End magnets with rare earth permanent magnet material for a compact race-track microtron

Vladimirov, I. Yu.; Pakhomov, N. I.; Shvedunov, V.I.; Kubyshin, Yu. A.; Rigla, J. P.; Захаров, В. В.

doi:10.1140/epjp/i2014-14271-3

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…It is important to keep in mind that in a 180 • bending magnet, an error of 1 mrad means a relative difference of the field integrals along the two halves of the trajectory in the magnet at a level of just 3 × 10 −4 . Usually, in RTMs for applied purposes, the field inhomogeneity that is primarily caused by edge effects and a strayed field in the drift space is noticeably higher [38]. In addition to errors in the bending angle, other errors that are caused by imprecisions in the magnet positioning are of great importance.…”

Section: Errors In Magnets Manufacturing and Magnet Poles Positioningmentioning

confidence: 99%

“…Active and passive magnetic screens to control the strayed field in the drift space are also used. Other important aspects of the design, building, and adjusting of an RTM magnetic system include high accuracy field measurements in manufactured magnets and beam tracing in the measured fields that is conducted using existing programs for numerical simulations of the beam dynamics that take into account the position of the axis of the accelerating structure [38]. If necessary, the pole shimming is used as a local field correction technique.…”

Section: Errors In Magnets Manufacturing and Magnet Poles Positioningmentioning

confidence: 99%

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Racetrack Microtron—Pushing the Limits

et al. 2021

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We consider three types of electron accelerators that can be used for various applications, such as industrial, medical, cargo inspection, and isotope production applications, and that require small- and medium-sized machines, namely classical microtron (CM), race-track microtron (RTM), and multisection linac. We review the principles of their operation, the specific features of the beam dynamics in these machines, discuss their advantages and weak points, and compare their technical characteristics. In particular, we emphasize the intrinsic symmetry of the stability region of microtrons. We argue that RTMs can be a preferable choice for medium energies (up to 100 MeV) and that the range of their potential applications can be widened, provided that the beam current losses are significantly reduced. In the article, we analyze two possible solutions in detail, namely increasing the longitudinal acceptance of an RTM using a higher-order harmonic accelerating structure and improving beam matching at the injection.

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Section: Errors In Magnets Manufacturing and Magnet Poles Positioningmentioning

confidence: 99%

Section: Errors In Magnets Manufacturing and Magnet Poles Positioningmentioning

confidence: 99%

Racetrack Microtron—Pushing the Limits

et al. 2021

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“…Obviously, in order to accurately set the values of the magnetic field induction in the median plane during the tuning process, individual magnets must contain tuning elements of one or another design. These issues, in particular, were considered in [26].…”

Section: B Magnets Calculationmentioning

confidence: 99%

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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“…Let φ 0 and E 0 be the particle phase and energy at the injection; that is, just before its first passage through the AS. We would like to note that, in some pulsed RTM, the electrons reverse their trajectory in special reverse field magnets after the injection and first acceleration at the AS [18,48]. In that case, E 0 is the energy after the first acceleration and reflection of the beam in the end magnet, before the second passage through the AS, but we will still use the term injection energy.…”

Section: The Rtm Modelmentioning

confidence: 99%

“…This is the case of applications like the cargo inspection or Intraoperative Radiation Therapy for which RTMs allow to get pulsed and continuous beams in a quite cost and energy effective way with the most optimal dimensions of the machine. An example of such accelerator is a compact 12 MeV RTM which is under construction at the Technical University of Catalonia in collaboration with the Moscow State University and CIEMAT (Spain) [1,18,48].…”

Section: Introductionmentioning

confidence: 99%

Stability of the phase motion in race-track microtrons

Kubyshin

Larreal

Ramírez-Ros

et al. 2017

Physica D: Nonlinear Phenomena

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We model the phase oscillations of electrons in race-track microtrons by means of an area preserving map with a fixed point at the origin, which represents the synchronous trajectory of a reference particle in the beam. We study the nonlinear stability of the origin in terms of the synchronous phase —the phase of the synchronous particle at the injection. We estimate the size and shape of the stability domain around the origin, whose main connected component is enclosed by an invariant curve. We describe the evolution of the stability domain as the synchronous phase varies. We also clarify the role of the stable and unstable invariant curves of some hyperbolic (fixed or periodic) points.Peer ReviewedPostprint (author's final draft

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End magnets with rare earth permanent magnet material for a compact race-track microtron

Cited by 4 publications

References 15 publications

Racetrack Microtron—Pushing the Limits

Racetrack Microtron—Pushing the Limits

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

Stability of the phase motion in race-track microtrons

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