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74 / 2024-07-30 10:36:32
Study of Fringe Field Transformations of Short Permanent Magnet Quadrupole Focusing Lens
Fringing field transformation,permanent magnet quadrupole,magnetic field gradient,mechanical length
5.Electrotechnical Theory and New Electromagnetic Technology > 3.Other topics in electrotechnical technology
终稿
Zhenyi Zhang / Huazhong University of Science and Technology
Zijian Zhou / Huazhong University of Science and Technology
Jiang Huang / Huazhong University of Science and Technology;School of Electrical and Electronic Engineering
Quadrupole magnet is an important element in the beam transport and manipulation. Permanent magnet quadrupole (PMQ) lenses appear frequently in various beamline attributed to their compact structure. In this paper, a method applicable to the fringing field transformation of a short permanent magnet quadrupole lens is proposed. The large electron beam envelope error, which occurs during the focusing process of short PMQ lenses, has been addressed. This achieved by replacing sharp cut-off fringing field with multi-rectangle cut-off fringing field. The causes of fringe field transformation errors are investigated by theoretical calculations of beam dynamics. The law of magnetic field gradient curve change of a short PMQ lens is analyzed. The scale parameters in the multi-rectangle approximation method are optimized by multi-particle tracking and finite element simulation. Applying the method to PMQ lenses of varying mechanical lengths confirms the feasibility and universality of the multi-rectangle approximation method for PMQ fringe field transformation.

 
重要日期

  • 会议日期

    11月06日

    2024

    至

    11月08日

    2024

  • 09月15日 2024

    初稿截稿日期

  • 11月08日 2024

    注册截止日期

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Huazhong University of Science and Technology
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