An elastic fastener for fixing a heat sink on a circuit board includes a fixing element, a cylinder and an elastic element. In some embodiments, alloys are incorporated into one or more components of an electrochemical cell, which may enhance the performance of the cell. The Wien filter element and said quadrupole element are adapted to generate, in combination, an astigmatic image. Sourcedrain regions are formed to be separated from each other in a surface region of the semiconductor substrate.