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An apparatus for production of various atomic and molecular ions inside alinear Paul trap has been set up. The system applies a custom-made, low energy,pulsed electron gun to produce ions in electron impact process. Such ionizationmethod can find some interesting possible applications such as derivation ofions inaccessible other-ways, which can be used in molecular ion experiments.The technique allows also for determination of cross sections for variouscollisional processes.  As a feasibility study, the apparatus was used for determination ofionization integral cross section of calcium in the 16--160 eV range ofelectron impact energy. The obtained cross section values are discussed andcompared with existing data sets.

Measurement of electron-calcium ionization integral cross section using an ion trap with a low-energy, pulsed electron gun