トロイダルRFイオントラップ中のイオンの閉じ込め時間測定

概要

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We measured ion confinement time τ to characterize our newly developed toroidal FR ion trap. By conjunction of the RF resonance absorption method with sinusoidal- and pulse-modulation methods of electron beam current I_B, we measured τ of non-cooled Arions. In this sinusoidal modulation method, τ is derived from phase delay φ between the oscillation of I_B and the number of confined ions N. The influence of the deformation of confinement potential, which is introduced by applying DC voltage (V_DC) between the diagonal set of trap electrodes, on τ was measured by these two types of modulation methods. The resultant V_DC dependence of τ agreed with each other. The sinusoidal-modulation method is more effective for a noisy signal because of the synchronous detection of φ. We also measured the He buffer gas pressure dependence of τ with buffer-gas-cooled calcium ions by using laser-induced fluorescence detection.
社団法人プラズマ・核融合学会の論文
2001-03-25