Optimization of an electron gun with an off-axis cathode position

Ovchinnikova, L. Yu.; Shvedunov, V.I.

doi:10.1134/s0020441215030082

Cited by 2 publications

(3 citation statements)

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“…Two versions of a two-electrode electron gun with offaxis cathode placement and electrostatic displacement of the beam to the axis of the accelerating structure described in [20,21] differ in the maximum beam current. Current control in these options is possible only by changing the voltage at the cathode.…”

Section: Electron Gunmentioning

confidence: 99%

“…Different situation takes place with medium and high energy linear electron accelerators for external radiation therapy (18)(19)(20)(21)(22)(23)(24)(25). Currently, the vast majority of such accelerators are manufactured by Varian Medical Systems [8] and Elekta [9].…”

Section: Introductionmentioning

confidence: 99%

“…In carrying out this work, in addition to the experience that we obtained in developing a linear accelerator for the KLT-6 complex, we also used our experience in building electron accelerator with magnetic mirror [15]; race-track microtrons, including with magnetic systems based on rare-earth permanent magnets [16][17][18][19], in which, in some cases, the principle of reflection and re-acceleration of the beam is also used; the experience of developing electron guns with off-axis placement of the cathode and with the electrostatic method of guiding the beam to the axis of accelerating structure [20,21]; as well as the experience of building applied linear electron accelerators for various purposes [22].…”

Section: Introductionmentioning

confidence: 99%

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Electron Accelerator for Radiation Therapy with Beam Energy 6-20 MeV

Ovchinnikova¹,

Shvedunov²

2020

Preprint

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Purpose: To describe a concept of a compact electron accelerator for external radiation therapy with variable energy in the range of 6 -20 MeV, based on linotron principle.Methods: Beam dynamics simulation using the CST and MAD-X code. Various optimization methods of multiparameter problem.Results: Our accelerator differs from the Reflexotron in a number of essential details: a much more compact and more efficient C-band accelerating structure, optimized for the high capture efficiency, narrow energy and phase spectra, and low transverse emittance; magnetic mirror with fixed field based on rare-earth permanent magnets; three-electrode electron gun with off-axis placement of the cathode with a current regulated in the range of two orders of magnitude. These improvements allow the possibility to: adjust the accelerated beam current in a wide range in accordance with the required energy; reduce parasitic losses of the beam current and the associated parasitic radiation; eliminate the risk of setting an erroneous energy value; significantly reduce the dimensions of the accelerator and simplify its operation. Conclusions:We presented the results of calculation of the electron accelerator for external radiation therapy in the energy range of 6 -20 MeV. The accelerator is based on the principle of double beam acceleration in the same accelerating structure, which allows to control the beam energy in a wide range, reduce RF power consumption and the dimensions of the accelerator, and, therefore, reduce its cost. The results can be used to develop the design of the accelerator on the platform of the KLT-6 complex created by ROSATOM.

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Section: Electron Gunmentioning

confidence: 99%