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Photon Factory Advanced Ring (PF-AR) at KEK (left)
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The October 26 issue of Physical Review Focus, a free online service that provides brief explanations of selected research papers for students and general public, featured the recent work conducted at the Photon Factory Advanced Ring (PF-AR) by three KEK researchers: Associate Professor Yasunori Tanimoto, Associate Professor Tohru Honda, and Associate Professor Shogo Sakanaka.
For physicists who have worked at any storage rings that contain electron beams, it is a well-known phenomenon that electron beam's lifetime suffers an abrupt, unpredictable decrease, diminishing the electron beam current in a short period of time. At PF-AR as well, this problem had been the biggest factor in distracting the stable beam environment necessary for a successful radiation experiment. Researchers have long speculated that the main culprit would be what is called 'dust trapping', in which positively charged dust particles get trapped by electron beam. The details of this picture, however, have not been well understood. The team led by Tanimoto worked to shed light on how these particles behave and succeeded in catching the trapped dusts on video. This provided the first direct evidence for the dust trapping.
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