Ion solid interaction and surface modification at rf breakdown in high-gradient linacs

Zeke Insepov, Jim Norem, Seth Veitzer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Ion solid interactions have been shown to be an important new mechanism of unipolar arc formation in highgradient rf linear accelerators through surface self-sputtering by plasma ions, in addition to an intense surface field evaporation. We believe a non-Debye plasma is formed in close vicinity to the surface and strongly affects surface atomic migration via intense bombardment by ions, strong electric field, and high surface temperature. Scanning electron microscope studies of copper surface of an rf cavity were conducted that show craters, arc pits, and both irregular and regular ripple structures with a characteristic length of 2 microns on the surface. Strong field enhancements are characteristic of the edges, corners, and crack systems at surfaces subjected to rf breakdown.

Original languageEnglish
Title of host publicationApplication of Accelerators in Research and Industry - Twenty-First International Conference, CAARI 2010
Pages345-348
Number of pages4
DOIs
Publication statusPublished - 2011
Event21st International Conference on Application of Accelerators in Research and Industry, CAARI 2010 - Fort Worth, TX, United States
Duration: Aug 8 2010Aug 13 2010

Publication series

NameAIP Conference Proceedings
Volume1336
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other21st International Conference on Application of Accelerators in Research and Industry, CAARI 2010
CountryUnited States
CityFort Worth, TX
Period8/8/108/13/10

Keywords

  • High-gradient rf linear accelerators
  • Ion solid interaction
  • Non-Debye plasma
  • Unipolar arc formation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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