Characterisation of permanent magnetic quadrupoles for focussing proton beams

Melone, Joseph and Ledingham, Kenneth and McCanny, Thomas and Burriss-Mog, T and Schramm, Ulrich and Grötzschel, R and Akhmadaliev, S and Hanf, D and Spohr, Klaus M. and Bussmann, M and Cowan, T and Wiggins, Mark and Mitchell, Martin (2012) Characterisation of permanent magnetic quadrupoles for focussing proton beams. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 676. pp. 126-134. ISSN 0168-9002 (https://doi.org/10.1016/j.nima.2012.02.014)

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Abstract

High intensity laser driven proton beams are at present receiving much attention. The reasons for this are many but high on the list is the potential to produce compact accelerators. However, two of the limitations of this technology is that unlike conventional nuclear RF accelerators lasers produce diverging beams with an exponential energy distribution. A number of different approaches have been attempted to monochromise these beams but it has become obvious that magnetic spectrometer technology developed over many years by accelerator physicists to transport and focus proton beams could play an important role for this purpose. This paper deals with the design and characterisation of a magnetic quadrupole system which is intended to focus and transport laser-accelerated proton beams.

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