Speaker
Mr
Bifeng Lei
(Helmholtz Institute Jena)
Description
A plasma channel undulator/wiggler may be created through the plasma wakefield excited by beating of several HermiteGaussian laser modes propagating in a parabolic plasma channel. Control over both the betatron and undulator forces is
conveniently achieved by tuning the amplitude ratios, colors, and order numbers of the modes. A special structure of the
undulator/wiggler field without the focusing force near the propagation axis is generated inside the plasma wakefield by
matching the strengths of the fundamental and the first-order Hermite-Gaussian modes. The electron beam only experiences
forced undulator oscillations in such a field, which significantly improves the quality of the emitted radiation. Since the value
of the undulator strength parameter could be in a wide range, less or larger than unity, it is capable of generating narrow
bandwidth X-ray, as well as the synchrotron-like high-energy X/gamma-ray radiation by harmonics. Additionally, controlling the
relative phases between the laser modes allows for the polarization control of the plasma undulator. High-order harmonics
produced from a circularly polarized plasma undulator clearly show the vortex nature and carry well-defined orbital angular
momentum.
Primary author
Mr
Bifeng Lei
(Helmholtz Institute Jena)
Co-authors
Dr
Carl Schroeder
(Lawrence Berkeley National Laboratory)
Dr
Jingwei Wang
(Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences)
Matt Zepf
(HIJ)
Dr
Sergey Rykovanov
(Center for Computational and Data-Intensive Science and Engineering, Skolkovo Institute of Science and Technology)
Mr
Tom Teter
(Helmholtz Institute Jena)
Dr
Vasily Kharin
(Helmholtz Institute Jena)
