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The antiProton Unstable Matter Annihilation experiment (PUMA) at CERN aims atinvestigating the nucleon composition in the matter density tail of radioactiveas well as stable isotopes by use of low-energy antiproton-nucleon annihilationprocesses. For this purpose, antiprotons provided by the Extra Low ENergyAntiproton (ELENA) facility will be trapped together with the ions of interest.While exotic ions will be obtained by the Isotope mass Separator On-Line DEvice(ISOLDE), stable ions will be delivered from an offline ion source setupdesigned for this purpose. This allows the proposed technique to be applied toa variety of stable nuclei and for reference measurements. For beampurification, the ion source setup includes a multi-reflection time-of-flightmass spectrometer (MR-ToF MS). Supported by SIMION simulations, an earlierMR-ToF MS design has been modified to meet the requirements of PUMA. Duringcommissioning of the new MR-ToF device with Ar$^+$ ions, mass resolving powersin excess of 50,000 have been obtained after 150 revolutions, limited by thechopping of the continuous beam from an electron impact ionisation source.

A multi-reflection time-of-flight mass spectrometer for the offline ion source of the PUMA experiment