Study of irregular electron beam correcting permanent-magnet-quadrupole doublet lens for irradiation accelerator

In this paper, a permanent-magnet-quadrupole doublet lens with strong-focusing is designed and manufactured. Such an instrument could solve the problem of irregular beam spots produced by the weak focusing of conventional solenoid-focusing systems in low-energy electron irradiation accelerators. It...

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Bibliographic Details
Published in:Review of scientific instruments 2023-02, Vol.94 (2), p.023301-023301
Main Authors: Zhou, Zijian, Sheng, Keyan, Zou, Jiabao, Chen, Taiyan, Huang, Jiang
Format: Article
Language:English
Subjects:
Electron beams
Electron irradiation
Focusing
Magnetic fields
Magnetic measurement
Permanent magnets
Quadrupoles
Scientific apparatus & instruments
Solenoids
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Summary:In this paper, a permanent-magnet-quadrupole doublet lens with strong-focusing is designed and manufactured. Such an instrument could solve the problem of irregular beam spots produced by the weak focusing of conventional solenoid-focusing systems in low-energy electron irradiation accelerators. It could provide a better and more appropriate initial beam spot before the beam enters the subsequent magnetic spreading system or magnetic scanning system, thus, improving the irradiation uniformity. The association of the parameters of the rectangular permanent magnet with the quadrupole magnetic field is investigated. Focusing results, obtained using irregular beam spots with different profiles and different energies, and magnetic field measurement results, both from the instrument, verify the engineering feasibility of this permanent-magnet-quadrupole doublet lens.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0113662