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Permanent Magnet-Based Quadrupoles for Plasma Acceleration Sources

Synchrotron SOLEIL, 91190 Saint-Aubin, France
Author to whom correspondence should be addressed.
Instruments 2019, 3(2), 27;
Received: 12 February 2019 / Revised: 23 March 2019 / Accepted: 17 April 2019 / Published: 23 April 2019
PDF [14514 KB, uploaded 14 May 2019]


The laser plasma accelerator has shown a great promise where it uses plasma wakefields achieving gradients as high as GeV/cm. With such properties, one would be able to build much more compact accelerators, compared to the conventional RF ones, that could be used for a wide range of fundamental research and applied applications. However, the electron beam properties are quite different, in particular, the high divergence, leading to a significant growth of the emittance along the transport line. It is, thus, essential to mitigate it via a strong focusing of the electron beam to enable beam transport. High-gradient quadrupoles achieving a gradient greater than 100 T/m are key components for handling laser plasma accelerator beams. Permanent magnet technology can be used to build very compact quadrupoles capable of providing a very large gradient up to 500 T/m. We present different designs, modeled with a 3D magnetostatic code, of fixed and variable systems. We also review different quadrupoles that have already been built and one design is compared to measurements. View Full-Text
Keywords: quadrupoles; permanent magnets; laser plasma acceleration; free electron laser quadrupoles; permanent magnets; laser plasma acceleration; free electron laser

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Ghaith, A.; Oumbarek, D.; Kitégi, C.; Valléau, M.; Marteau, F.; Couprie, M.-E. Permanent Magnet-Based Quadrupoles for Plasma Acceleration Sources. Instruments 2019, 3, 27.

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