A space-resolved extreme ultraviolet (EUV) spectrometer working in 60–400 Å range has
been developed to observe impurity emission profiles in core and edge plasmas of Large …

The effective charge Z eff indicates the overall impurity contamination of a plasma. Z eff can
be derived experimentally from the intensity of the plasma bremsstrahlung emission. We …

A precise absolute intensity calibration of a flat-field space-resolved extreme ultraviolet
(EUV) spectrometer working in wavelength range of 60–400 Å is carried out using a new …

Four resonance transitions of CIII (977.03 Å: 2 s 2 S 1 0-2 s 2 p P 1 1)⁠, CIV (1550 Å: 2 s S 2-
2 p P 2)⁠, CV (40.27 Å: 1 s 2 S 1 0-1 s 2 p P 1 1)⁠, and CVI (33.73 Å: 1 s S 2-2 p P 2) have …

A flat-field space-resolved extreme ultraviolet (EUV) spectrometer system working in
wavelength range of 10–130 Å has been constructed in the Large Helical Device (LHD) for …

Abstract In the Large Helical Device (LHD), two-dimensional (2D) distribution of edge
impurity line emissions from the ergodic layer with a three-dimensional (3D) magnetic field …

A visible bremsstrahlung detector array diagnostic system has been developed on the Korea
Superconducting Tokamak Advanced Research (KSTAR) to view the whole minor radius in …

An astigmatism-corrected Czerny–Turner-type visible spectrometer coupled with a charge-
coupled device has been installed in large helical device (LHD) to measure visible …

Various types of spectrometers corresponding to different wavelength ranges from X-ray to
visible have been developed for the Large Helical Device (LHD). The charge-coupled …

Miniaturized optical instruments have become very important in industry as smart phones
and tablet PCs increase in popularity. A chronology of spectrometer development shows that …