The synchrotron radiation source PETRA III and its future ultra-low-emittance upgrade PETRA IV

Schroer, Christian G.; Wille, Hans‐Christian; Seeck, O. H.; Bagschik, Kai; Schulte‐Schrepping, H.; Tischer, M.; Graafsma, H.; Laasch, W.; Baev, Karolin; Klumpp, S.; Bartolini, R.; Reichert, H.; Leemans, Wim; Weckert, E.

doi:10.1140/epjp/s13360-022-03517-6

Cited by 9 publications

(7 citation statements)

References 57 publications

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“…The images presented here show the potential for low-dose imaging of biological samples. With new storage ring designs that promise large increases in hard X-ray brightness at synchrotron radiation facilities 10 , 33 , our results imply that scanning Compton X-ray microscopy should be viable for imaging biological and soft-matter samples at resolutions better than 10 nm.…”

Section: Discussionmentioning

confidence: 87%

Dose-efficient scanning Compton X-ray microscopy

Dresselhaus

Ivanov

et al. 2023

Light Sci Appl

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The highest resolution of images of soft matter and biological materials is ultimately limited by modification of the structure, induced by the necessarily high energy of short-wavelength radiation. Imaging the inelastically scattered X-rays at a photon energy of 60 keV (0.02 nm wavelength) offers greater signal per energy transferred to the sample than coherent-scattering techniques such as phase-contrast microscopy and projection holography. We present images of dried, unstained, and unfixed biological objects obtained by scanning Compton X-ray microscopy, at a resolution of about 70 nm. This microscope was realised using novel wedged multilayer Laue lenses that were fabricated to sub-ångström precision, a new wavefront measurement scheme for hard X rays, and efficient pixel-array detectors. The doses required to form these images were as little as 0.02% of the tolerable dose and 0.05% of that needed for phase-contrast imaging at similar resolution using 17 keV photon energy. The images obtained provide a quantitative map of the projected mass density in the sample, as confirmed by imaging a silicon wedge. Based on these results, we find that it should be possible to obtain radiation damage-free images of biological samples at a resolution below 10 nm.

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Section: Discussionmentioning

confidence: 87%

Dose-efficient scanning Compton X-ray microscopy

Dresselhaus

Ivanov

et al. 2023

Light Sci Appl

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show abstract

“…The images presented here show the potential for low-dose imaging of biological samples. With new storage ring designs that promise large increases in hard X-ray brightness at synchrotron radiation facilities 10,32 , our results imply that scanning Compton X-ray microscopy should be viable for imaging biological and soft-matter samples at resolutions better than 10 nm.…”

Section: Discussionmentioning

confidence: 89%

Dose-efficient Scanning Compton X-ray Microscopy

Bajt¹,

Li²,

Dresselhaus³

et al. 2023

Preprint

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The highest resolution of images of soft matter and biological materials is ultimately limited by modification of the structure, induced by the necessarily high energy of short-wavelength radiation. Imaging the inelastically scattered X-rays at a photon energy of 60 keV (0.02 nm wavelength) offers greater signal per energy transferred to the sample than coherent-scattering techniques such as phase-contrast microscopy and projection holography. We present images of dried, unstained, and unfixed biological objects obtained by scanning Compton X-ray microscopy, at a resolution of about 40 nm. This microscope was realised using novel wedged multilayer Laue lenses that were fabricated to sub-ångström precision, a new wavefront measurement scheme for hard X rays, and efficient pixel-array detectors. The doses required to form these images were as little as 0.02% of the tolerable dose and 0.05% of that needed for phase-contrast imaging at similar resolution using 12 keV photon energy. The images obtained provide a quantitative map of the projected mass density in the sample, as confirmed by imaging a silicon wedge. Based on these results, we find that it should be possible to obtain radiation damage-free images of biological samples at a resolution below 10 nm.

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“…PETRA IV at DESY will be a fourth-generation synchrotron light source, relying on an ultralow emittance ring to achieve an extremely high brightness [1]. Given the usual 10 percent beam size stability requirement [2,3], the intended ultra-low emittance implies stringent orbit stability.…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of fast corrector magnets for PETRA IV

Christmann,

De Gersem,

von Tresckow

et al. 2024

J. Phys.: Conf. Ser.

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The new synchrotron light source PETRA IV at DESY will use a fast orbit feedback system with hundreds of fast corrector magnets to meet stringent orbit stability requirements. These magnets are operated at high frequencies, creating strong eddy currents that result in Joule losses and a time delay between applied voltage and aperture field. User experiments impose challenging requirements on beam operation to preserve the point of the radiation source. To meet the demanding feedback requirements, finite element simulations are needed to understand the characteristics of the corrector magnet. However, due to the small skin depths at high frequencies and the laminated structure of the yoke, these simulations need a very fine mesh and are thus very costly. Therefore, we homogenize the laminated yoke which reduces the computational effort but captures the eddy current effects accurately. The reduction of simulation times from several hours to a few minutes allows us to conduct extensive studies of the eddy current losses and the field quality of the magnets.

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The synchrotron radiation source PETRA III and its future ultra-low-emittance upgrade PETRA IV

Cited by 9 publications

References 57 publications

Dose-efficient scanning Compton X-ray microscopy

Dose-efficient scanning Compton X-ray microscopy

Dose-efficient Scanning Compton X-ray Microscopy

Finite element simulation of fast corrector magnets for PETRA IV

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