Undulators Consisting of Magnetized Helices

Magory, Eyal; Balal, Nezah; Bratman, V. L.

doi:10.1109/ted.2021.3138712

Cited by 7 publications

(4 citation statements)

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“…For example, in the XFEL-UC concept [1], this is a micro-undulator with a period of down to 3 mm and a field of 1 T. To do this, it is supposed to use a planar structure of Halbach lattices [2], assembled from solid combs of equally magnetized elements [3]. For the same purpose, we consider Halbach-type helical undulators of helices, each of which, like the combs in [1], is made of a single piece of ferromagnetic material [4]. Compared to a planar system, with the same gap for electron transport, a helical undulator provides a significantly larger rms oscillatory velocity and, consequently, a higher radiation efficiency or particle acceleration at a shorter length.…”

Section: Permanent Helical Undulators From Helicesmentioning

confidence: 99%

“…An obvious generalization of the planar Halbach undulators [2] to the case of helical geometry is a set of four alternating axially and radially magnetized helices with a width of a quarter of the undulator period d each (Fig. 1) [4]. The magnitude B of a helically polarized field on the axis of such undulator formed by infinite helices of a rectangular cross section is [4] Here, Br is the remnant magnetization of the ferromagnetic, 𝐾 1 (𝜉) and 𝐾 1 ′ (𝜉) are a first-order Macdonald function and its derivative, ℎ = 2𝜋/𝑑, 𝜉 1,2 = ℎ𝑅 1,2 , 𝑅 1,2 are the inner and outer helix radii.…”

Section: Permanent Helical Undulators From Helicesmentioning

confidence: 99%

“…1) [4]. The magnitude B of a helically polarized field on the axis of such undulator formed by infinite helices of a rectangular cross section is [4] Here, Br is the remnant magnetization of the ferromagnetic, 𝐾 1 (𝜉) and 𝐾 1 ′ (𝜉) are a first-order Macdonald function and its derivative, ℎ = 2𝜋/𝑑, 𝜉 1,2 = ℎ𝑅 1,2 , 𝑅 1,2 are the inner and outer helix radii.…”

Section: Permanent Helical Undulators From Helicesmentioning

confidence: 99%

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Permanent Helical Undulators with Strong Fields

Bamberg,

Magory,

Balal

et al. 2024

J. Phys.: Conf. Ser.

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Undulators containing magnetized rare-earth helices can provide a significantly higher oscillatory electron velocity than the widely used planar Halbach undulators. Using Wire Electrical Discharge Machining (WEDM), it is possible to manufacture NdFeB helices with a period of 1 mm or less with high accuracy. In this work, we describe the results of manufacturing and studying prototypes of undulators in the form of one or two axially and radially magnetized helices. More efficient hybrid systems of two axially oppositely magnetized and two steel non-premagnetized helices with a field on the axis of the order of 1 T are also shown. Micro-undulators of this type can significantly increase the efficiency of XFELs and Inverse FELs.

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Section: Permanent Helical Undulators From Helicesmentioning

confidence: 99%

Section: Permanent Helical Undulators From Helicesmentioning

confidence: 99%

Section: Permanent Helical Undulators From Helicesmentioning

confidence: 99%

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Permanent Helical Undulators with Strong Fields

Bamberg,

Magory,

Balal

et al. 2024

J. Phys.: Conf. Ser.

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“…According to calculations, the helical undulators from magnetized rare earth helices proposed in [1] make it possible to obtain stronger fields than planar undulators. Thus, a Halbach-like set of four alternately longitudinally and radially magnetized helices (Fig.…”

Section: New Variants Of Permanent Helical Undulatorsmentioning

confidence: 99%

Helical Undulators of Magnetized Helices and Ring Sectors

Magory,

Balal,

Bratman

2024

J. Phys.: Conf. Ser.

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The periodic system of a spiral array of magnetized ring sectors (quasi-helix) creates a helical field, which is close in structure and magnitude to the field in the system of helical magnets. Such a system of a relatively small number of readily accessible magnets can be easier to manufacture and assemble than a system containing mag-netized helices made from single pieces. In this paper, we study the dependence of the helical field on the number of sectors per undulator period. Short prototypes consisting of longitudinally and radially magnetized sectors were experimentally studied. The maximum value of the helical field on the axis of a quasi-helix of longitudinally and radially magnetized ring NdFeB sectors with a period of 2 cm and a relatively large inner diameter of 8 mm is 0.28 T and 0.34 T, respectively. This corresponds to a field of 0.74 T in the case of four alternately longitudinally and radially magnetized Halbach-like quasi-helices of pre-magnetized sectors and a hybrid system assembled from longitudinally pre-magnetized sectors and preliminarily non-magnetized steel sectors. Such undulators can provide a high oscillatory electron velocity and seem promising for increasing the efficiency of FELs and inverse FELs in various frequency ranges.

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