Mechanisms for nonlinear acceleration in FFAGs with fixed RF

Koscielniak, Shane; Johnstone, C.

doi:10.1016/j.nima.2003.12.028

Cited by 17 publications

(7 citation statements)

References 6 publications

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“…Since the acceleration time is so short, the rf frequency cannot be synchronized with beam revolution frequency. Therefore, the so-called ''gutter acceleration'' scheme is employed which uses a flow outside an rf bucket of a fixed frequency in longitudinal phase space [12,13]. Lattice parameters are chosen such that the path length depends on momentum quadratically.…”

Section: Accelerator and Beam Modelmentioning

confidence: 99%

Orbit and optics distortion in fixed field alternating gradient muon accelerators

Machida

Kelliher

2007

Phys. Rev. ST Accel. Beams

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In a linear nonscaling fixed field alternating gradient (FFAG) accelerator, betatron tunes vary over a wide range and a beam has to cross integer and half-integer tunes several times. Although it is plausible to say that integer and half-integer resonances are not harmful if the crossing speed is fast, no quantitative argument exists. With tracking simulation, we studied orbit and optics distortion due to alignment and magnet errors. It was found that the concept of integer and half-integer resonance crossing is irrelevant to explain beam behavior in a nonscaling FFAG when acceleration is fast and betatron tunes change quickly. In a muon FFAG accelerator, it takes 17 turns for acceleration and the betatron tunes change more than 10, for example. Instead, the orbit and optics distortion is excited by random dipole and quadrupole kicks. The latter causes beam size growth because the beam starts tumbling in phase space, but not necessarily with emittance growth.

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Section: Accelerator and Beam Modelmentioning

confidence: 99%

Orbit and optics distortion in fixed field alternating gradient muon accelerators

Machida

Kelliher

2007

Phys. Rev. ST Accel. Beams

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“…The transverse scanning is provided at the end of the gantry $3-4 m above the patient. Also for cancer therapy, Koscielniak and Johnstone (2004) propose a single-stage LNS (Linear Non-Scaling) FFAG (with 14 F0D0 cells and C ¼ 40 m) that accelerates carbon ions (and protons, too) from 18 to 400 MeV u À1 . Their design introduces a powerful new feature: The magnets are wedge-shaped, with opening angles chosen so that edge focusing compensates and minimizes the variation in tunes.…”

Section: The Pamela Projectmentioning

confidence: 99%

Ffag

Mori

2014

Comprehensive Biomedical Physics

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“…6 [10,11]. It is not possible to modulate rf frequency because a particle stays in a ring only 10 to 20 turns which corresponds to 15 to 30 µs even in the muon ring.…”

Section: Outside Bucket Accelerationmentioning

confidence: 99%

The EMMA Project

Machida¹

2008

AIP Conference Proceedings

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EMMA stands for Electron Model of Muon Accelerator and is expected to demonstrate that a nonscaling FFAG can accelerate a beam quickly with large acceptance in both transverse and longitudinal directions, that is necessary for muon acceleration. We will study resonance crossing and outside bucket acceleration in detail. The concept of EMMA has been considered and designed over the last several years. Recently the project was funded and construction started at the STFC Daresbury Laboratory in April 2007. The first beam should be in the ring in summer 2009. We will discuss its backgrounds and aims, beam dynamics issues, and current hardware status.

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Mechanisms for nonlinear acceleration in FFAGs with fixed RF

Cited by 17 publications

References 6 publications

Orbit and optics distortion in fixed field alternating gradient muon accelerators

Orbit and optics distortion in fixed field alternating gradient muon accelerators

Ffag

The EMMA Project

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