Lattice design for angular dispersion enhanced microbunching in storage rings

Li, Changliang; Jiang, Bingyan; Feng, Chao; Huang, Dazhang; Zhang, Q.; Wang, K.

doi:10.1088/1748-0221/16/03/p03004

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…To expand the capabilities of the NSLS-II upgrade and a potential future DL-SLS in the PEP tunnel, we are considering a few FEL options using a lowemittance electron beam of the NSLS-II upgrade and SDLS and synergetic with SR operations. The cascaded EEHG seeding option has been numerically demonstrated with the capability of generating very narrow bandwidths and extremely high brightness, realized by diffraction-limited short pulses in transverse planes and Fourier-limited bandwidth in the tender to hard X-ray spectrum (Li et al, 2020(Li et al, , 2021Wang et al, 2019a,b;Zholents & Zolotorev, 2008;Xiang & Wan, 2010;Nuhn et al, 1992;Mitri & Cornacchia, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…To study the feasibility of the cascaded EEHG option for NSLS-II, its future upgrade and a recent proposed DL-SLS in PEP tunnel (named SDLS) (Raimondi et al, 2023;Yu et al, 2022;Wang et al, 2019;Li et al, 2021;APS, 2019;Borland, 2000), we have collected the crucial parameters determining the EEHG performance and show them in Table 1. R 1 (1-10 mm) for one BM section and (1-5 m) cover the complete parameter space.…”

Section: Critical Parameters Determining Eehg Beamlinementioning

confidence: 99%

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Toward a fully coherent tender and hard X-ray free-electron laser via cascaded EEHG in fourth-generation synchrotron light sources

Yang,

Yu,

Smaluk

et al. 2023

J Synchrotron Radiat

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Free-electron-laser-based beamlines utilize fully coherent laser pulses with extremely narrow bandwidth allowing direct use of X-rays without monochromators. This could be very beneficial for all users of current and future fourth-generation diffraction-limited synchrotron light sources (DL-SLSs) who need narrowband full-coherence high-brightness X-ray pulses. Based on our previous finding, i.e. that separating the two stages of echo-enabled harmonic generation (EEHG) with a few extra bending-magnet sections provides an effective way to increase the momentum compaction of chicane 1, one can simultaneously achieve adequate prebunching at extremely high harmonics as well as keep the energy modulation to the ideal minimum. This could open the door for cascaded EEHG, toward fully coherent tender and hard X-ray wavelengths. Built on our compact design of a twin-pulse seeding electron beam with an adjustable delay and timing jitter at the level of a few femtoseconds, a cascaded EEHG can be implemented, which includes two EEHG beamlines, where the radiation pulse generated by the first beamline with harmonic h 1 could be used as the input seed laser pulse to the second beamline with harmonic h 2. Hence, the second radiator could potentially reach very high harmonics [h = h 1(20)h 2(25–100)] from 500 to 2000, corresponding to tender and hard X-ray wavelengths. It is demonstrated that the cascaded EEHG scheme is compatible with almost any current or planned fourth-generation DL-SLS, with significant benefits for space-limited storage rings in particular. The main advantage is that this scheme requires almost no change of the storage-ring lattice and is fully compatible with other beamlines. Current proposals for rings with much longer straight sections would add self-amplified spontaneous emission as another viable option for storage-ring-based free-electron lasers.

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Section: Discussionmentioning

confidence: 99%

Section: Critical Parameters Determining Eehg Beamlinementioning

confidence: 99%

Toward a fully coherent tender and hard X-ray free-electron laser via cascaded EEHG in fourth-generation synchrotron light sources

Yang,

Yu,

Smaluk

et al. 2023

J Synchrotron Radiat

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show abstract

“…The EEHG seeding option has been demonstrated with the capability of generating very narrow bandwidths and extremely high brightness, realized by diffraction-limited short pulses in transverse planes and Fourier-limited bandwidth in the soft X-ray spectrum 1 , 34 – 39 . Regarding the 4th generation SLSs, momentum compactions are significantly smaller.…”

Section: Discussionmentioning

confidence: 99%

Twin-pulse seeding enables pump-probe capabilities in the EUV to soft X-ray spectrum at synchrotron light sources

Yang

Penn

et al. 2023

Sci Rep

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Having previously reported that separating the two stages of echo-enabled harmonic generation (EEHG) with one or more bending magnet (BM) sections allows the BMs to serve as the desired source of momentum compaction, here we demonstrate that this arrangement can greatly reduce the total energy modulation required by any 4th generation synchrotron light source, leading to higher repetition rates as well as stronger coherent radiation output power, with significant benefits. Since the EEHG beamline performance is mainly determined by the momentum compaction, beam emittances and beta functions of a storage ring lattice, allowing for different separations between the two stages is a straightforward way to increase the momentum compaction of chicane 1. This also enables pump-probe capabilities in a novel context, where twin-pulse seeding on the same electron bunch would allow two distinct radiation pulses with an adjustable delay in the range of 0.1 to 10 ps. In the twin-pulse seeding scheme, the same electron bunch could undergo modulation from two distinct laser pulses. Later stages would produce independent harmonics in subsequent straight sections. There are two variations of this twin-pulse seeding scheme, supporting different scientific applications. With a common modulation in stage 1, the first option allows simultaneously two independent radiation sources, with a full coverage of the EUV (2.5 to 50 nm) to soft X-ray (1.25 to 2.5 nm) spectrum; for the second option, the same stage 2 undulator could generate two coherent pulses both fitting within the FEL bandwidth, or at distinct harmonics. We present particle tracking simulation studies based on the APS-U lattice, including quantum excitation and radiation damping. These simulations indicate that there is no degradation of the modulated longitudinal phase space even when the two stages are separated by as many as 10 BM sections.

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“…However, a large vertical beta function in the proposed scheme is needed, with the result that beam lifetime will be shortened and the linear optics will be very sensitive to the field errors in a storage ring. Therefore, we propose to implement the proposed scheme in a bypass (Murphy & Pellegrini, 1985;Nuhn et al, 1992;Di Mitri & Cornacchia, 2015;Lee, 2019;Li et al, 2021), as shown in Fig. 1.…”

Section: Schematic Layoutmentioning

confidence: 99%

Generating coherent and ultrashort X-ray pulses via HHG-seeding in storage rings

Feng

et al. 2022

J Synchrotron Radiat

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The generation of fully coherent and femtosecond time-scale radiation pulses in the X-ray regime is one of the most common demands of ring-based synchrotron light source users. In this paper, a method that utilizes the recent proposed angular dispersion induced microbunching technique to convert external light from high-harmonic generation (HHG) to coherent light at shorter wavelength is proposed. Numerical simulations using the practical parameters of a diffraction-limited storage ring demonstrate the generation of coherent pulse trains with photon energy as high as 2 keV, pulse duration as short as ∼10 fs and high peak brightness directly from an HHG source at 13 nm.

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Lattice design for angular dispersion enhanced microbunching in storage rings

Cited by 9 publications

References 22 publications

Toward a fully coherent tender and hard X-ray free-electron laser via cascaded EEHG in fourth-generation synchrotron light sources

Toward a fully coherent tender and hard X-ray free-electron laser via cascaded EEHG in fourth-generation synchrotron light sources

Twin-pulse seeding enables pump-probe capabilities in the EUV to soft X-ray spectrum at synchrotron light sources

Generating coherent and ultrashort X-ray pulses via HHG-seeding in storage rings

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