Abstract
The transport of a mixed beam containing N + and N 2 + ions through a periodic focusing electrostatic quadrupole structure is investigated for 20 and 40 keV beam energy and for a wide range of the zero-current phase advance per cell. The current limit for a mixed beam has been derived by means of the Kapchinski-Vladimirski equations and the matrix formalism. Both the theory and experimental results show that ion beams which contain various ion species are transported in essentially the same way as ion beams which contain only one ion species. The dependence of the current limit on the ion mass and energy, as predicted by the theory, is encountered experimentally. For high injected currents the maximum transmission, which is 85%, is reached for a phase advance per cell of 60°–84°, independent of the particle mass and energy.
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