Transverse resonance island buckets for synchrotron-radiation based electron time-of-flight spectroscopy

Arion, Tiberiu; Eberhardt, W.; Feikes, J.; Gottwald, Alexander; Goslawski, P.; Hoehl, Arne; Kaser, Hendrik; Kolbe, Michael; Li, J.; Lupulescu, C.; Richter, M.; Ries, Markus; Roth, Friedrich; Ruprecht, Martin; Tydecks, Tobias; Wüstefeld, G.

doi:10.1063/1.5046923

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Then, a beamline accepting only one island spot will see a full signal only every third turn. Such Single Island Population (SIP) has already been used at the Metrology Light Source to increase the revolution time for time-of-flight electron spectroscopy experiments 30 .…”

Section: Resultsmentioning

confidence: 99%

Flipping the helicity of X-rays from an undulator at unprecedented speed

et al. 2020

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X-ray circular dichroism (XMCD), one of the main tools to study magnetism, benefits enormously from the capability of a fast alterable helicity of circularly polarized X-ray photons. Here we present a method for boosting the alternating frequency between right-and left-handed photons to the MHz regime, more than three orders of magnitude faster than state-of-the-art technologies. The method is based on a twin elliptical undulator installed in an electron storage ring being operated in a novel mode where the electron optics is tuned close to a resonance with electrons captured in transverse resonance island buckets. Propagating through the twin undulator, electrons from different islands emit photons of the same wavelength but of opposite helicity. These two helicity components can be alternated as fast as 2 ns. In a proof-of-principle experiment at BESSY II, we demonstrate XMCD at the L 2 , 3 absorption edges of Ni with an 800 ns helicity flip.

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Section: Resultsmentioning

confidence: 99%

Flipping the helicity of X-rays from an undulator at unprecedented speed

et al. 2020

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“…The electron optics are tunable with variable parameters, which are regularly used to generate coherently amplified synchrotron radiation in the THz wavelength range. In a socalled island bucket operation mode, the simultaneous operation of two transversely shifted orbits was demonstrated [4] resulting in a subsequent realization at BESSY II. Moreover, minimized electron energy dispersion with ultralow phase shift factors can realize a quasi-isochronous lattice structure as a basis for so-called steady-state microbunching (SSMB), i.e., coherently amplified undulator emission from laser-induced submicron electron bunches [5].…”

Section: Present Status and Scientific Highlightsmentioning

confidence: 99%

Metrology with synchrotron radiation at PTB

et al. 2022

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The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany and has been using synchrotron radiation (SR) for more than 40 years. Starting at the former facility BESSY I, the storage ring BESSY II (see corresponding article in this volume) has been used for this purpose since 1998, especially in the X-ray range, as well as PTB's own metrology light source (MLS) for lower photon energies since 2008. Both facilities are located in Berlin-Adlershof and are operated by the Helmholtz-Zentrum Berlin within the framework of contractual agreements with PTB. The basic motivation of the work is radiometry. The two storage rings MLS and BESSY II are used as primary source standards and cryogenic radiometers as primary detector standards. The article gives a brief overview of the present status, scientific highlights, the technological development and upgrade plans for the decade 2023–2033 as well as a perspective of next scientific challenges.

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