Beam Breakup and Image Displacement Instabilities in High Current Electron Beam Racetrack Induction Accelerators.
Abstract
Beam breakup and image displacement instability growth rates for a 1 kA, 40 MeV electron beam racetrack induction accelerator are computed, The hypothetical device is taken to have four acceleration gaps, each with 0.2 MeV applied voltage and 15 ohm transverse impedance; the guide field is 2 kg. We find that the total amplification of the beam breakup mode is limited to 3.6 provided the cavity mode quality factor Q is 6. Image displacement mode growth is negligible. Thus, the negative mass instability, which grows about three times faster than the beam breakup instability for these parameters, is the dominant stability consideration. Probably, the negative mass instability can be controlled by sufficient spread in the electron energy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1982
- Accession Number
- ADA121632
Entities
People
- B. B. Godfrey
- T. P. Hughes