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Description
A duoplasmatron ion source with the carbon plasma electrode has successfully produced poly-atomic carbon ions up to C$_6^+$. The intermediate electrode has six holes to guide cathode plasma to the carbon discharge anode performing as the plasma electrode. A 1 mm diameter extraction hole is opened at the center of the carbon plasma electrode, where is no exposure to the plasma from the cathode region. The ion source maintains a stable discharge with both H$_2$ and Ar as discharge support gas, but works better at lower pressure with Ar. A hydrogen plasma produced molecular ions of hydrocarbons while Ar plasma delivered a beam with the mass peak corresponding to Ar$_2^+$ with the intensity about one-eighth of Ar$^+$ peak. With 150 W discharge power, the source produced about 1 micro-ampere of mass separated C$_6^+$ ion current.
| E-mail for contact person | mwada@mail.doshisha.ac.jp |
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