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Nicholaos Tsoupas (Brookhaven national Laboratory), Dr Francois Meot (Brookhaven ational laboratory)19/11/2019, 09:00
The CBETA project [1] is the first and unique of its kind electron accelerator which combines two accelerator concepts together. The Energy Recovery Linac (ERL) and the Fixed Field Alternating Gradient (FFA_G) concepts. The CBETA project is currently in the commissioning stage and some of the beam optics of the accelerator has be done using lamp-magnet methods to describe the fields of the...
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Dr Yoshihiro Ishi (KURNS, Kyoto university)19/11/2019, 09:45
Current status and future plans of the FFA main ring at KURNS will be presented.
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Hidefumi Okita (Kyoto University)19/11/2019, 11:00
Intense negative muon is useful for reduction and recycling the radioactive wastes from nuclear plants. As an intense negative muon source, MERIT(Multiplex Energy Recovery Internal Target) scheme was proposed. To prove the principle of the MERIT scheme, FFA ring (MERIT-PoP ring) has been developed and the beam experiment was carried out. In this presentation, the detail of this study will be reported.
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Prof. Yoshiharu Mori (Kyoto University)19/11/2019, 11:45
A new scheme for muon production and acceleration with FFAG is presented.
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Shinji Machida (STFC RAL)19/11/2019, 14:00
As a future upgrade option of the ISIS neutron and muon source, we consider FFA as a proton driver. Vertical excursion FFA (vFFA) was chosen because of compact and less complex structure of the main lattice magnets although the maximum field is relatively high. As a proof of principle of the vFFA concept, a prototype machine to accelerate from 3 to 12 MeV is being designed. We will discuss the...
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Shinji Machida (STFC RAL)19/11/2019, 14:30
Vertical excursion FFA's (vFFA) momentum compaction factor is zero like linac. That makes the machine isochronous for ultra-relativistic particles. Applications of vFFA for muon accumulation and acceleration were considered. It would be ideal as a muon accumulator of the LEMMA scheme and a muon accelerator of collider complex. We will discuss the design and issues.
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Dr Jean-Baptiste Lagrange19/11/2019, 14:45
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Dr Rogers Chris19/11/2019, 16:00
Existing FFAs use fixed field injection systems, possibly using charge exchange foils. In synchrotrons it is more conventional to use pulsed magnets to bring beam into the ring in addition to the charge exchange injection. In this presentation the use of a pulsed magnet system is considered for injection into horizontal and vertical FFAs proposed for ISIS upgrades. Simulation of the lattices...
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Mr Kyosuke Adachi (kyushu university)19/11/2019, 16:45
The purpose of this study is a basic research for an optical design of the Vertical FFA. This study proposed a New method of an orbit analysis using an approximate transfer matrix and verified. In addition to this, I report current progress of a design electromagnet with Opera3d.
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Stephen Brooks (BNL)19/11/2019, 17:30
Fixed-field accelerators with vertical orbit excursion (VFFAs) have the interesting property that the matched beam orbit shape, circumference and optics stay constant with beam momentum. This requires magnets with a vertically exponential field $B_y=B_0 e^{ky}$ on the $x=0$ midplane. This paper presents prototype measurements of such a magnet, along with a lattice using similar magnets that...
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Stephen Brooks (BNL)20/11/2019, 09:00
Beam commissioning is currently in progress for the CBETA ERL recently built at Cornell University in collaboration with BNL. This machine has a 6MeV injector and 36MeV main superconducting RF module at ~1.3GHz frequency. The beam is designed to pass through the main RF up to four times accelerating and four times decelerating, before being dumped at 6MeV. These four energies (42, 78, 114,...
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Prof. Yoshiharu Mori (Kyoto University)20/11/2019, 09:45
Triton FFA 2-way collider for efficient muon production for muon catalyzed fusion has been designed. Characteristics and expected performance of the ring are presented.
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Dr Carol Johnstone (Fermilab)20/11/2019, 11:00
A compact, isochronous fixed-field, gradient ion accelerator, ~1.5 meters in radius, is under design utilizing high-gradient cavities in order to accelerate multi-ion species up to 15-20 MeV/u with large turn-to turn, centimeter-level separation for low-loss extraction without the need for lossy foil stripping. A strong-focusing radial field profile is optimized in a separated-sector format...
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Dr Jean-Baptiste Lagrange20/11/2019, 11:45
Precise neutrino cross section measurements and search for sterile neutrinos can be done with neutrino beams produced from muons decaying in a storage ring due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has three options: a...
