The Development of HTS Solenoid Lens for Electron Microscope

The electron microscope has higher resolving power than a light microscope and can reveal the structure of smaller objects. This paper describes the development of the lens of an electron microscope with high-temperature superconducting (HTS) solenoid. The lens consists of double Bi-2223 HTS pancake coils and a ferromagnetic container. The cryogen-free HTS coils are refrigerated by a cryocooler and operated at the temperature of 43 K. The diameter of the warm bore is 10 mm, and the peak central magnetic field is about 2 T.