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Updated: Jun 15, 2026

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
Published on: July 12, 2016
The effect of rf pulse pattern on bremsstrahlung and ion current time evolution of an ECRIS
T Ropponen1, O Tarvainen, V Toivanen
1Department of Physics, University of Jyvaskyla, Jyvaskyla FI-40014, Finland. tommi.ropponen@jyu.fi
Abstract:
Time-resolved helium ion production and bremsstrahlung emission from JYFL 14 GHz ECRIS is presented with different radio frequency pulse lengths. rf on times are varied from 5 to 50 ms and rf off times from 10 to 1000 ms between different measurement sets. It is observed that the plasma breakdown occurs a few milliseconds after launching the rf power into the plasma chamber, and in the beginning of the rf pulses a preglow transient is seen. During this transient the ion beam currents are increased by several factors compared to a steady state situation. By adjusting the rf pulse separation the maximum ion beam currents can be maintained during the so-called preglow regime while the amount of bremsstrahlung radiation is significantly decreased.
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