The multi-reflection time-of-flight mass separator/spectrometer (MR-ToF MS) [1, 2] installed at the ISOLTRAP setup  at ISOLDE at CERN has proven to be a valuable asset to the setup, allowing fast identification of the incoming ion beams  and selection and transfer of only a certain species to either the Penning-trap section , or to other experimental components . The time-of-flight information that is recorded for every species can also be used to determine the masses of the beam constituents with sufficient precision for many physics topics. The use of the MR-ToF MS goes, however, beyond purification for mass-spectrometry [5,7,8] or actual mass measurements by itself [8-10]. It can also be used for decay spectroscopy on clean samples  or, in combination with the Resonant Ionization Laser Ion Source (RILIS) of ISOLDE, for in-source laser-spectroscopy measurements with background suppression . Its capabilities also make it a very attractive tool for target and ion source optimization and ion yield determination .
The ISOLTRAP MR-ToF MS will be discussed in detail and the idea of a future 30kV MR-ToF MS will be presented.
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