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X-ray spectroscopy at the Tokyo electron beam ion trap

We have observed x-ray signals from He-like Ba and Ne-like W ions trapped in an Electron Beam Ion Trap (EBIT) at an electron beam energy of 19.9 keV. In the spectra, several transitions in Ne-like Ba and W ions and radiative recombination processes (RR) to n ⩾ 2 levels were observed. These atoms were seeded by the cathode and were ionized in the trap region by electron impact. We have observed dielectronic recombination processes (DR) in Ne-like Xe.