Variable high gradient permanent magnet quadrupole (QUAPEVA)

High gradient quadrupoles are necessary for different applications such as laser plasma acceleration, colliders, and diffraction limited light sources. Permanent magnet quadrupoles provide a higher field strength and compactness than conventional electro-magnets. An original design of permanent magn...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2017-06
Main Authors: Marteau, F, N'gotta, P, Benabderrahmane, C, Ghaith, A, Valléau, M, Loulergue, A, Vétéran, J, Sebdaoui, M, André, T, G Le Bec, Chavanne, J, Vallerand, C, Oumbarek, D, Cosson, O, est, F, Jivkov, P, Lancelot, J L, Couprie, M E
Format: Article
Language:English
Subjects:
Computer simulation
Cylinders
Divergence
Field strength
Free electron lasers
Laser plasmas
Lasers
Light diffraction
Light sources
Magnetic measurement
Magnetism
Permanent magnets
Plasma acceleration
Quadrupoles
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:High gradient quadrupoles are necessary for different applications such as laser plasma acceleration, colliders, and diffraction limited light sources. Permanent magnet quadrupoles provide a higher field strength and compactness than conventional electro-magnets. An original design of permanent magnet based quadrupole (so-called "QUAPEVA"), composed of a Halbach ring placed in the center with a bore radius of 6 mm and surrounded by four permanent magnet cylinders capable of providing a gradient of 210 T/m, is presented. The design of the QUAPEVAs, including magnetic simulation modeling, and mechanical issues are reported. Magnetic measurements of seven systems of different lengths are presented and confirmed the theoretical expectations. The variation of the magnetic center while changing the gradient strength is +/- 10 micrometer. A triplet of three QUAPEVA magnets are used to focus a beam with large energy spread and high divergence that is generated by Laser Plasma Acceleration source for a free electron laser demonstration.
ISSN:2331-8422
DOI:10.48550/arxiv.1706.04355