The Electron Beam Ion Trap (EBIT)
The EBIT device uses the combination of electrostatic and magnetic fields to confine particles in 3-D. A magnetic field is applied so as to trap particles in 2-D, by virtue of their cyclotron motion, and then electrostatic electrodes are used in order to trap in the third dimension.
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Once trapped an intense electron beam is fired upon the ions. This beam strips electrons from the ions and hence their charge state rises. A higher charge state is required to reduce statistical uncertainty in the mass measurements taken in the penning trap.
Recommended Further Reading:
Master's Thesis of Mike Froese:
The TITAN Electron Beam Ion Trap:
Assembly, Characterization, and First
Tests
Text Books
H.F. Beyer, H.-J. Kluge and V.P. Shevelko X-Ray Radiation of Highly Charged
Ions
Recent Publications
R.E. Marrs et al., PRL 72(1992)4082, Production and Trapping of Hydrogen-like
and bare Uranium Ions in an Electron Beam Ion Trap
R.E. Marrs and D.R. Slaughter, UCRL-JC-131602(1998), A High Intensity Electron
Beam Ion Trap for Charge Boosting of Radioactive Ion Beams
On the web
LLNL