FFAG-based Accelerator for Radio-Isotopes Production (original) (raw)
Related papers
Orbit Properties of Non Scaling FFAG Accelerators Using Constant Gradient Magnets
22Nd Particle Accelerator Conference, 2007
Very high momentum compaction can be obtained in non-scaling FFAG accelerators using constant-gradient magnets with their field strengths decreasing outwardssufficiently high that the magnet apertures (and vacuum chamber) need be little wider than in a strong-focusing synchrotron. Such machines are of great potential interest for applications in the 0.1-50 GeV energy range requiring higher pulse repetition rates or intensities than synchrotrons can provide. Explicit formulae have been developed for the equilibrium orbit properties, particularly their momentum dependence, in various lattices, and give accurate enough results to provide a useful tool for choosing the magnet parameters. In this paper the dependences of orbit offset and circumference on momentum are explored for doublet lattices, and numerical results from the formulae are compared with those from lattice codes.
2004
A signature of fixed-field acceleration is that the orbit of the beam centroid unavoidably changes with energy. The corresponding change in pathlength results in phase slip relative to the fixed-frequency accelerating waveform. Nevertheless, depending on the location of the fixed-points of the motion, synchronous or asynchronous cross-crest acceleration is possible for a limited number of turns. The possibility of asynchronous rf can be understood simply by realizing that for acceleration in a single pass, the initial cavity phases can be set to exactly compensate for the phase slip. The present work explores the influence of the path-length fixed points and of rf manipulations on the longitudinal dynamics in FFAGs.
Investigation of a Compact Accelerator for Radioisotope Production
2018
In this thesis the design and performance of a non-linear non-scaling Fixed Field Alternating Gradient (FFAG) accelerator is described. The imagined application of the design is for radioisotope production and in particular the production of 99mTc and 211At. The performance of the design in combination with an internal target and recycled beam, is also investigated as a potential way to increase isotope yields. The basic design consists of four separate radial sector magnets and two RF cavities. The design differs from a conventional cyclotron in that the edge angles have been optimised with the field gradient to produce a lattice that is isochronous to �0.15% and has stabilised tunes. Simulations conducted using the OPAL code showed that the dynamic apertures are large, peaking at 150 and 41.4 � m mrad in the horizontal and vertical planes respectfully. Acceleration with protons is possible at up the 5th harmonic with 100 kV/turn accelerating gradient and at the 1st harmonic for al...
SETTING THE BEAM ONTO THE REFERENCE ORBIT IN NON SCALING FFAG ACCELERATORS
2010
Described in the paper are systematic procedures to inject and keep the beam on the reference trajectory for a fixed energy, as applied to the EMMA non scaling FFAG accelerator. The notion of accelerated orbits in FFAG accelerators has been introduced and some of their properties have been studies in detail.
In a fixed-field alternating-gradient (FFAG) accelerator, eliminating pulsed magnet operation permits rapid acceleration to synchrotron energies, but with a much higher beam-pulse repetition rate. Conceived in the 1950s, FFAGs are enjoying renewed interest, fuelled by the need to rapidly accelerate unstable muons for future high-energy physics colliders. Until now a ‘scaling’ principle has been applied to avoid beam blow-up and loss. Removing this restriction produces a new breed of FFAG, a non-scaling variant, allowing powerful advances in machine characteristics. We report on the first non-scaling FFAG, in which orbits are compacted to within 10 mm in radius over an electron momentum range of 12–18 MeV/c. In this strictly linear-gradient FFAG, unstable beam regions are crossed, but acceleration via a novel serpentine channel is so rapid that no significant beam disruption is observed. This result has significant implications for future particle accelerators, particularly muon and high-intensity proton accelerators.
Beam optics and dynamics of FFAG accelerators—application of TPSA and polymorphism—
AIP Conference Proceedings
As a versatile accelerator, especially for application with high repetition and high current beams, the FFAG (Fixed Field Alternating Gradient) synchrotron attracts growing attention. We will discuss the design procedure and beam dynamics study from a modern view based on recent progress in high-energy accelerators. Comparison between brute force tracking with direct use of 3D field mapping data and a newly introduced way modeling the entire field region with a collection of thin elements is presented.