Electron Beam Ion Traps and Their Use in the Study of Highly Charged Ions

2003 ◽  
pp. 39-75 ◽  
Author(s):  
E. J. Currell
Keyword(s):  
Electron Beam ◽  
Ion Traps ◽  
Highly Charged Ions ◽  
Charged Ions

Visible spectrum of highly charged ions: The forbidden optical lines of Kr, Xe, and Ba ions in the Ar I to Kr I isoelectronic sequence

2002 ◽  
Vol 80 (12) ◽  
pp. 1687-1700 ◽  
Author(s):  
J.R. Crespo López-Urrutia ◽  
P Beiersdorfer ◽  
K Widmann ◽  
V Decaux
Keyword(s):  
Electron Beam ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Visible Spectrum ◽  
Ion Traps ◽  
Highly Charged Ions ◽  
Excited Configuration ◽  
Experimental Conditions ◽  
Ion Cloud ◽  
Charged Ions

We present experimental data on visible transitions in highly charged ions observed in the Lawrence Livermore National Laboratory (LLNL) electron beam ion traps, including results from lines within the ground-state configuration and the first excited configuration. Measurements of lines produced by Kr (q = 11+ to 22+), Xe (q = 18+ to 35+), and Ba (q = 28+ to 36+) ions, corresponding mainly to 3sl 3pm 3dn configurations, were carried out. The ionization stages were determined experimentally by sweeping the electron beam energy over the ionization threshold of each species. We propose possible identifications for the lines with the help of simple atomic structure calculations. However, most observed lines remained unidentified, demonstrating that the understanding of visible spectra from highly charged ions, even if obtained under nearly "ideal" experimental conditions, is still in its infancy. These spectral data may be useful for the diagnostics of magnetically confined plasmas and may set the stage for future measurements of radiative lifetimes. In our experiments, we used the emission from visible lines to image the intersection of the electron beam with a beam of neutral atoms injected into the trap at a right angle as well as the ion cloud in the trap. Under some conditions, the diameter of the ion cloud may be an order of magnitude larger than that of the electron beam. PACS Nos.: 32.30Jc, 39.30+w, 52.59Rz

Applications of EBITs to spectra of multi-electron ions: some solved and some unsolved problems

2008 ◽  
Vol 86 (1) ◽  
pp. 125-129 ◽  
Author(s):  
S Wu ◽  
R Hutton
Keyword(s):  
Electron Beam ◽  
Ion Traps ◽  
Highly Charged Ions ◽  
Spectral Features ◽  
Electron Systems ◽  
Charged Ions

Electron beam ion traps (EBITs) have, and will continue, to play an important role in unraveling spectral features in highly charged ions. In this paper, we will discuss two examples of EBIT-based spectroscopy of multi-electron systems, i.e., spectroscopy of N-, O- and F-like Ba and of Pm-like W. The EBIT work on W will be compared to a spectrum taken at the ASDEX upgrade Tokamak in Garching. PACS Nos.: 32.30.Jc, 32.30.Rj

Extraction of highly charged ions from the Berlin Electron Beam Ion Trap for interactions with a gas target

2006 ◽  
Vol 77 (3) ◽  
pp. 03B903 ◽  
Author(s):  
F. I. Allen ◽  
C. Biedermann ◽  
R. Radtke ◽  
G. Fussmann
Keyword(s):  
Electron Beam ◽  
Ion Trap ◽  
Highly Charged Ions ◽  
Gas Target ◽  
Electron Beam Ion Trap ◽  
Charged Ions

Electron Beam Assisted Extraction of Highly Charged Ions from an ECRIS

1999 ◽  
Vol T80 (B) ◽  
pp. 507
Author(s):  
S. Runkel ◽  
O. Hohn ◽  
L. Schmidt ◽  
K. E. Stiebing ◽  
H. Schmidt-B?cking ◽  
...  
Keyword(s):  
Electron Beam ◽  
Highly Charged Ions ◽  
Assisted Extraction ◽  
Charged Ions

New improvements on the Kansas State University cryogenic electron beam ion source, a user facility for low energy, highly charged ions

2000 ◽  
Vol 71 (2) ◽  
pp. 902-905 ◽  
Author(s):  
M. P. Stockli ◽  
K. Carnes ◽  
C. L. Cocke ◽  
B. D. DePaola ◽  
T. Ehrenreich ◽  
...  
Keyword(s):  
Electron Beam ◽  
Ion Source ◽  
Highly Charged Ions ◽  
Low Energy ◽  
State University ◽  
User Facility ◽  
Kansas State University ◽  
Charged Ions
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