The Potential of an Ultimate Storage Ring for Future Light Sources

Bei, M.; Borland, M.; Cai, Yunhai; Elleaume, P.; Gerig, R.; Harkay, K.; Emery, L.; Hutton, A.; Hettel, R.; Nagaoka, R.; Robin, D.; Steier, C.

doi:10.1016/j.nima.2010.01.045

Cited by 50 publications

(21 citation statements)

References 23 publications

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“…The octupole Hamiltonian can be expanded for small deviations from design momentum ¼ Áp=p and written as H 4 ¼ b 4 4 ½1 À þ 2 þ Oð 3 Þ ðx 4 À 6x 2 y 2 þ y 4 Þ; (C1) where b 4 is the normalized integrated strength of a regular octupole. In most lattices many octupoles will be…”

Section: Appendix C: Octupole Hamiltonianmentioning

confidence: 99%

“…A new generation of rings (PETRA III [1], NSLS-II [2], MAX IV [3]) is characterized by a natural emittance 1 nm rad and significant impact of insertion devices on the radiation equilibrium. Lattices for an ''ultimate light source'' with emittance in the pm rad range providing fully diffraction-limited photon beams are being studied (see, for example, [4][5][6][7][8]). …”

Section: Introductionmentioning

confidence: 99%

“…Inserting this into Eq. (C1), the Hamiltonian can be expanded to second order in momentum H 4 ¼ b 4 4 fðoctÞ þ ½ÀðoctÞ þ 4 ðsextÞ þ 2 ½ðoctÞ À 4 ðsextÞ þ 6 2 ðquadÞ g þ Oð 3 Þ;…”

mentioning

confidence: 99%

See 2 more Smart Citations

Perspectives for future light source lattices incorporating yet uncommon magnets

Leemann

Streun

2011

Phys. Rev. ST Accel. Beams

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Although octupoles, decapoles, and longitudinal gradient bending magnets (LGB) have been studied for many years, they are not usually included in light source lattices. They can, however, be beneficial in order to realize ultralow emittance and attain sufficient dynamic aperture. We present methods for achieving ultralow emittance and discuss optimization of the nonlinear dynamics with multipoles. We demonstrate how control of amplitude-dependent tune shift makes octupoles a powerful tool for dynamic aperture optimization. Control of higher-order chromaticity by octupoles and decapoles is straightforward; however, since this turns out to be not quite as efficient in high-brightness lattices with low arc dispersion, we apply it to a conventional lattice to demonstrate the potential. This paper also illustrates how high-field LGBs can be used to build a compact, bright hard x-ray source. Finally, we demonstrate in detail the application of octupoles as integral components of the MAX IV 3 GeV storage ring lattice.

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Section: Appendix C: Octupole Hamiltonianmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Perspectives for future light source lattices incorporating yet uncommon magnets

Leemann

Streun

2011

Phys. Rev. ST Accel. Beams

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“…While ultimate storage rings, being diffraction-limited X-ray sources, are still under development (Bei et al, 2010), present third-generation synchrotrons are partially coherent sources (Vartanyants & Singer, 2010). The construction of these sources initiated developments of new research areas, which utilize partial coherence of the X-ray radiation.…”

Section: Introductionmentioning

confidence: 99%

Coherence properties of focused X-ray beams at high-brilliance synchrotron sources

Singer

Vartanyants

2013

J Synchrotron Radiat

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An analytical approach describing properties of focused partially coherent X-ray beams is presented. The method is based on the results of statistical optics and gives both the beam size and transverse coherence length at any distance behind an optical element. In particular, here Gaussian Schell-model beams and thin optical elements are considered. Limiting cases of incoherent and fully coherent illumination of the focusing element are discussed. The effect of the beam-defining aperture, typically used in combination with focusing elements at synchrotron sources to improve transverse coherence, is also analyzed in detail.As an example, the coherence properties in the focal region of compound refractive lenses at the PETRA III synchrotron source are analyzed.

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“…An ultimate storage ring (USR) [1], defined as an electron ring-based light source having an emittance in both transverse planes at the diffraction limit for the range of x-ray wavelengths of interest for a scientific community, would provide very high brightness photons having high transverse coherence that would extend the capabilities of x-ray imaging and probe techniques beyond today's performance. It would be a cost-effective, high-coherence 4th generation light source [2], competitive with one based on energy recovery linac (ERL) technology [3], serving a large number of users studying material, chemical, and biological sciences.…”

Section: Introductionmentioning

confidence: 99%

Ultimate storage ring based on fourth-order geometric achromats

Cai

Bane

Hettel

et al. 2012

Phys. Rev. ST Accel. Beams

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We have designed an ''ultimate'' storage ring for a future light source that would be resided in the positron-electron-project (PEP) tunnel and achieves the diffraction-limited emittances (at 1.5 Å ) of 12 pm-rad in both horizontal and vertical planes with a 4.5-GeV electron beam. These emittances include the contribution of intrabeam scattering at a nominal current of 200 mA in 3300 bunches. This quality beam in conjunction with a conventional 4-m undulator in a straight section can generate synchrotron radiation having a spectral brightness above 10 22 ½photons=s=mm 2 =mrad 2 =0:1%BW at a 10 keV photon energy. The high coherence at the diffraction limit makes this design competitive with 4th generation light sources based on an energy recovery linac. In addition, the beam lifetime is several hours and the dynamic aperture is large enough to allow off-axis injection. The alignment and stability tolerances, though challenging, are achievable. A ring with all these properties is only possible because of several major advances in mitigating the effects of nonlinear resonances.

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The Potential of an Ultimate Storage Ring for Future Light Sources

Cited by 50 publications

References 23 publications

Perspectives for future light source lattices incorporating yet uncommon magnets

Perspectives for future light source lattices incorporating yet uncommon magnets

Coherence properties of focused X-ray beams at high-brilliance synchrotron sources

Ultimate storage ring based on fourth-order geometric achromats

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