The Impact of the Three-Wave Instability on the Spiral Line Induction Accelerator

Abstract

The solenoidal and helical quadrupole magnetic fields that are used to transport the high current beam in the spiral line induction accelerator may admit instabilities such as the electromagnetic three wave instability. Previous studies have shown that stability is easily maintained for energies up to approx. 40 MeV. Three wave growth rates for energies exceeding 40 MeV can be < or = .001/cm. Strategies are outlined for stabilizing or further reducing growth rates. These are (1) cyclotron detuning, where the instability is detuned by varying the axial magnetic field, (2) damping the instability through the use of discrete quadrupole focusing, which allows the instability to be detuned by varying the quadrupole wavenumber. The effectiveness of de-Qing and cyclotron detuning is discussed for the various instability regimes. Keywords: Q Factor, High current, Accelerator, Strong focusing.

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Document Details

Document Type
Technical Report
Publication Date
Nov 23, 1990
Accession Number
ADA229758

Entities

People

  • Chai AMei Tang
  • Jonathan F. Krall

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Cyclotrons
  • Detuning
  • Dispersion Relations
  • Dispersions
  • Electron Beams
  • Energy
  • Frequency
  • Frequency Shift
  • High Energy
  • Instability
  • Magnetic Fields
  • Military Research
  • Radiation
  • Saturation
  • Stability Conditions
  • Transport Ships

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Pulsed Power and Plasma Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.