Application of the Eigen-Emittance Concept to Design Ultra-Bright Electron Beams
- Los Alamos National Laboratory
- U. Maryland
- LBNL
Using correlations at the cathode to tailor a beam's eigen-emittances is a recent concept made useful by the symplectic nature of Hamiltonian systems such as beams in accelerators. While introducing correlations does not change the overall 6-dimensional phase space volume, it can change the partitioning of this volume into the longitudinal and two transverse emittances, which become these eigen-emittances if all the initial correlations are unwound and removed. In principle, this technique can be used to generate beams with highly asymmetric emittances, such as those needed for the next generation of very hard X-ray free-electron lasers. This approach is based on linear correlations, and its applicability will be limited by the magnitude of nonlinear effects in photoinjectors which will lead to mixing in phase space that cannot be unwound downstream. Here, we review the eigen-emittance concept and present a linear eigen-emittance design leading to a highly partitioned, and transverse ultra-bright, electron beam. We also present numerical tools to examine the evolution of the eigen-emittances in realistic accelerator structures and results indicating how much partitioning is practical.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1011065
- Report Number(s):
- LA-UR-11-10220; TRN: US1102077
- Resource Relation:
- Conference: Particle Accelerator Conference (PAC) 2011 ; 2011-03-28 - 2011-04-01 ; New York, New York, United States
- Country of Publication:
- United States
- Language:
- English
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