The STS-PA20 Plate Accelerator is a type of accelerator used in linear particle accelerators to accelerate charged particles, such as protons or electrons, to high energies. The accelerator consists of a series of thin metal plates, typically made from copper or aluminum, arranged in a vacuum chamber. The plates are powered by an electrical field, which accelerates the particles as they pass through the gaps between the plates. The offered STS-PA20 Plate Accelerator is designed to provide high acceleration gradients and is capable of achieving energies in the range of several GeV.