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Sawtooth activity of the ion cloud in an electron-beam ion trap

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Radtke,  R.
Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society;

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Biedermann,  C.
Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Radtke, R., & Biedermann, C. (2003). Sawtooth activity of the ion cloud in an electron-beam ion trap. Physical Review. A, 67: 032705. doi:10.1103/PhysRevA.67.032705.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-3F51-0
Abstract
The dynamics of an ensemble of highly charged Ar and Ba ions in an electron-beam ion trap (EBIT) was studied by recording time-resolved x-ray spectra emitted from trapped ions. Sawtoothlike signatures manifest in the spectra for a variety of EBIT operating conditions indicating a sudden collapse of the ion inventory in the trap. The collapse occurs on a time scale of approximately 100 ms and the evolution of the sawteeth is very sensitive to parameters such as electron-beam current and axial trap depth. Analysis of the measurements is based on a time-dependent calculation of the trapping process showing that sawtooth activity is caused by the feedback between the low-Z argon and high-Z barium ions. This unexpected behavior demonstrates the importance of nonlinear effects in electron-beam traps containing more than a single ion species.