Analysis of the first magnetic results of the PSI APPLE X undulators in elliptical polarisation

Liang, Xiaoyang; Calvi, M.; Couprie, M.E.; Ganter, R.; Kittel, Christoph; Sammut, Nicholas; Schmidt, Thomas; Valléau, Mathieu; Zhang, Kai

doi:10.1016/j.nima.2020.164741

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…For the characterization of the APPLE X undulators, the same magnetic measurements technique and equipment, as was used during the characterization of the APPLE X undulators for the Athos soft X-ray beamline at SwissFEL, was used [4,5]. The system contains the following main components: adjustable and longitudinally movable 3D Hall sensor, moving wire system, active Hall sensor position tracking and adjustment system based on two laser beams and two PSDs, two robots for the shimming of the magnets, five axes cam mover positioning system, Beckhoff, TwinCAT based control system.…”

Section: Magnetic Measurement System Overviewmentioning

confidence: 99%

Characterization of helical APPLE X undulators with 90 mm period for the European XFEL

Yakopov

Calvi

Casalbuoni

et al. 2022

J. Phys.: Conf. Ser.

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European XFEL is going to provide full polarization control in the soft X-ray SASE line (SASE3). For this purpose, four helical APPLE X undulators with 90 mm period are installed downstream with respect to the planar undulators of the SASE3 undulator line consisting of 21 planar undulators with 68 mm period. In this contribution, the measurement technique, as well as the results of the measurements and tuning of the APPLE X undulators performed at European XFEL are presented.

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Section: Magnetic Measurement System Overviewmentioning

confidence: 99%

Characterization of helical APPLE X undulators with 90 mm period for the European XFEL

Yakopov

Calvi

Casalbuoni

et al. 2022

J. Phys.: Conf. Ser.

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“…1. It consists of 16 Apple-X undulator modules (Calvi et al, 2017;Schmidt & Calvi, 2018;Liang et al, 2021), each 2 m in length with a period length of 38 mm, with the ability to provide variable undulator field and polarization. The deflection parameter K can be varied up to 3.7 in all polarizations.…”

Section: Introductionmentioning

confidence: 99%

Enhanced X-ray free-electron laser performance with optical klystron and helical undulators

Kittel,

Calvi,

Reiche

et al. 2024

J Synchrotron Radiat

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This article presents a demonstration of the improved performance of an X-ray free-electron laser (FEL) using the optical klystron mechanism and helical undulator configuration, in comparison with the common planar undulator configuration without optical klystron. The demonstration was carried out at Athos, the soft X-ray beamline of SwissFEL. Athos has variable-polarization undulators, and small magnetic chicanes placed between every two undulators to fully exploit the optical klystron. It was found that, for wavelengths of 1.24 nm and 3.10 nm, the required length to achieve FEL saturation is reduced by about 35% when using both the optical klystron and helical undulators, with each effect accounting for about half of the improvement. Moreover, it is shown that a helical undulator configuration provides a 20% to 50% higher pulse energy than planar undulators. This work represents an important step towards more compact and high-power FELs, rendering this key technology more efficient, affordable and accessible to the scientific community.

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“…The soft X-ray beamline of SwissFEL, Athos, started user operation in 2022 (Abela et al, 2019). Athos has an innovative design with flexible undulator modules (Liang et al, 2021) and compact integrated chicanes (CHICs) (Prat et al, 2016), offering an unprecedented control over several FEL properties such as the polarization and the peak power. The modulators presented in this article are used in a two-stage research program Hidden Entangled and Resonating Order (HERO) (Aeppli et al, 2020) to manipulate the driving electron beam with an external laser signal for a better control of the temporal and spectral characteristics of the Athos FEL pulse.…”

Section: Introductionmentioning

confidence: 99%

Versatile modulators for laser-based FEL seeding at SwissFEL

Calvi¹,

Liang²,

Alarcon³

et al. 2023

J Synchrotron Radiat

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The Paul Scherrer Institute is implementing laser-based seeding in the soft X-ray beamline (Athos) of its free-electron laser, SwissFEL, to enhance the temporal and spectral properties of the delivered photon pulses. This technique requires, among other components, two identical modulators for coupling the electron beam with an external laser with a wavelength range between 260 and 1600 nm. The design, magnetic measurements results, alignment, operation and also details of the novel and exotic magnetic configuration of the prototype are described.

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Analysis of the first magnetic results of the PSI APPLE X undulators in elliptical polarisation

Cited by 10 publications

References 14 publications

Characterization of helical APPLE X undulators with 90 mm period for the European XFEL

Characterization of helical APPLE X undulators with 90 mm period for the European XFEL

Enhanced X-ray free-electron laser performance with optical klystron and helical undulators

Versatile modulators for laser-based FEL seeding at SwissFEL

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