Development of a Radiotherapy System Based on 6 MeV Linac and Cone-Beam Computer Tomograph

Rod’ko, I. I.; Sarychev, G. A.; Balakirev, P. V.; Bondarenko, T. V.; Dergacheva, I. L.; Evteev, A. S.; Kovalev, S. N.; Koloskov, S. A.; Krylova, T. A.; Lobzhanidze, T. K.; Polikhov, S. A.; Smirnov, V.; Sharkov, G.; Горлачев, Г. Е.; Гулидов, И. А.; Иванов, С. А.; Каприн, А. Д.; Romanko, Yu. S.; Khmelevskii, E. V.; Ovchinnikova, L. Yu.; Shvedunov, V.I.; Cherednichenko, D. V.

doi:10.1007/s10512-019-00490-9

Cited by 3 publications

(4 citation statements)

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“…As compared with other known projects of the same type [1,2], C-band (5712 MHz) accelerating system developed in Lomonosov Moscow State University [3] for radiation therapy complex KLT-6 designed by Research Institute of Technical Physics and Automation [4] has significantly higher accelerating gradient. High accelerating gradient in the system, up to 40 MeV/m in the regular part, is due not only to the requirement of having a small size of the system, but as well to the requirement of switching the accelerated beam energy from 6 MeV (used for tumor treatment) to 2.5 MeV (for obtaining a portal image) by changing the accelerating gradient.…”

Section: Introductionmentioning

confidence: 95%

Dark current issues for high gradient C-band medical linac

et al. 2021

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Simulations of dark current emission for C-band linear accelerating structure were performed taking into account the electric field distributions inside the cavities and the field enhancement factor. Matching calculated dark current energy spectra with the experimentally measured ones made it possible to understand the nature of the dark current and to reveal the areas of the accelerating structure requiring improved surface treatment. Microscopic investigation of the copper accelerating cell surface treated using different techniques showed that gas cluster ion beam irradiation results in the best surface smoothness. Furthermore, it removes the surface insulating layers and prevents from subsequent oxidizing. Both effects can significantly reduce the dark current emission.

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Section: Introductionmentioning

confidence: 95%

Dark current issues for high gradient C-band medical linac

et al. 2021

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“…The klystron pulsed RF power P kl required to obtain the pulsed beam power P b at the bremsstrahlung target is determined by the expression: P kl = P b + P loss + P coll + P w + P r + P wg (5) where P b = E b I b , E b is the energy, I b is the pulsed current at the target, P loss is the losses of the beam power in the accelerating structure, P coll is the beam power losses at the collimators, P w is the RF power losses in the walls of the accelerating structure, P r is reflected RF power, P wg is the RF power losses in the waveguide and ferrite isolator. The RF power losses in the accelerating structure walls does not depend on the final energy of the beam, since the accelerating structure during the first passage provides a fixed energy of 10 MeV and amounts to P w ≈ 2.7 MW.…”

Section: Rf Power Estimation and Choice Of The Coupling With The Feed...mentioning

confidence: 99%

“…The authors of this work took part in the development of a 6 MeV linear accelerator for the KLT-6 radiation therapy complex designed by ROSATOM [5]. The linear accelerator is based on the C-band accelerating structure, 225 mm long, powered by a compact multi-beam klystron with a focusing system based on rare-earth permanent magnets with a maximum RF power of 3.6 MW [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…This paper presents the results of a full 3D computer simulation of electron accelerator for external radiation therapy for energy, regulated in the range of 6 -20 MeV, based on linotron principle. Due to high efficiency of RF energy utilization, the accelerator can be built on the 6 MeV accelerator platform of the KLT-6 complex [5], i.e. using all its systems, with the exception of the accelerating structure and the electron gun, and with the addition of the necessary magnetic systems.…”

Section: Introductionmentioning

confidence: 99%

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

Ovchinnikova¹,

Shvedunov²

2020

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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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