Dust trapping experiments at TRISTAN AR

We developed an experimental system investigating trapping of dust particles and installed it to an electron storage ring (TRISTAN AR) where one can reproduce a condition that microparticle trapping artificially occurs. Using this system called micro particle analyzing system (μPAS), trapping of microparticles was systematically observed for the first time in a manner that a well-defined microparticles are dropped into the electron beam. It was found that trapping of metallic microparticles does not occur but trapping of ceramic microparticles and diamond microparticles do for several ten minutes. This would be explainable based on heating and radiation cooling of microparticles which determines a lifetime of trapped microparticles in conjunction with an electron beam current. (author)