Optical design of the CEBAF beam transport system
Abstract
Recent modifications to the beam transport system design are described. These include: detailing of injector optics and inclusion of an isochronous injection chicane in order to avoid bunch lengthening during injection, use of a staircase spreader/recombiner design in order to reduce error sensitivity, use of 1 GHz RF separators for separation and extraction of multiple beams to reduce emittance dilution, and modification of the beam transport system to accommodate a fifth recirculation of the beam. The isochronicity of the injector chicane design and the choice of a lower frequency for the RF separator extraction system have made the machine phase space design values inherently more achievable. The new staircase spreader/recombiner design has reduced sensitivity to lattice errors by a factor of two. This gain in reduced sensitivity is offset by the increased lattice error sensitivity of the five-pass design over that for the previous four-pass design.
- Publication:
-
Unknown
- Pub Date:
- 1989
- Bibcode:
- 1989odcb.rept.....D
- Keywords:
-
- Beam Injection;
- Beam Splitters;
- Continuous Radiation;
- Electron Accelerators;
- Electron Beams;
- Electron Optics;
- Isochromatics;
- Linear Accelerators;
- Structural Design;
- Emittance;
- Lattice Parameters;
- Radio Frequencies;
- Sensitivity;
- Nuclear and High-Energy Physics