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CM-P00072879.pdf
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🔗 Source: cds.cern.ch
📊 Size: 361 KB
📄 Pages: 6 pages
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Summary

The beam-beam transfer function in the ISR exhibits a periodicity equal to the accelerator superperiod, with a period of 4. The analysis shows that the resonant frequencies of the two-beam system are selected among the single beam frequencies depending on optics symmetry. The first side-bands with the lowest stability margin are (Q-8) at 280 kHz and (12-Q) at 1 MHz. The (12-Q) side-band is the first undamped slow wave, and an instability at this mode could produce low frequencies (0 --> 10 kHz) that have been observed but often disregarded as unphysical. The explanation of beam-beam instabilities by a fortuitous excitation of mode (12-Q) seems consistent with all observations.

Description

The beam-beam transfer function in the ISR exhibits a periodicity equal to the accelerator superperiod, with a period of 4.

Technical Information

  • File Format: PDF
  • File Size: 361 KB
  • Pages: 6
  • Language: EN
  • Total Downloads: 81
  • Last Updated: 11 hours ago

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