Ken Peach

Abstract:

Charged Particle Therapy (the use of protons and other light ions such as carbon to treat certain forms of cancer) is experiencing a rapid expansion in many parts of the world, and there are now more than 30 such centres operating in hospitals. The current technologies available use cyclotrons and synchrotrons to deliver the dose to the cancer. While each of these technologies is mature, and capable of treating cancer successfully, there is always room for improvement in technique, to reduce costs, increase throughput and availability and improve outcomes. This talk will discuss some recent development, using both traditional and laser-based accelerator techniques. © 2011 SPIE.

Abstract:

A new design principle of a nonscaling fixed field alternating gradient accelerator is proposed. It is based on optics that produce approximate scaling properties. A large field index k is chosen to squeeze the orbit shift as much as possible by setting the betatron oscillation frequency in the second stability region of Hill's equation. Then, the lattice magnets and their alignment are simplified. To simplify the magnets, we expand the field profile of rk into multipoles and keep only a few lower order terms. A rectangular-shaped magnet is assumed with lines of constant field parallel to the magnet axis. The lattice employs a triplet of rectangular magnets for focusing, which are parallel to one another to simplify alignment. These simplifications along with fringe fields introduce finite chromaticity and the fixed field alternating gradient accelerator is no longer a scaling one. However, the tune excursion of the whole ring can be within half an integer and we avoid the crossing of strong resonances. © 2010 The American Physical Society.

Abstract:

Giving a good talk on science is a skill that can be learnt like any other: in this book we take the reader through the process of presenting science to a wide ...