High-sensitivity reactive desorption measurement by means of metastable atom beams

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Through the technological development of fusion reactors as the future energy resources, it is quite important to elucidate the reactions taking place on the reactor wall surfaces which lead to the inventory of hydrogen fuel in reactors or ensure the corrosion resistant characteristics of reactors. Since the high-sensitivity identification of the reaction products or the adsorbed species is indispensable for the research, we developed technologies for pulsing the metastable atom beams which enabled the high-sensitivity desorption measurement of adsorbates. Firstly, the technology to generate a beam of metastable atoms in their long-lived excited states was developed and then a hexapole magnet consisting of three pairs of N/S magnets cylindrically around an open bore was introduced to deliver the beam keeping at its high intensity. Lastly, a mechanical chopping system using tuning fork choppers was established for forming a pulsed beam of metastable atoms.