Resonant beam extraction scheme with constant separatrix

Hiramoto, Kazuo; Nishi, Makoto

doi:10.1016/0168-9002(92)90023-w

Cited by 43 publications

(13 citation statements)

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“…An RF-driven slow extraction scheme is used in the extraction of protons from the synchrotron ring once they have achieved the appropriate energy. 3 The beam is extracted by using an RF signal with a constant separatrix which has the following features:…”

Section: Iib Acceleratormentioning

confidence: 99%

The M. D. Anderson proton therapy system

et al. 2009

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As with most projects for which a considerable amount of new technology is developed and which have duration spanning several years, at project completion it was determined that several upgrades would improve the overall system performance. Some possible upgrades are discussed. Overall, the system has been very robust, accurate, reproducible, and reliable. The authors found the pencil beam scanning system to be particularly satisfactory; prostate treatments can be delivered on the scanning nozzle in less time than is required on the passive scattering nozzle.

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Section: Iib Acceleratormentioning

confidence: 99%

The M. D. Anderson proton therapy system

et al. 2009

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“…This technique can be used for transferring the beam either to a subsequent machine or towards a target for physics experiments. The latter method is based on the effect of a third-order resonance [1,2]: unstable motion generated by the separatrix joining the three unstable fixed points increases the particles' amplitude. This technique allows beam extraction over many machine turns (typically many thousands), and it is only used when delivering the beam to a target for physics experiments.…”

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confidence: 99%

Novel Method for Multiturn Extraction: Trapping Charged Particles in Islands of Phase Space

Cappi

Giovannozzi

2002

Phys. Rev. Lett.

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A novel method for multiturn extraction from a circular particle accelerator is presented, based on trapping particles into islands of phase space generated by nonlinear resonances. By appropriate use of sextupoles and octupoles, stable islands can be created at small amplitude in phase space. By varying the linear tune, particles can be trapped inside these islands and then transported towards higher amplitudes for extraction. Results of numerical simulations are discussed.

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“…The extraction scheme of the synchrotron is RFdriven slow extraction [5]. Prior to the beam extraction, horizontal tune of the circulating beam is set near the 2/3 resonance line (Ȟ x =0.678).…”

Section: A Compact Proton Synchrotron For Proton Beam Therapymentioning

confidence: 99%

Improvement of extraction efficiency from a compact synchrotron for proton beam therapy by applying particle tracking analysis

Ebina¹,

Umezawa²,

Hiramoto³

2013

AIP Conference Proceedings

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Articles you may be interested inImproving the binding efficiency of quartz crystal microbalance biosensors by applying the electrothermal effect Biomicrofluidics 8, 054116 (2014); 10.1063/1.4898633 Development of the compact proton beam therapy system dedicated to spot scanning with real-time tumortracking technology AIP Conf.Design of a compact, permanent magnet electron cyclotron resonance ion source for proton and H 2 + beam productiona) Rev. Sci. Instrum. 81, 02A321 (2010); 10.1063/1.3267838Compact injector with alternating phase focusing-interdigital H-mode linac and superconducting electron cyclotron resonance ion source for heavy ion cancer therapy Rev. Sci. Instrum. 71, 990 (2000)Abstract. Various types of synchrotrons are used for particle beam therapy. In particle beam therapy, especially in proton beam therapy, downsizing of the accelerator system is a major concern. A compact synchrotron dedicated for proton beam therapy is presented. The synchrotron is horizontally weakly focusing and consists of 4 H-type zerogradient dipole magnets and 4 quadrupole magnets. The circumference of the ring is a little shorter than 18 m, and the energies are up to 230MeV. Beam extraction from the synchrotron is performed by RF-driven slow extraction technology. Two sextupole magnets set in adjacent straight sections form a horizontal separatrix which is fixed during the beam extraction. Horizontal RF voltage excites betatron oscillation of the circulating beam, and protons exceeding the separatrix are extracted by an electrostatic deflector and a horizontal septum dipole magnet. To achieve adequately high extraction efficiency, the relationship between the extraction efficiency and the horizontal chromaticity of the ring is analyzed by particle tracking simulation. The horizontal chromaticity with maximum extraction efficiency is half of the theoretical value because of the distortion of the horizontal separatrix for the extraction. With this chromaticity, the spiral-step of the extracted particle is independent of the momentum deviation of the particle, and the separatrix across the electrostatic septum electrodes is superpositioned.

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Resonant beam extraction scheme with constant separatrix

Cited by 43 publications

References 0 publications

The M. D. Anderson proton therapy system

The M. D. Anderson proton therapy system

Novel Method for Multiturn Extraction: Trapping Charged Particles in Islands of Phase Space

Improvement of extraction efficiency from a compact synchrotron for proton beam therapy by applying particle tracking analysis

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