Advanced Transport Systems for Electron Beams in High Brightness Accelerators and FELs
Abstract
Experiments have been performed to investigate the beam-breakup- instability in electron beam transport through cavity systems. A ten cavity system with solenoidal magnetic transport has been developed. Two accelerators at the University of Michigan are applicable to these experiments: 1) Febetron with long-pulse modules operating at parameters: voltage'--O.4 MV, diode current - 1 kA, extracted current - 20-100 A, and pulse length - 0.3 us. The MELBA accelerator operates at parameters: voltage --0.8 to -lMV, diode current 1-30 KA, extracted current- 0.1 to 0.4 kA, and pulse length- 1-2 us. Initial experiments performed on a 10 cavity system on the Febetron showed 42 dB of RF growth at the TM110 resonance frequency of 2.5 GHz. The experimental growth length is within a factor of two of that predicted by theory. Experiments in the strong focusing regime showed a strong dependence on magnetic field, as expected. Theoretical research has solved the x-y coupled differential equations of the BBU instability and shown that in the strong-focusing regime, the x-y coupling yields two wave modes identical to the 1-D case, except at twice the coupling constant. Theoretical research has also shown that ion channels reduce the BBU growth rate. Electron beams, Accelerators.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 20, 1991
- Accession Number
- ADA253562
Entities
People
- M. L. Brake
- Ronald M. Gilgenbach
- T. Kammash
Organizations
- University of Michigan