Abstract: The invention relates to a multistage low-temperature refrigeration machine with a first stage in the form of a displacer refrigerator (1) as well as at least one further stage in the form of a pulse tube refrigerator (25); in order to suppress vibrations it is proposed that a flexible component (45) designed to prevent the spread of vibrations be placed between the displacer refrigerator (1) and the pulse tube refrigerator (25).

Abstract: A sensor for measuring magnetic flux has at least one hole or opening in a strip resonator of superconductive material defining a ring in which a Josephson element is integrated into the strip resonator and coupled thereto so that attenuation in the tank circuit formed by the ring when a standing wave is established in the strip resonator can be picked up capacitively by a further strip conductor.

Abstract: A piezoelectric precision positioning device for moving an object in three coordinate directions is described, comprising(a) an at least approximately plane-parallel cut piezoelectric disk (5),(b) an electrode arrangement (6, 7, 8, 17), provided with electrical connections (9, 10, 11, 18), on the surfaces parallel to each other, with which three independently controllable electrical fields in the piezoelectric disk (5) can be adjusted,(c) a fork-shaped clamping device (1, 2) which embraces the piezoelectric disk (5), in an electrically insulated manner with respect to the electrode arrangement (6, 7, 8, 17), at at least three pressure points (13, 14, 15, 16), which are situated symmetrically with respect to each other, on the circumferential surface such that(d) one of the electrodes (8) is situated in the open part of the fork-shaped clamping device (1, 2), in which case(e) the object (19) to be positioned is arranged in an electrically insulated manner on an electrode surface (17) in the field region of thi