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Magnetic System of a Sub-Gigawatt Free-Electron Laser of the Terahertz Range Based on a Kiloampere Beam of Relativistic Electrons

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Radiophysics and Quantum Electronics Aims and scope

We consider the project of a sub-gigawatt free-electron laser (FEL) in the THz range based on a high-current electron beam proposed in 2020 by a scientific collaboration team from G. I.Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences (BINP SB RAS, Novosibirsk) and the Institute of Applied Physics of the Russian Academy of Sciences (Nizhny Novgorod). A new generation of linear induction accelerators (LIA) with a kiloampere current level and an energy of up to 10 MeV, which are capable of forming beams with a high current density and low normalized emittance, is developed at the BINP SB RAS and can be used as a source of an electron beam for such a FEL generator. The objective of our research is to develop and create a FEL generator producing pulses of coherent radiation in the THz range with a sub-GW power level and a record-breaking energy content in a pulse of about 10–100 J. Combination of a high current density of the beam and its long pulse duration (about 100 ns) together with a small spread in the longitudinal electron velocities of the beam opens up the possibility of implementing the FEL scheme in two different types of oversized electrodynamic systems. The first is based on a two-mirror Bragg resonator, in which waves are reflected due to the coupling of the traveling and quasi-critical waves on a corrugated surface. In the second type of the electrodynamic system, a quasi-optical resonator based on the Talbot effect is used. According to the theory, the simulation results, and the data of the cold experiments, both schemes make it possible to ensure a stable regime of narrow-band generation of THz radiation under the conditions of significant cavity oversize, i.e., the ratio of the cavity diameter and the radiation wavelength (ϕ/⋋ > 30–40). The main structural elements of the developed section of the FEL generator and their design parameters are discussed within the framework of this article. When developing the magnetic system of this section, we calculated the time dependence of the spatial configurations of pulsed magnetic field in a helix undulator with a period of d = 10 cm and a length of 2 m, as well as in the solenoid of a quasi-homogeneous magnetic field of the same length intended for compression of the beam cross section before its input in the vacuum channel of the FEL section and for consequent transport of the beam inside it. The presented results of modeling and testing of the manufactured elements for the FEL section will become the basis for the design of a high power FEL generator operated in the frequency range from 0.3 to 1.2 THz.

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Authors and Affiliations

  1. G. I. Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

    E. S. Sandalov, S. L. Sinitsky, A. V. Arzhannikov, V. A. Pavlyuchenko, P. A. Bak, N. S. Ginzburg, P. V. Logachev, I. N. Mescheryakov, D. A. Nikiforov, N. Yu. Peskov, K. K. Ryabchenko & D. I. Skovorodin

  2. E. I. Zababakhin All-Russian Scientific Research Institute of Technical Physics, Snezhinsk, Russia

    R. V. Protas

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  1. E. S. Sandalov
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  2. S. L. Sinitsky
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  6. N. S. Ginzburg
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  13. D. I. Skovorodin
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Correspondence to E. S. Sandalov.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 66, Nos. 7–8, pp. 538–554, July–August 2023. Russian https://doi.org/10.52452/00213462_2023_66_07_538

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Sandalov, E.S., Sinitsky, S.L., Arzhannikov, A.V. et al. Magnetic System of a Sub-Gigawatt Free-Electron Laser of the Terahertz Range Based on a Kiloampere Beam of Relativistic Electrons. Radiophys Quantum El (2024). https://doi.org/10.1007/s11141-024-10323-w

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