Two-Beam Instability in Electron Cooling
The drift motion of cooling electrons makes them able to respond to transverse perturbations of a cooled ion beam. This response may lead to dipole or quadrupole transverse instabilities at specific longitudinal wave numbers. While the dipole instabilities can be suppressed by a combination of the Landau damping, machine impedance, and the active damper, the quadrupole and higher order modes can lead to either emittance growth, or a lifetime degradation, or both. The growth rates of these instabilities are strongly determined by the machine x-y coupling. Thus, tuning out of the coupling resonance and/or reduction of the machine coupling can be an efficient remedy for these instabilities.
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- Journal Article
- Research Org:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL
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- United States
- 43 PARTICLE ACCELERATORS; DIPOLES; ELECTRON COOLING; ELECTRONS; IMPEDANCE; INSTABILITY; ION BEAMS; LANDAU DAMPING; LIFETIME; QUADRUPOLES; RESONANCE; TUNING Accelerators
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