Investigation of Transverse Instability of a High-Current Relativistic Electron Beam in a Linear Induction Accelerator
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The article presents the results of studies on the transverse instability of a high-current relativistic electron beam developing in a linear induction accelerator LIA for 5 MeV electron energy, which is created at the BINP SB RAS together with RFNC VNIITF. These results were obtained using a software package that makes it possible to simulate the dynamics of the instability development, as well as to calculate the increment of this instability averaged over the accelerator length. The package consists of four main parts. The first of them, made on the base of a three-dimensional model of the accelerating module electrodynamic system of the LIA, allows calculating the main characteristics of electromagnetic dipole modes of such a module, the second and third parts are designed to find three-dimensional accelerating electric and focusing magnetic fields, respectively. In the last part of the package, a system of ordinary differential equations is solved that describes both the motion of beam macroparticles in electric and magnetic fields, including the eigenmode fields, and the excitation of the mode fields by the electron beam. The adequacy of the physical models used in the software package was tested by comparing the spectra of field oscillations in the accelerator modules obtained in calculations and recorded in the experiment. On the base of the data obtained, the main regularities of the transverse beam instability development in the frequency range ∆f = 0.3–1.1 GHz were revealed, and possible methods for suppressing this instability in the LIA were proposed.
Keywords
linear induction accelerator, high-current relativistic electron beam, beam transverse instability, accelerator module, dipole oscillations
Funding
The main part of the research was carried out at the Institute of Nuclear Physics SB RAS: the works described in sections 3.2 and 3.3 were supported by the Russian Science Foundation (project № 19-12-00212), and in other sections were supported by the Russian Foundation for Basic Research (project № 19-32-90057). Experiments with an electron beam at an energy of 5 MeV were carried out in collaboration with RFNC VNIITF. The authors express their sincere gratitude to A. V. Burdakov, A. V. Arzhannikov, P. V. Kalinin, V. N. Volkov for useful remarks and discussions in the course of the research.
УДК 537.533.7
Investigation of Transverse Instability of a High-Current Relativistic Electron Beam in a Linear Induction Accelerator
0000-0003-0126-7519 The material was received by the Editorial Board: 20.12.2021
Abstract The article presents the results of studies on the transverse instability of a high-current relativistic electron beam developing in a linear induction accelerator LIA for 5 MeV electron energy, which is created at the BINP SB RAS together with RFNC VNIITF. These results were obtained using a software package that makes it possible to simulate the dynamics of the instability development, as well as to calculate the increment of this instability averaged over the accelerator length. The package consists of four main parts. The first of them, made on the base of a three-dimensional model of the accelerating module electrodynamic system of the LIA, allows calculating the main characteristics of electromagnetic dipole modes of such a module, the second and third parts are designed to find three-dimensional accelerating electric and focusing magnetic fields, respectively. In the last part of the package, a system of ordinary differential equations is solved that describes both the motion of beam macroparticles in electric and magnetic fields, including the eigenmode fields, and the excitation of the mode fields by the electron beam. The adequacy of the physical models used in the software package was tested by comparing the spectra of field oscillations in the accelerator modules obtained in calculations and recorded in the experiment. On the base of the data obtained, the main regularities of the transverse beam instability development in the frequency range ∆f = 0.3–1.1 GHz were revealed, and possible methods for suppressing this instability in the LIA were proposed.
Keywords
linear induction accelerator, high-current relativistic electron beam, beam transverse instability, accelerator module, dipole oscillations
Funding
The main part of the research was carried out at the Institute of Nuclear Physics SB RAS: the works described in sections 3.2 and 3.3 were supported by the Russian Science Foundation (project № 19-12-00212), and in other sections were supported by the Russian Foundation for Basic Research (project № 19-32-90057). Experiments with an electron beam at an energy of 5 MeV were carried out in collaboration with RFNC VNIITF. The authors express their sincere gratitude to A. V. Burdakov, A. V. Arzhannikov, P. V. Kalinin, V. N. Volkov for useful remarks and discussions in the course of the research.
УДК 537.533.7
Investigation of Transverse Instability of a High-Current Relativistic Electron Beam in a Linear Induction Accelerator References: Sandalov E. S., Sinitsky S. L., Skovorodin D. I., Nikiforov D. A., Logachev P. V., Bak P. A., Zhivankov K. I., Kenzhebulatov E. K., Petrenko A. V., Nikitin O. A., Akhmetov A. R., Protas R. V., Khrenkov S. D., Zhuravlev I. A., Penzin I. V., Don A. R. Investigation of Transverse Instability of a High-Current Relativistic Electron Beam in a Linear Induction Accelerator. Siberian Journal of Physics. 2022, vol. 17, no. 1. P. 5–22 (in Russ.). DOI: 10.25205/2541-9447-2022-17-1-5-22