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Experimental demonstration and visual observation of dust trapping in an electron storage ring

Yasunori Tanimoto, Tohru Honda, and Shogo Sakanaka
Phys. Rev. ST Accel. Beams 12, 110702 – Published 16 November 2009
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Abstract

Sudden decreases in the beam lifetime, which are attributed to the dust trappings, sometimes occur at the electron storage ring Photon Factory Advanced Ring (PF-AR). Since these dust events cause difficulties in user operations, we have been carefully observing this phenomenon for many years. Our observations indicated that the dust trappings could be caused by electric discharges in vacuum ducts. In order to demonstrate this hypothesis experimentally, we designed a new vacuum device that intentionally generates electric discharges and installed it in PF-AR. Using this device, we could repeatedly induce sudden decreases in the beam lifetime because of the generated electric discharge. We also detected decreases in the beam lifetime caused by mechanical movement of the electrodes in the device. Moreover, we could visually observe the dust trapping phenomenon; the trapped dust particle was observed by two video cameras and appeared as a luminous body that resembled a shooting star. This was the first direct observation of a luminous dust particle trapped by the electron beam.

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  • Received 17 June 2009

DOI:https://doi.org/10.1103/PhysRevSTAB.12.110702

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Authors & Affiliations

Yasunori Tanimoto*, Tohru Honda, and Shogo Sakanaka

  • Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305-0801, Japan

  • *yasunori.tanimoto@kek.jp

See Also

Storage Ring Dust-Up

Michael Schirber
Phys. Rev. Focus 24, 16 (2009)

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Vol. 12, Iss. 11 — November 2009

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