Trapped macroparticles in electron storage rings

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Sudden drops of the beam lifetime ascribed to the capture of positively charged macroparticles (`dust`) are observed at many high-energy electron storage rings. A trapped macroparticle has a certain thermal lifetime due to energy transfer from the beam; the interplay of different ionizing and discharging processes gives rise to an equilibrium charge. The beam lifetime is reduced by bremsstrahlung both in the field of the atomic nuclei and in the macroscopic field of the highly charged dust particle. Recent observations at some storage rings can be explained by the capture of a single macroparticle of about micron size, possibly made ... continued below

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3 p.

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Zimmermann, F.; Seeman, J.T.; Zolotorev, M. & Stoeffl, W. June 1, 1995.

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Description

Sudden drops of the beam lifetime ascribed to the capture of positively charged macroparticles (`dust`) are observed at many high-energy electron storage rings. A trapped macroparticle has a certain thermal lifetime due to energy transfer from the beam; the interplay of different ionizing and discharging processes gives rise to an equilibrium charge. The beam lifetime is reduced by bremsstrahlung both in the field of the atomic nuclei and in the macroscopic field of the highly charged dust particle. Recent observations at some storage rings can be explained by the capture of a single macroparticle of about micron size, possibly made from silicon dioxide. In the two B factories under construction, PEP-II and TRISTAN-II, trapped macroparticles will be thermally unstable and explode after a few tens of microseconds, thanks to the much higher beam current as compared with other storage rings.

Physical Description

3 p.

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INIS; OSTI as DE95014652

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95014652
  • Report No.: SLAC--95-6788
  • Report No.: CONF-950512--186
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 79129
  • Archival Resource Key: ark:/67531/metadc742497

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  • June 1, 1995

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • Feb. 2, 2016, 6:12 p.m.

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Zimmermann, F.; Seeman, J.T.; Zolotorev, M. & Stoeffl, W. Trapped macroparticles in electron storage rings, article, June 1, 1995; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc742497/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.