Abstract
The undulator is a critical component to produce synchrotron radiation and free electron laser. When a Bessel light beam carrying the orbit angular momentum co-propagates with an electron beam, a net transverse deflection force will be subjected to the electron beam. As a result of dephasing effect, the deflection force will oscillate acting as an undulator. For such a laser based undulator, the period length can reach sub-millimeter level, which will greatly reduce the electron energy for the required X-ray production.
Highlights
A magnetostatic undulator is in periodic structures of dipole magnets [1,2]
When a Bessel light beam carrying the orbit angular momentum copropagates with an electron beam bunch, a net transverse deflection force will be subjected to the latter one
The static magnetic field of the undulator is perpendicular to the electron beam trajectory, and periodically changes its directions, which causes an electron beam bunch to follow an undulating trajectory, the energy radiations
Summary
A magnetostatic undulator is in periodic structures of dipole magnets [1,2]. The static magnetic field of the undulator is perpendicular to the electron beam trajectory, and periodically changes its directions, which causes an electron beam bunch to follow an undulating trajectory, the energy radiations. The K value of an undulator should be in order of 1 To this end, the shorter the period length, the higher the peak magnetic field should be. The laser plasma undulator [16,17] was just proposed to build the submillimeter period undulator, but the fact that the electrons do not pass through free space may prevent its use in storage rings In another area, the light beam carrying orbital angular momentum (OAM) discovered in the early 1990s in Laguerren-Gaussian beams [18,19] has attracted myriad modern interests. With the advent of a high power laser, it is possible to achieve a K value of around 1 for the Bessel light beam undulator (BLU) with a period length approaching submillimeter. For BLU, the interaction distance is much longer and higher flux can be produced comparing to LCS
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