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Dr Carol Johnstone (Fermilab)20/11/2019, 14:00
Rapid cycling synchrotrons are limited in duty cycle from ramped magnetic fields, with 50-60Hz the current or practical technical state of the art. To achieve a higher cycling rate requires fixed magnetic fields. A strong-focusing proton synchrotron with fixed magnetic fields and swept-frequency RF (53 MHz at extraction) has been proposed to replace the present 8 GeV Fermilab Booster...
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Suzie Sheehy (University of Melbourne)20/11/2019, 14:45
In this talk I will give an overview of activities in the new Medical Accelerator Physics group particularly in the area of FFA accelerators. Australia is rapidly moving toward realisation of their first proton therapy facilities and a national working group has been convened to plan for a heavy ion (p, He, C, etc) treatment and research facility. Together with CERN and other European partners...
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Jaroslaw Pasternak (Imperial College London/RAL-STFC)20/11/2019, 16:00
LhARA (Laser hybrid Accelerator for Radiobiological Applications) aims to provide multi-ion beams for in-vitro and in-vivo radiobiological studies to inform the next generation radiotherapy. As the source of ion beams a thin target irradiated by high power laser will be used followed by a capture and transport system based on Gabor Lenses. In the next stage of the project FFA accelerator is...
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Tomonori Uesugi (KURNS)20/11/2019, 16:45
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Francois Meot (Brookhaven National Laboratory)21/11/2019, 09:00
A zgoubi workshop - actually, more of a "zgoubi tutorial" - was organized in Boulder, CO, last August (https://zgoubi-workshop.com/), latest one in a long series which started in the early 2000s with the re-birth of FFAG science and happened to cover EMMA at Daresbury, FFAG schools, CBETA prototyping today, etc. The Boulder workshop gathered 20 attendees, who bent and sweat during four days...
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Andreas Adelmann (Paul Scherrer Institut)21/11/2019, 09:45
After a general introduction of OPAL, I will introduce a set of new features available with version 2.0 [1]. All new features will be presented together with examples of ongoing research projects. In the OPAL-cyc flavour, a robust way of generating matched distributions with linear space charge is introduced. A new method for describing fixed field accelerators (FFAs) in a very general way...
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Mr Matthias Frey21/11/2019, 11:00
In this talk the new adaptive mesh refinement capability of OPAL including the implementation of the hardware architecture independent Poisson solver is presented. This new feature enables to study neighbouring bunch effects in circular machines more precisely with the benefit of lower computational costs compared to standard Particle-In-Cell simulations of same resolution.The numerical model...
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Andreas Adelmann (Paul Scherrer Institut)21/11/2019, 11:45
Precise accelerator simulations are powerful tools in the design and optimization of exiting and new charged particle accelerators. We all know from experience, the computational burden of precise simulations often limits their use in practice. This becomes a real hurdle when requiring real time computation. I will demonstrate two techniques, based on Polynomial Chaos Expansion [1] and Deep...
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Jochem Snuverink21/11/2019, 14:00
The usage of numerical models to study the evolution of particle beams is an essential step in the design process of particle accelerators. However, uncertainties of input quantities such as beam energy and magnetic field lead to simulation results that do not fully agree with measurements, hence the final machine will behave differently compared to the simulations. In case of cyclotrons such...
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Oscar Roberto BLANCO-GARCIA (LNF/INFN)21/11/2019, 14:45
LEMMA is studying the possibility of a future muon collider where muons are produced from positrons impinging on a target. Unlike conventional muon sources, muons are produced with a very small emittance, however, a small population is produced due to the small cross section of the e+e- annihilation into muons. In order to increase the muon beam population, we are currently designing a muon...
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David Kelliher21/11/2019, 16:00
Abstract: Longitudinal tomography, already well established in synchrotrons, involves reconstructing the phase space using bunch monitor data obtained for a sufficient number of turns in a synchrotron oscillation. In this presentation it is shown how this technique can be adapted for the FFA case. The resulting tomography code is used to reconstruct the longitudinal phase space using data...
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Christian Baumgarten (PSI - Paul Scherrer Institut)21/11/2019, 16:45
We discuss the main factors that influence the space charge induced vortex
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motion of particles within high intensity bunches (Gordon 1969)
in isochronous circular machines.
Firstly a phase slip due to deviations from strict isochronism determines
if the bunches of a specific turn are above, below or at "transition",
and hence whether stable vortex motion of the bunches is possible at... -
Bin Qin (Huazhong University of Science and Technology)
The novel superconducting (SC) gantry has become a research hotspot with the tendency of compact proton therapy system. The footprint and weight of the gantry can be significant reduced by using SC magnets, and alternating gradient field of local achromatic bending sectors provides large momentum acceptance which means the magnetic field of SC magnets can remain fixed during tumor treatment....
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