  A cryogenic supersonic gas jet target was developed for the MAGIX experiment
at the high-intensity electron accelerator MESA. It will be operated as an
internal, windowless target in the energy-recovering recirculation arc of the
accelerator with different target gases, e.g., hydrogen, deuterium, helium,
oxygen, argon, or xenon. Detailed studies have been carried out at the existing
A1 multi-spectrometer facility at the electron accelerator MAMI. This paper
focuses on the developed handling procedures and diagnostic tools, and on the
performance of the gas jet target under beam conditions. Considering the
special features of this type of target, it proves to be well suited for a new
generation of high-precision electron scattering experiments at high-intensity
electron accelerators.
