FFAGS for rapid acceleration

Johnstone, C.; Koscielniak, Shane

doi:10.1016/s0168-9002(03)00997-5

Cited by 18 publications

(18 citation statements)

References 11 publications

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“…Such a machine has been contemplated for a number of applications: muon acceleration for a neutrino factory or muon collider [1][2][3][4], high-power proton drivers [5,6], medical accelerators [7][8][9]6,10], and other applications [11,12]. The most extensive studied of these applications is the muon acceleration application, and was therefore used as a basis for the design of the EMMA main ring.…”

Section: Goals Of the Experiments And Latticementioning

confidence: 99%

The EMMA Main Ring Lattice.

Berg¹

2008

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Section: Goals Of the Experiments And Latticementioning

confidence: 99%

The EMMA Main Ring Lattice.

Berg¹

2008

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“…With C and ring cost proportional to LN and RF voltage and cost of the RF installation proportional to L/N, there is an optimum value of N, when the two cost components are equal. Various lattices of non-scaling FFAG rings for accelerating muons have already been proposed [3,4,5,6,7,8,12,13]. Below, we develop lattices of two types.…”

Section: Ffag Rings For Muon Accelerationmentioning

confidence: 99%

“…The acceleration must be fast (compared to a muon decay time) and that precludes acceleration in the normal manner; namely acceleration by putting the particles inside an RF bucket and adiabatically changing the bucket parameters. For muons, as was first realized by Berg [17,18] and Johnstone and Koscielniak [5,19], the acceleration must be outside buckets. We explore the restrictions this imposes in Section 2.1.…”

Section: Introduction 2 Accelerator Physics Issuesmentioning

confidence: 97%

Muon acceleration in FFAG rings

Keil

Sessler

2005

Nuclear Instruments and Methods in Physics Research Section A:

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Muon acceleration from 6 or 10 GeV to 20 GeV in fixed-field alternating gradient (FFAG) rings is considered in this paper. The novel physics issues associated with non-scaling FFAG machines, namely the very acceleration process and the crossing of transverse imperfection resonances are addressed. These FFAG machines are essentially strong-focusing rings with a dispersion small enough to keep muons over the full momentum range inside the same magnet aperture. We consider two cases: (i) A ring which we call Modified FODO with straight sections, just long enough -about a metre -to house normal-conducting RF cavities operating at about 200 MHz and (ii) A ring which we call Doublet Lattice with longer straight sections, long enough -a few metres -to house super-conducting RF cavities also at about 200 MHz (and with enough space for decay of the magnetic fields in neighbouring components to a level of about 10 mGauss). Parameters are derived for the lattice and RF system of an electron model. It accelerates electrons from about 10 to 20 MeV and allows one to study the critical issues of non-scaling FFAGs. For both a full machine and a model, lattice parameters such as magnet type and dimension, spacing, and number of cells are presented. The consequences of misaligned magnets are studied by simulation. Practical RF system design issues, e.g. RF power, and the limit on the bunch population due to beam loading are estimated.We These FFAG machines are essentially strong-focusing rings with a dispersion small enough to keep muons over the full momentum range inside the same magnet aperture. We consider two cases: (i) A ring which we call Modified FODO with straight sections, just long enough -about a metre -to house normal-conducting RF cavities operating at about 200 MHz and (ii) A ring which we call Doublet Lattice with longer straight sections, long enough -a few metres -to house super-conducting RF cavities also at about 200 MHz (and with enough space for decay of the magnetic fields in neighbouring components to a level of about 10 mGauss). Parameters are derived for the lattice and RF system of an electron model. It accelerates electrons from about 10 to 20 MeV and allows one to study the critical issues of non-scaling FFAGs. For both a full machine and a model, lattice parameters such as magnet type and dimension, spacing, and number of cells are presented. The consequences of misaligned magnets are studied by simulation. Practical RF system design issues, e.g. RF power, and the limit on the bunch population due to beam loading are estimated.

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“…The Japanese approach (KEK) [5], for example, supports a radial-sector FFAG accelerator, but only in the context of a single-muon bunch and low frequency, broadband rf. Recent breakthroughs [6] have resulted in a new design for a FFAG accelerator that can support a high-frequency bunch train, which applies to the U.S. scenario.…”

Section: Acceleration In a Neutrino Factorymentioning

confidence: 99%

“…This effect limits the number of turns that can be supported under conditions of rapid acceleration when the rf phase cannot be adjusted on a corresponding timescale. Consequently, a dramatic reduction in rf voltage is not gained using the FFAG, but there has been some improvement evidenced in recent work [6].…”

Section: Fixed Field Alternating Gradient (Ffag) Acceleratorsmentioning

confidence: 99%

Optimization and beam control in large-emittance accelerators: neutrino factories

Johnstone

Berz

Errede

et al.

2003 IEEE International Workshop on Workload Characterization (IEEE Cat. No.03EX775)

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Schemes for intense sources of high-energy muons require collection, rf capture, and transport of particle beams with unprecedented emittances, both longitudinally and transversely. These large emittances must be reduced or "cooled" both in size and in energy spread before the muons can be efficiently accelerated. Therefore, formation of muon beams sufficiently intense to drive a Neutrino Factory or Muon Collider requires multi-stage preparation. Further, because of the large beam phase space which must be successfully controlled, accelerated, and transported, the major stages that comprise such a facility: proton driver, production, capture, phase rotation, cooling, acceleration, and storage are complex and strongly interlinked. Each of the stages must be consecutively matched and simultaneously optimized with upstream and downstream systems, meeting challenges not only technically in the optics and component design, but also in the modeling of both new and extended components. One design for transverse cooling, for example, employs meter-diameter solenoids to maintain strong focusing-300-500 mr beam divergencesacross ultra-large momentum ranges, ≥ ±20% δp/p, defying conventional approximations to the dynamics and field representation. To now, the interplay of the different systems and staging strategies has not been formally addressed. This work discusses two basic, but different approaches to a Neutrino Factory and how the staging strategy depends on beam parameters and method of acceleration.

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FFAGS for rapid acceleration

Cited by 18 publications

References 11 publications

The EMMA Main Ring Lattice.

The EMMA Main Ring Lattice.

Muon acceleration in FFAG rings

Optimization and beam control in large-emittance accelerators: neutrino factories

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