Ion accelerator arrangement

Ion accelerator arrangement having an ionization chamber, a magnet arrangement, and an electrode arrangement, and having means for introducing a neutral working gas into the ionization chamber, wherein

• the electrode arrangement generates an electrostatic acceleration field in the ionization chamber, for positively charged ions, which points predominantly in the longitudinal direction of the arrangement,
• the magnet arrangement generates a magnetic field in the ionization chamber, which has at least one longitudinal segment of a first type, having a magnetic field that runs predominantly perpendicular to the longitudinal direction, and a longitudinal segment of a second type, having a progression of the magnetic field that runs predominantly parallel to the longitudinal direction, adjacent to the longitudinal segment of the first type on both sides, in each instance,
• the ionization chamber has an ion exit opening in the longitudinal direction, and is delimited laterally by a circumferential chamber wall, and forms a simply cohesive cross-sectional surface perpendicular to the longitudinal direction of the chamber cross-section, which is at least twice as great in a first direction (y) as in a second direction (x) perpendicular thereto.