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Measurements of Ion velocity distributions are one of basic goals of spaceplasma studies. There is variety of ion and electron spectrometers (e.g. Wuestet al, 2007, Young et al., 2007, Zurbuchen and Gershman, 2016, Vaisberg et al,2016). The most frequently used ion spectrometer is top-hat analyzer (Carlsonet al., 1983) consisting of toroidal electrostatic analyzer, electrostaticscanner and time-of-flight section with thin foil as start element and ionpre-acceleration. We describe new energy-mass analyzer with electrostaticscanner providing hemispheric field-of view with small aberration, toroidalelectrostatic analyzer, time-of-flight synchronizer with simple gate. Itprovides desirable hemisphere scanning, wide energy range and reasonable massresolution. It can provide detailed measurements of the ion velocitydistribution of ion species without significant gaps to obtain reliable momentsof plasma flow. This analyzer without TOF ability can be used for measurementsof electron component. With simple electro-optics elements this analyzer can beeasily modified to many goals of plasma investigations.

New ion energy-mass spectrometer ULTIMAN (UlTImate Mass ANalyzer) for space plasmas