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Light ion heating in electron cyclotron resonance ion sources
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The experiments described here were performed at a 5 GHz electron-cyclotron-resonance ion source with a magnetic hexapole. The discharge was run in argon. By launching a fast magnetoacoustic wave from the high-field side (end on) we heated hydrogen ions—present in traces from the residual gas—at their fundamental ion cyclotron resonance (ICR) frequency of 2.2 MHz with 5 W only. As a consequence the currents of Arq+ ions extracted from the source were significantly increased for q≥5 while the currents of lower charged argon ions were decreased, indicating an enhanced plasma confinement. However, a reduction of the hydrogen content in the residual gas resulted in a reversal of the effect of ICR heating.
Title: Light ion heating in electron cyclotron resonance ion sources
Description:
The experiments described here were performed at a 5 GHz electron-cyclotron-resonance ion source with a magnetic hexapole.
The discharge was run in argon.
By launching a fast magnetoacoustic wave from the high-field side (end on) we heated hydrogen ions—present in traces from the residual gas—at their fundamental ion cyclotron resonance (ICR) frequency of 2.
2 MHz with 5 W only.
As a consequence the currents of Arq+ ions extracted from the source were significantly increased for q≥5 while the currents of lower charged argon ions were decreased, indicating an enhanced plasma confinement.
However, a reduction of the hydrogen content in the residual gas resulted in a reversal of the effect of ICR heating.
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