.
[Detectors, Diagnostic Method]
VUV line emission from carbon and oxygen ions in the inner divertor region
is reflected at an angle of 68degree using a tungsten mirror and is led
to a 1.2 m normal incidence VUV spectrometer, which is installed at the
ground floor. The Doppler broadening of line emission is measured with
the higher order (ex. the 4th order for
C IV 155.08 nm at 620.3 nm) to obtain a high wavelength resolution.
[Specification]
| 薺ime resolusion | : | 20 ms/spectrum (1024ch) |
| ・wavelength range | : | 100 - 235 nm |
| ・dispersion | : | 4.54 nm/mm at 610 nm |
| ・Spatial resolution | : | about 10 mm (one chord) |
| ・Position | : | P-5 section, U1-2a port |
| ・Detector | : | Photodiode array (1024ch) + tandem MCP |
[Reference]
(1) A. Sakasai et al., "Spectroscopic System for Measurements of
Ion temperatures from Doppler broadening on JT-60", Kakuyugo Kenkyu
Vol 59 supplement, 169 (1988), in Japanese.