Generation of X-ray twisted photons in helical undulators

by Prof. Dmitry Karlovets (Max Planck Institute for Nuclear Physics)

Tuesday 17 Jan 2023, 13:00 → 14:00 Europe/Berlin

XHQ/E1.173

Classical electrodynamics predicts that an electron in the magnetic field of a storage ring or a helical undulator emits radiation in the form of cylindrical waves. After the quantization, such a field consists of the so-called twisted photons with an orbital angular momentum. The quantum picture of this process is much more complex due to entanglement between the photon and the electron. I give a QED description of the twisted-photon generation in helical undulators, intense magnetic fields and lasers, and I also elucidate what should and what should not be done with the electron to guarantee vorticity of the photons. A helical undulator with a relativistic electron beam (similar to that of SASE3) seems to be an excellent setup to generate twisted photons from UV to X-ray range to probe spiral biological structures, chiral molecules, weak quadrupole transitions in atoms, etc. The hard X-ray twisted photons can become a useful tool in nuclear and particle physics for probing the structure and spin of hadrons and nuclei, and for mimicking the processes in such astrophysical objects like the neutron stars.

 

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