Probe measurements of the electron velocity distribution function in beams: Low-voltage beam discharge in helium
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- V. Sukhomlinov
- Department of Physics, St. Petersburg State University 1 , St. Petersburg 198504, Russia
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- A. Mustafaev
- Department of General and Technical Physics, St. Petersburg Mining University 2 , St. Petersburg 199106, Russia
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- N. Timofeev
- Department of Physics, St. Petersburg State University 1 , St. Petersburg 198504, Russia
説明
<jats:p>Previously developed methods based on the single-sided probe technique are altered and applied to measure the anisotropic angular spread and narrow energy distribution functions of charged particle (electron and ion) beams. The conventional method is not suitable for some configurations, such as low-voltage beam discharges, electron beams accelerated in near-wall and near-electrode layers, and vacuum electron beam sources. To determine the range of applicability of the proposed method, simple algebraic relationships between the charged particle energies and their angular distribution are obtained. The method is verified for the case of the collisionless mode of a low-voltage He beam discharge, where the traditional method for finding the electron distribution function with the help of a Legendre polynomial expansion is not applicable. This leads to the development of a physical model of the formation of the electron distribution function in a collisionless low-voltage He beam discharge. The results of a numerical calculation based on Monte Carlo simulations are in good agreement with the experimental data obtained using the new method.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 123 (14), 2018-04-11
AIP Publishing
