The invention relates to an ion accelerator arrangement which uses a combination of a magnetic field having a cusp structure and a cross-section of an ionisation chamber that is extended in one direction transversally in relation to the longitudinal axis. The data movers are modular software entities which compartmentalize the differences between operating systems and media types. A guide member is operatively coupled to the first and second waveguide holding members and guides the first waveguide holding member in a transverse direction relative to the second waveguide holding member so as to selectively optically couple and decouple the ends of the first and second optical waveguides. However, when a condition needs urgent action, a direct connection is used for communication such as communication via a telephone or ISDN line. With great advantage, sorting machines of fruit or eggs can be equipped with such devices to determine firmness, or fracture, respectively, and to sort them accordingly.