X-ray And EUV Spectroscopy Of Highly Charged Tungsten Ions

Journal Article · Thu Sep 10 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3241214· OSTI ID:21344636

Biedermann, Christoph; Radtke, Rainer ^[1]

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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)

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.

• OSTI ID: 21344636
• Journal Information: AIP Conference Proceedings, Vol. 1161, 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; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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