Spectrum of charged particle oscillations in an RF quadrupole field |
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Authors: | M Yu Sudakov |
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Institution: | (1) Ryazan State Pedagogical University, Ryazan, 390000, Russia |
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Abstract: | Variations in the spectral composition of ion oscillations within several stability regions of a quadrupole mass filter were
studied. The frequency spectrum was shown to consist of two line systems. Side lines ωn=nω0±βω0/2 were observed in the oscillation spectrum near harmonics nω0 (n=0, 1, 2,...), where ω0 is the circular frequency of an RF field and β is the stability parameter. Near the boundaries of the stability regions,
the oscillations took the form of beatings. For even values of the stability parameter, β=2k (k=1, 2,...), the beat frequency coincides with the fundamental frequency ω0 and, for β=2k?1, the main beat frequencies are ω0/2 and 3ω0/2. |
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