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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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VUV spectroscopy in impurity injection experiments at KSTAR using prototype ITER VUV spectrometer.

C R Seon1, J H Hong2, I Song2

  • 1National Fusion Research Institute, Gwahangno, 169-148 Yuseong-gu, Daejeon, South Korea.

The Review of Scientific Instruments
|September 3, 2017
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Summary

A prototype spectrometer for ITER successfully measured impurity emission lines at KSTAR, validating its design for fusion plasma analysis. This advancement aids in understanding plasma behavior through VUV spectroscopy.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Fusion Energy Research

Background:

  • The International Thermonuclear Experimental Reactor (ITER) requires advanced diagnostic tools for plasma analysis.
  • Vacuum Ultra-Violet (VUV) spectroscopy is crucial for diagnosing core plasma conditions.

Purpose of the Study:

  • To verify the design of the ITER VUV core survey spectrometer.
  • To assess the performance of a two-channel prototype spectrometer in a real fusion environment.

Main Methods:

  • Development of a two-channel VUV spectrometer prototype.
  • Operation of the prototype spectrometer at the Korea Superconducting Tokamak Advanced Research (KSTAR) facility.
  • Impurity injection experiments conducted in 2015 and 2016.

Main Results:

  • Successful measurement of strong emission lines from Krypton (Kr xxv, Kr xxvi) and Neon (Ne vii, Ne vi).
  • Detection of largely unresolved tungsten lines within the 14-32 nm range.
  • Measured photon numbers ranged from 10^13 to 10^15 photons/cm^2 s, demonstrating high sensitivity.

Conclusions:

  • The prototype VUV spectrometer design is validated by successful operation at KSTAR.
  • The instrument is capable of measuring key spectral lines relevant to fusion plasma impurities.
  • This work supports the development of diagnostics for ITER.