Determination of Iron Density at the Plasma Center Using Radial Profile of FeKα Lines in LHD

• MUTO Sadatsugu

  National Institute for Fusion Science, Toki 509-5292, Japan

• MORITA Shigeru

  National Institute for Fusion Science, Toki 509-5292, Japan

• LHD Experimental Group

  National Institute for Fusion Science, Toki 509-5292, Japan

Abstract

Radial profiles of K_α X-ray spectra of metallic impurities have been measured using an assembly of soft X-ray pulse-height analyzers in Large Helical Device. The assembly is quipped with a radial scanning system, which gives us detailed profile information, especially in long pulse discharges. The local emissivity profiles of the Fe-K_α X-ray spectra have been quantitatively obtained by an Abel inversion technique. The density profile of the iron impurity in each charge state is analyzed using the energy shift profiles of the Fe-K_α spectra with the help of an impurity code analysis. As an example of the present method, the iron density of 1.2× 10⁹ cm^-3 in the plasma center is obtained at the line-averaged electron density of 2.6× 10¹³ cm^-3.

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 3 S1086-S1086, 2008

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• pulse height analyzer
• iron
• chromium
• titanium
• Large Helical Device

Details

• CRID: 1390282680230355712
• NII Article ID: 130000264031
• DOI: 10.1585/pfr.3.s1086
• ISSN: 18806821
• Web Site: http://www.jstage.jst.go.jp/article/pfr/3/0/3_0_S1086/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed