Reduction of dynamic multipole content in insertion devices using flat wires

Chung, Ting-Yi; Huang, Szu-Jung; Chiu, Mau-Sen; Kuo, Chun‐Yan; Chen, Sei-Da; Li, Yi-Ta; Jan, Jyh-Chyuan; Hwang, Ching-Shiang

doi:10.1088/1742-6596/1067/3/032026

Cited by 1 publication

(1 citation statement)

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“…The effect of transverse field roll-off can be countered by either passive method such as use of iron shims or active method like passing current through long flat wires running along undulator length [9,10,13,14]. For DLS system, the active method of using extended quadrupole correction(EQC) coil is considered to be a convenient solution.…”

Section: Extended Quadrupole Correction Coilsmentioning

confidence: 99%

Compensation scheme for non-linear beam defocusing inside planar undulator

et al. 2021

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The Delhi Light Source (DLS), is a compact THz facility based on the principle of pre-bunched FEL, which is at the commissioning stage at Inter University Accelerator Centre (IUAC), New Delhi. The facility will produce relativistic electron beam in the energy range 4 to 8 MeV to generate THz radiation in the range 0.18–3.0 THz. To study the effect of the undulator U48 on this low energy range of the electron beam, a 3D field map of U48 was generated with the help of measured magnetic field data. Beam tracking simulations were performed with the generated field map at the minimum gap of U48. Simulations showed that the quadrupole component of the transverse field roll-off, which is the dominant component within the width of the vacuum chamber can introduce a substantial growth of the beam size in the wiggling plane and result in severe beam loss while propagating through the vacuum chamber inside the undulator. To compensate the dynamic quadrupolar field, an extended quadrupole field correction coil was implemented in the simulation by superimposing its field on the magnetic field of U48. Such a correction scheme showed a remarkable improvement to contain the beam transverse growth.

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Section: Extended Quadrupole Correction Coilsmentioning

confidence: 99%