Abstract: A liquid metal jet X-ray source including an electromagnetic pump for pumping the liquid metal. The electromagnetic pump includes a core having a core diameter and an outer yoke with a thickness of at least 20% of the core diameter. Preferably, the thickness of the outer yoke is at least 20% of the core diameter plus 6% of a radial distance between an outside of the core and an inside of the yoke.

Abstract: A high-rise building comprising a plurality of storeys (5) is characterized in that two or more units (1-1c) of mutually superimposed storeys (5, 6) of the plurality of storeys are arranged one on the other. Each storey unit (1-1c) has a common, garden area (7) located within the confines of the building and has a ground floor on the same level as the lowermost storey of the unit. Each storey unit is served by an elevator and staircase arrangement which is restricted to the unit in question and which is accessible from the ground floor of the garden area (7). Finally, the garden areas (7) are mutually connected by means of separate elevators and staircases from the lowermost storeys of respective units of the high-rise building.