Construction of FFAG Accelerators in Kurri for ADS Study

Tanigaki, M.; Mishima, Kenji; Shiroya, Seiji; Ishi, Y.; Fukumoto, S.; Mori, Y.; Machida, S.; Inoue, Makoto

doi:10.1109/pac.2005.1590431

Cited by 13 publications

(17 citation statements)

References 2 publications

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“…Several proton FFAGs have been constructed [15], but their scaling design requires large magnets with a complex variation of field with radius. These two issues limit the ratio of extracted to injected energies in scaling designs to three or less.…”

Section: Alternatives To the Cyclotronmentioning

confidence: 99%

The EMMA non-scaling FFAG project: Implications for intensity frontier accelerators

Owen

2012

AIP Conference Proceedings

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Abstract. EMMA (Electron Model for Many Applications) is a proof-of-principle demonstration of a non-scaling, fixedfield, alternating gradient accelerator (nsFFAG). Although nsFFAGs are related to cyclotrons and scaling FFAGs, the normal requirement is broken that the orbit radius scales with beam energy at all azimuths, meaning that a large energy variation can be provided in a small magnet aperture at the expense of no longer having a constant betatron tune; this has the potential to reduce the cost, and increase the reliability and flexibility of future intensity-frontier accelerators. We present results of commissioning of this accelerator at Daresbury Laboratory and discuss its merits compared to alternative approaches to delivering high-intensity hadron beams, in particular for use as low-cost c. 1 GeV proton drivers for accelerator-driven subcritical reactors and for the DAEDALUS neutrino project.

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Section: Alternatives To the Cyclotronmentioning

confidence: 99%

The EMMA non-scaling FFAG project: Implications for intensity frontier accelerators

Owen

2012

AIP Conference Proceedings

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“…Possibilities offered by FFAG accelerators are of great interest for many applications, like proton [1] or ion beam production, medical neutron (BNCT) [2], spallation source for subcritical reactor operation [3] and unstable particle beam acceleration [4] [5]. FFAG accelerators are thus, since the beginning of this decade [6], subject to intense research and development activities.…”

Section: Introductionmentioning

confidence: 99%

3-D magnetic calculation methods for spiral scaling FFAG magnet design

Planche¹,

Neuvéglise²,

Lancelot³

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Abstract2-D and 3-D magnetic calculation tools and methods have been developed at SIGMAPHI, in collaboration with IN2P3/LPSC, to design spiral FFAG (Fixed Field Alternating Gradient) magnets. These tools are currently being used for RACCAM spiral scaling FFAG magnet design. In the particular case of a spiral gap shaped magnet, a careful magnetic design has to be realized in order to keep both vertical and horizontal tunes constant during acceleration process. Promising results, obtained from tracking in 3-D field maps, demonstrate the efficiency of the horizontal and vertical tune adjustment methods presented in this paper.

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“…For high intensity applications, a proof of principle model with 1 MeV output energy was constructed at KEK [11]. Two scaled-up machines, one a prototype for medical applications [12] and the other for a proton driver to drive a sub-critical reactor (ADSR) [13] were constructed at KEK and Kyoto University, respectively.Both machines follow the scaling FFAG design and have a vertical magnetic field profile given bywhere ϑ = θ − tan δ ln r r 0 , is the generalized azimuthal angle, r is the radial coordinate, θ is the geometrical azimuthal angle, r 0 and B z0 are the reference radius and the vertical magnetic field at the reference radius, respectively. k is the geometrical field index defined as k = r B z ∂B z ∂r .…”

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Scaling Fixed-Field Alternating-Gradient Accelerators with Reverse Bend and Spiral Edge Angle

Machida

2017

Phys. Rev. Lett.

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A novel scaling type of Fixed-Field Alternating-Gradient (FFAG) accelerator is proposed that solves the major problems of conventional scaling FFAGs. This scaling FFAG accelerator combines reverse bending magnets of the radial sector type and a spiral edge angle of the spiral sector type to ensure sufficient vertical focusing without relying on extreme values of either parameter. This new concept makes it possible to design a scaling FFAG for high energy (above GeV range) applications such as a proton driver for a spallation neutron source and an accelerator driven subcritical reactor.Particle accelerators were developed initially as a tool to explore particle physics at the energy frontier. Recently, however, many accelerators have been constructed for other fields of physics mostly with the aim of producing secondary or tertiary particles such as neutrons, muons and neutrinos. A figure of merit in this area is a measure of the number of energetic particles, usually protons, that are used to create secondary or tertiary particles through impact with a production target. The energy of each particle does not have to be as high as in accelerators for research at the energy frontier; instead emphasis is put on the beam intensity, which is always demanding. The research field that this type of accelerator explores is called the intensity frontier, and the accelerator is usually referred to as a proton driver.Considering the cross-section of the secondary and tertiary particle production, the energy range of a proton driver covers a range from a few 100 MeV to some 10's of GeV. Cyclotrons cover the lower end: the machines at PSI and TRIUMF, for example, have just enough energy for neutron and muon production. Linear accelerators (linacs for short) with and without an accumulator ring and rapid cycling synchrotrons (RCS) usually produce beams of a few GeV to produce neutrons most efficiently. ISIS, SNS, the J-Parc RCS and ESS (under construction in Sweden) belong to this category. When protons with energies higher than a few GeV are required for the production of kaons and neutrinos through pions, slow cycling synchrotrons are the only option. BNL-AGS, CERN-PS and J-Parc MR are examples.Fixed-Field Alternating-Gradient (FFAG) accelerators were invented in 1950s and developed over the following years, initially as accelerators for energy frontier physics [1,2]. At the same time, an alternating-gradient synchrotron had been developed and its more compact magnets relative to the FFAGs became a big advantage when looking to increase beam energy, so the objectives of the FFAG accelerator development faded out. Although there were remained pockets of interests on FFAG accelerators, for instance [3][4][5][6][7], little development beyond paper studies took place until the late 1990's when the * shinji.machida@stfc.ac.uk idea of a neutrino factory called for an accelerator that could rapidly accelerate muons before they had time to decay [8][9][10].When FFAGs were invented, it was realized that an important advantage over oth...

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Construction of FFAG Accelerators in Kurri for ADS Study

Cited by 13 publications

References 2 publications

The EMMA non-scaling FFAG project: Implications for intensity frontier accelerators

The EMMA non-scaling FFAG project: Implications for intensity frontier accelerators

3-D magnetic calculation methods for spiral scaling FFAG magnet design

Scaling Fixed-Field Alternating-Gradient Accelerators with Reverse Bend and Spiral Edge Angle

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