Next Article in Journal
Quantum Entanglement and Shannon Information Entropy for the Doubly Excited Resonance State in Positronium Negative Ion
Next Article in Special Issue
Guest Editor’s Notes on the “Atoms” Special Issue on “Perspectives of Atomic Physics with Trapped Highly Charged Ions”
Previous Article in Journal
Probing and Manipulating Fermionic and Bosonic Quantum Gases with Quantum Light
Previous Article in Special Issue
Experiments with Highly-Ionized Atoms in Unitary Penning Traps
Open AccessArticle

Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics

1
Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
2
Lund Observatory, Lund University, SE-221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Elmar Träbert
Atoms 2015, 3(3), 407-421; https://doi.org/10.3390/atoms3030407
Received: 11 April 2015 / Revised: 1 August 2015 / Accepted: 17 August 2015 / Published: 9 September 2015
(This article belongs to the Special Issue Perspectives of Atomic Physics with Trapped Highly Charged Ions)
The extreme ultraviolet (EUV) emission from few-times ionized tungsten atoms has been experimentally studied at the Livermore electron beam ion trap facility. The ions were produced and confined during low-energy operations of the EBIT-I electron beam ion trap. By varying the electron-beam energy from around 30–300 eV, tungsten ions in charge states expected to be abundant in tokamak divertor plasmas were excited, and the resulting EUV emission was studied using a survey spectrometer covering 120–320 Å. It is found that the emission strongly depends on the excitation energy; below 150 eV, it is relatively simple, consisting of strong isolated lines from a few charge states, whereas at higher energies, it becomes very complex. For divertor plasmas with tungsten impurity ions, this emission should prove useful for diagnostics of tungsten flux rates and charge balance, as well as for radiative cooling of the divertor volume. Several lines in the 194–223 Å interval belonging to the spectra of five- and seven-times ionized tungsten (Tm-like W VI and Ho-like W VIII) were also measured using a high-resolution spectrometer. View Full-Text
Keywords: EBIT; tokamak divertor; plasma diagnostics; tungsten ions; EUV spectroscopy EBIT; tokamak divertor; plasma diagnostics; tungsten ions; EUV spectroscopy
Show Figures

Figure 1

MDPI and ACS Style

Clementson, J.; Lennartsson, T.; Beiersdorfer, P. Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics. Atoms 2015, 3, 407-421.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

1
Only visits after 24 November 2015 are recorded.
Search more from Scilit
 
Search
Back to TopTop