| Title |
Tunable High-Gradient Quadrupoles for a Laser-Plasma Acceleration-Based FEL |
| Authors |
- A. Ghaith, F. Blache, M.-E. Couprie, C.A. Kitegi, F. Marteau, P. N'gotta, M. Valléau, J. Vétéran
SOLEIL, Gif-sur-Yvette, France
- C. Benabderrahmane
ESRF, Grenoble, France
- O. Cosson, F. Forest, P. Jivkov, J.L. Lancelot
Sigmaphi, Vannes, France
|
| Abstract |
The magnetic design and characterization of tunable high gradient permanent magnet based quadrupole, are presented. To achieve a high gradient field with a compact structure, permanent magnets are chosen rather than usual electro-magnets due to their small aperture. The quadrupole structure consists of two quadrupoles superimposed capable of generating a gradient of 210 T/m. The first quadrupole is composed of permanent magnets following a Halbach configuration shaped as a ring attaining a constant gradient of 160T/m, and the second of four permanent magnet cylinders surrounding the ring and capable of rotating around their axis to achieve a gradient tunability of ±50 T/m. Each tuning magnet is connected to a motor and is controlled independently, enabling the gradient to be tuned with a rather good magnetic center stability (±20 μm) and without any field asymmetry. Seven quadrupoles have been built with different magnetic lengths in order to fulfil the integrated gradient required. A set of QUAPEVA triplet are now in use, to focus a high divergent electron beam with large energy spread generated by a laser plasma acceleration source for a free electron laser application.
|
| Paper |
download WEP064.PDF [3.352 MB / 4 pages] |
| Export |
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| Conference |
FEL2017, Santa Fe, NM, USA |
| Series |
International Free Electron Laser Conference (38th) |
| Proceedings |
Link to full FEL2017 Proccedings |
| Session |
Poster III |
| Date |
23-Aug-17 15:30–17:30 |
| Main Classification |
Undulators, Photon Diagnostics, Beamline |
| Keywords |
ion, quadrupole, electron, laser, permanent-magnet |
| Publisher |
JACoW, Geneva, Switzerland |
| Editors |
Kip Bishofberger (LANL, Los Alamos, NM, USA); Bruce Carlsten (LANL, Los Alamos, NM, USA); Volker RW Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-179-3 |
| Published |
February 2018 |
| Copyright |
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