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Title: X-ray And EUV Spectroscopy Of Highly Charged Tungsten Ions

Abstract

The Berlin EBIT has been established by the Max-Planck-Institut fuer Plasmaphysik to generate atomic physics data in support of research in the field of controlled nuclear fusion, by measuring the radiation from highly charged ions in the x-ray, extreme ultraviolet and visible spectral ranges and providing valuable diagnostics for high temperature plasmas. In future fusion devices, for example ITER, currently being constructed at Cadarache, France, the plasma facing components will be armored with high-Z materials, most likely tungsten, due to the favorable properties of this element. At the same time the tremendous radiation cooling of these high-Z materials represents a threat to fusion and obliges one to monitor carefully the radiation. With EBIT a selected ensemble of ions in specific charge states can be produced, stored and excited for spectroscopic investigations. Employing this technique, we have for example resolved the wide structure observed around 5 nm at the ASDEX Upgrade tokamak as originating from E1-transitions into the open 4d shell of tungsten ions in charge states 25+ to 37+ producing a band-like emission pattern. Further, these ions emit well-separated M1 lines in the EUV range around 65 nm suitable for plasma diagnostics. Kr-like to Cr-like tungsten ions (38+ to 50+)more » show strong soft-x-ray lines in the range 0.5 to 2 and 5 to 15 nm. Lines of even higher charged tungsten ions, up to Ne-like W{sup 64+}, abundant in the core plasma of present and future fusion test devices, have been investigated with high resolution Bragg-crystal spectroscopy at 0.13 nm. Recently, x-ray spectroscopic measurements of the dielectronic recombination LMn resonances of W{sup 60+} to W{sup 67+} ions have been preformed and compare well with atomic structure calculations.« less

Authors:
;  [1]
  1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 17491 Greifswald, and Institut fuer Physik der Humboldt-Universitaet zu Berlin, Arbeitsgruppe Plasmaphysik, Newtonstr 15, 12489 Berlin (Germany)
Publication Date:
OSTI Identifier:
21344636
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1161; Journal Issue: 1; Conference: 16. international conference on atomic processes in plasmas, Monterey, CA (United States), 22-26 Mar 2009; Other Information: DOI: 10.1063/1.3241214; (c) 2009 American Institute of Physics; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ASDEX TOKAMAK; CHARGE STATES; COMPARATIVE EVALUATIONS; E1-TRANSITIONS; EXTREME ULTRAVIOLET RADIATION; FIRST WALL; HOT PLASMA; ITER TOKAMAK; MULTICHARGED IONS; PLASMA DIAGNOSTICS; RECOMBINATION; SOFT X RADIATION; TUNGSTEN IONS; X-RAY SPECTROSCOPY; CHARGED PARTICLES; CLOSED PLASMA DEVICES; ELECTROMAGNETIC RADIATION; ENERGY-LEVEL TRANSITIONS; EVALUATION; IONIZING RADIATIONS; IONS; MULTIPOLE TRANSITIONS; PLASMA; RADIATIONS; SPECTROSCOPY; THERMONUCLEAR DEVICES; THERMONUCLEAR REACTOR WALLS; THERMONUCLEAR REACTORS; TOKAMAK DEVICES; TOKAMAK TYPE REACTORS; ULTRAVIOLET RADIATION; X RADIATION

Citation Formats

Biedermann, Christoph, and Radtke, Rainer. X-ray And EUV Spectroscopy Of Highly Charged Tungsten Ions. United States: N. p., 2009. Web. doi:10.1063/1.3241214.
Biedermann, Christoph, & Radtke, Rainer. X-ray And EUV Spectroscopy Of Highly Charged Tungsten Ions. United States. doi:10.1063/1.3241214.
Biedermann, Christoph, and Radtke, Rainer. Thu . "X-ray And EUV Spectroscopy Of Highly Charged Tungsten Ions". United States. doi:10.1063/1.3241214.
@article{osti_21344636,
title = {X-ray And EUV Spectroscopy Of Highly Charged Tungsten Ions},
author = {Biedermann, Christoph and Radtke, Rainer},
abstractNote = {The Berlin EBIT has been established by the Max-Planck-Institut fuer Plasmaphysik to generate atomic physics data in support of research in the field of controlled nuclear fusion, by measuring the radiation from highly charged ions in the x-ray, extreme ultraviolet and visible spectral ranges and providing valuable diagnostics for high temperature plasmas. In future fusion devices, for example ITER, currently being constructed at Cadarache, France, the plasma facing components will be armored with high-Z materials, most likely tungsten, due to the favorable properties of this element. At the same time the tremendous radiation cooling of these high-Z materials represents a threat to fusion and obliges one to monitor carefully the radiation. With EBIT a selected ensemble of ions in specific charge states can be produced, stored and excited for spectroscopic investigations. Employing this technique, we have for example resolved the wide structure observed around 5 nm at the ASDEX Upgrade tokamak as originating from E1-transitions into the open 4d shell of tungsten ions in charge states 25+ to 37+ producing a band-like emission pattern. Further, these ions emit well-separated M1 lines in the EUV range around 65 nm suitable for plasma diagnostics. Kr-like to Cr-like tungsten ions (38+ to 50+) show strong soft-x-ray lines in the range 0.5 to 2 and 5 to 15 nm. Lines of even higher charged tungsten ions, up to Ne-like W{sup 64+}, abundant in the core plasma of present and future fusion test devices, have been investigated with high resolution Bragg-crystal spectroscopy at 0.13 nm. Recently, x-ray spectroscopic measurements of the dielectronic recombination LMn resonances of W{sup 60+} to W{sup 67+} ions have been preformed and compare well with atomic structure calculations.},
doi = {10.1063/1.3241214},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1161,
place = {United States},
year = {2009},
month = {9}
}