Pressure Dependent Characteristics of an Oak Ridge Type Duoplasmatron Ion Source : II. Composition of Hydrogen Ions.

概要

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A measurement of the abundance ratio of mass species of hydrogen ion beam extracted from an Oak Ridge type duoplasmatron ion source was made with a mass-spectrometer and processes leading to the formation of each ion were discussed. Each ion current of H_1^+, H_2^+, and H_3^+ can reach a value of 70% or more of extracted beam current depending on the operation conditions. The atomic ion current increases as the arc current increases and it becomes dominant when the spacing between intermediate electrode and anode is small. While, the triatomic ion current is dominant at small arc currents and small magnetic field strengths particularly when the gas pressure is high and the spacing between the intermediate electrode and anode is large. The molecular ion current is dominant only at low gas pressures. In contrast with the case of RF ion source the atomic ions are formed by two-stage processes, namely the reactions, H_2+e ⇾ H_2^++2e and subsequent H_2^++e ⇾ H_1^++H_1+e, have an important role. While, the triatomic ions are produced through the ion-molecule reaction, H_2^++H_2 ⇾ H_3^++H_1.
社団法人応用物理学会の論文
1967-09-05