A Compact Ion-Electron Plasma Camera Spectrometer With an Instantaneous Hemispheric Field of View

Using additive manufacturing and a selective metalization technique, we have developed a compact ion/electron plasma camera based on the donut topology. With its instantaneous field of view of (Formula presented.), it eliminates the need for electrostatic deflectors. This 17 cm diameter plasma camera has an energy range from a few eV to 22 keV, an energy resolution of (Formula presented.) and a geometric factor of (Formula presented.) per pixel, with 64 pixels corresponding to as many individual directions of observation. We have characterized its experimental response under an electron beam and compared it with numerical simulations. We have shown how carbon foils can be used as conversion layers to sequentially measure ions and electrons with a set of micro-channel plates biased at a fixed voltage. This principle was tested under electron and ion beams.