Advanced Transport Systems for Electron Beams in High-Brightness Accelerators and FELs
Abstract
Research has concentrated on the excitation and stabilization of the beam-breakup (BBU) instability in high current, long-pulse electron beam transport through microwave cavity systems. Electron beams are generated by the Michigan Electron Long Beam Accelerator (MELBA) at parameters: 0.7 to 0.8 MV, I injected =40-400 A, and pulselength - 0.5 microsecs. Major accomplishments include: (1) Successful excitation of the beam-breakup (BBU) instability by microwave priming of the first cavity of a ten-RF cavity system, (2) Measurements of BBU growth as a function of priming frequency, confirming that the TM110 BBU mode was responsible for the growth, (3) Characterization of the BBU growth rate as a function of magnetic field and e-beam current, (4) The first experiments demonstrating that external-coupled-cavities reduce the growth rate for the BBU instability, and (5) Development of a theory for the beam breakup instability in quadrupole and solenoidal electron beam transport systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 24, 1992
- Accession Number
- ADA253314
Entities
People
- M. L. Brake
- R. M. Gilgenbach
- T. Kammash
Organizations
- University of Michigan