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We describe an apparatus where many species of ultracold atoms can besimultaneously trapped and overlapped with many species of ions in a Paul trap.Several design innovations are made to increase the versatility of theapparatus while keeping the size and cost reasonable. We demonstrate theoperation of a 3-dimensional (3D) magneto-optical trap (MOT) of $^7$Li using asingle external cavity diode laser. The $^7$Li MOT is loaded from an atomicbeam, with atoms slowed using a Zeeman slower designed to work simultaneouslyfor Li and Sr. The operation of a 3D MOT of $^{133}$Cs, loaded from a 2D MOT,is demonstrated and provisions for MOTs of Rb and K in the same vacuum manifoldexist. We demonstrate the trapping of $^7$Li$^+$ and $^{133}$Cs$^+$ atdifferent settings of the Paul trap and their detection using an integratedtime-of-flight mass spectrometer. We present results on low energyneutral-neutral collisions ($^{133}$Cs-$^{133}$Cs, $^7$Li-$^7$Li and$^{133}$Cs-$^7$Li collisions) and charge-neutral collisions($^{133}$Cs$^+$-$^{133}$Cs and $^7$Li$^+$-$^7$Li collisions). We show evidenceof sympathetic cooling of $^7$Li$^+$ ($^{133}$Cs$^+$) due to collisions withthe ultracold $^7$Li ($^{133}$Cs).

A versatile apparatus for simultaneous trapping of multiple species of  ultracold atoms and ions to enable studies of low energy collisions and cold  chemistry