Demonstration of a High-Field Short-Period Superconducting Helical Undulator Suitable for Future TeV-Scale Linear Collider Positron Sources

Scott, D J; Clarke, Jim; Baynham, D.E.; Bayliss, V.; Bradshaw, T.; Burton, Greg; Brummitt, A.; Carr, S.B.; Lintern, A.; Rochford, J.; Taylor, O.; Ivanyushenkov, Y.

doi:10.1103/physrevlett.107.174803

Cited by 28 publications

(15 citation statements)

References 16 publications

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“…Further developments of planar SCUs for 3GSRs are ongoing at ANKA (Boffo et al 2011), APS (Ivanyushenkov et al 2013), DIAMOND (Clarke et al 2013), and other places. SCUs are evaluated for future light sources as well, and they are objects of extensive studies in high-energy accelerator projects such as the ILC (Scott et al 2011).…”

Section: Superconducting Undulatorsmentioning

confidence: 99%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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Periodic magnetic structures, i.e., undulators and wigglers, have been used for nearly 40 years as sources of brilliant synchrotron radiation. Today, sophisticated undulator designs provide many degrees of freedom such as photon beam energy, variable polarization, and orbital angular momentum. Specific designs efficiently suppress higher orders or reduce the on-axis power density. All tuning parameters are required to be freely accessible by the users. Still, the majority of undulators is based on permanent magnets with a clear trend to short periods and in-vacuum and cryogenically cooled systems. Similar designs are used for storage rings and free electron lasers, though the field quality requirements are different. Today, the optimization of a specific experiment follows a global approach. This includes not only the undulator design itself but also local lattice modifications to cope with ambitious designs, elaborate tracking schemes to estimate the impact on the dynamic aperture, and last but not least radiation propagation tools which transport a realistic photon beam phase space to the sample. This chapter summarizes the theory of undulator radiation and reviews the technological realization of undulators and wigglers. Operational issues are discussed, as well.

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Section: Superconducting Undulatorsmentioning

confidence: 99%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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“…A positron yield of 1.5 e + /e − is desired. Prototype studies [2] showed that superconducting undulators with period λ = 11.5 mm and K factors up to 0.92 are possible.…”

Section: Introductionmentioning

confidence: 99%

“…Copper and tungsten are the considered materials for masks. The uncertainty of the undulator B-field used in the realistic case for the studies here is based on the size of the B-field errors measured from helical undulator prototypes [2].…”

Section: Introductionmentioning

confidence: 99%

Power Incident on the ILC Helical Undulator Walls

Alharbi¹,

Riemann²,

Moortgat‐Pick³

et al. 2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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An undulator-based positron source is proposed for the future International Linear Collider (ILC): the high-intense electron beam passes through a helical undulator to produce a multi-MeV circularly polarized photon beam before it is directed to the interaction point (IP). The photon beam strikes a thin target to produce electron-positron pairs. A maximum active undulator length of 231 m is expected to be appropriate for the ILC center-of-mass energy range E cm ≥ 250 GeV. Since the photon produced by the undulator is created with an opening angle, some of these photons will hit the superconducting undulator wall. Therefore, photon masks must be installed along the undulator line to keep the power deposited into the undulator walls due to the synchrotron radiation (primary photons) at an acceptable level (1 W/m). This paper will discuss the power deposited into the undulator walls due to the primary photons and secondary particles. Masks inserted in the undulator line are discussed, assuming ideal and realistic undulator fields. In terms of materials, copper or tungsten are considered in detail.

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“…The undulator field strength, although not a determining parameter for the wavelength, must be sufficiently high to maintain the brilliance of the radiation, especially that of the harmonics, and the gain of amplification in FELs at a high level with a short-period undulator and low-energy electron beam. In addition, the use of multi-MeV gamma rays from highfield, short-period undulators to generate polarized positron beams via particle-antiparticle pair production in future linear colliders has been proposed [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic property of a staggered-array undulator using a bulk high-temperature superconductor

Kinjo

Mishima

Choi

et al. 2014

Phys. Rev. ST Accel. Beams

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The magnetic field of a staggered-array undulator using a bulk high-temperature superconductor is calculated by analytical and numerical methods. Analytical formulas for the undulator field and the solenoid field required to generate the undulator field are derived from a simple two-dimensional model. The analytical calculation shows the degree of dependence of these fields on the undulator parameters, the generation of a high undulator field proportional to the critical current density of the bulk superconductor, and the good tunability of the undulator field over a wide range of values. The numerical calculation is performed in a three-dimensional geometry by two methods: the center field and energy minimization methods. The latter treats the current distribution inside the bulk, whereas the former neglects it as a natural extension of the analytical model. The calculation also reveals the dependence of the fields on the undulator parameters arising from the current distribution. From the comparison with experimental results, we find that the latter method reproduces the experimental results well, which indicates the importance of the current distribution inside the bulk. Therefore, we derive a semiempirical formula for the required solenoid field by modifying the analytical formula using the numerical results so as to include the effect of the current distribution. The semiempirical formula reproduces the numerical result with an error of 3%. Finally, we estimate the magnetic performance of the undulator as an example of using the formulas and values presented in this paper. The estimation shows that an undulator field twice as large as that of the present in-vacuum undulator but with an equal period and gap can be obtained at a temperature of approximately 20-40 K, and that deflection parameters (K values) of 1 and 2 can be achieved with periods of 5 and 10 mm at approximately 4-20 K.

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Demonstration of a High-Field Short-Period Superconducting Helical Undulator Suitable for Future TeV-Scale Linear Collider Positron Sources

Cited by 28 publications

References 16 publications

Shaping Photon Beams with Undulators and Wigglers

Shaping Photon Beams with Undulators and Wigglers

Power Incident on the ILC Helical Undulator Walls

Magnetic property of a staggered-array undulator using a bulk high-temperature superconductor

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