Widening and distortion of the particle energy distribution by chromaticity in quasi-isochronous rings

Deng, Xiujie; Klein, R.; Chao, Alexander W.; Hoehl, Arne; Huang, Wenhui; Li, J.; Lübeck, J.; Petenev, Yuriy; Ries, Markus; Seiler, Inés; Tang, Chuanxiang; Feikes, J.

doi:10.1103/physrevaccelbeams.23.044001

Cited by 13 publications

(2 citation statements)

References 13 publications

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“…Theoretical studies on the dynamics of SSMB have been extensive, as well as experimental investigations of several fundamental concepts relevant for SSMB 31,[33][34][35][36][37] . Some theoretical considerations are introduced in the following that provide the basis for the systematic investigations of microbunching dynamics as presented in this paper.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

Confirming the theoretical foundation of steady-state microbunching

Kruschinski,

Deng,

Feikes

et al. 2024

Commun Phys

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Steady-State Microbunching (SSMB) has been proposed as a concept to generate coherent synchrotron radiation at an electron storage ring. SSMB promises to supply kilowatt level average power radiation in the extreme ultraviolet regime, meeting the power level demands for lithography applications that presently cannot be fulfilled by established accelerator technologies. SSMB is under theoretical and experimental study, building on a proof-of-principle (PoP) experiment at the Metrology Light Source which previously showed the viability of the idea. Here we report experimental findings from systematic studies in the ongoing SSMB PoP experiment, where microbunching is generated from an energy modulation imposed by a laser of wavelength 1064 nm. The results confirm the expected dependence of the microbunching process on modulation amplitude and show that the influence of transverse-longitudinal coupling dynamics is as predicted. This confirmation of key parts of the SSMB theory establishes a solid footing for continuing the proof-of-principle efforts towards the goal of constructing a prototype SSMB light source facility.

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Section: Theoretical Considerationsmentioning

confidence: 99%

Confirming the theoretical foundation of steady-state microbunching

Kruschinski,

Deng,

Feikes

et al. 2024

Commun Phys

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“…The theoretical formulation of microbunching instability has been developed, for example, in single-pass linac-based FEL facilities [11][12][13][14][15][16][17][18], the RF-based storage ring light sources [19][20][21][22][23] and the ERL-based light sources or recirculating electron cooling facilities [24][25][26][27][28]. As for the SSMB-based storage ring light sources, the single-particle dynamics has been recently investigated in detail [6,29] and the proof-of-principle experiment has been conducted to demonstrate that the microbunching is achievable after one complete revolution of an electron bunch modulated by an external laser in a dedicated storage ring [7]. However the collective effects in the SSMB storage ring were not examined in detail.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal single-bunch instabilities driven by coherent undulator radiation in the cavity modulator of a steady-state microbunching storage ring

Tsai

2022

Preprint

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Recently a mechanism of storage ring operation based on the steady-state microbunching has been proposed and investigated, which contains a laser cavity modulator providing the longitudinal focusing for the circulating microbunches. In this paper we analyze the impact of the coherent undulator radiation on the longitudinal single-bunch multi-turn collective dynamics, exploring a new possible instability mechanism. We formulate the multi-turn equations of motion for the single microbunch as two sets of difference equations in the modulator and in the remaining storage ring. The dispersion equation can then be obtained by introduction of the undulator-averaged phase space coordinates. The predicted instability growth rate shows reasonable agreement with the numerical turn-by-turn tracking simulations provided validity of the underlying assumptions. The analysis shall provide some insights for the coherent undulator radiation driven multi-turn instability in the cavity modulator. Differences between such a new instability mechanism and the Robinson instability in a conventional radio-frequency-based storage ring are also discussed.

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SSMB Transverse-Longitudinal Coupling Dynamics

Deng

2023

Springer Theses

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After dedicated efforts devoted to the longitudinal dynamics to realize an ultrasmall longitudinal emittance and ultrashort bunch length for coherent radiation generation, we need to make sure that the coupling arising from transverse dynamics does not degrade or even destroy the longitudinal fine structures. Such an argument is based on the observation that the transverse beam size in an SSMB ring can be orders of magnitude larger than the desired microbunch length. This is the basic motivation for us to investigate the transverse-longitudinal coupling (TLC) dynamics. In this chapter, we start from the linear TLC and then investigate the nonlinear TLC dynamics. For the linear dynamics, first we analyze the passive bunch lengthening induced by bending magnets. We then emphasize the fact that TLC can actually be actively applied for efficient bunch compression and high harmonic generation when the transverse emittance is small. We present three theorems on the application of such TLC schemes, with their implications discussed. Further, we have analyzed the contribution of modulators to the vertical emittance from quantum excitation, to obtain a self-consistent evaluation of the required modulation laser power when applying these coupling schemes in a storage ring. The theorems and related analysis provide the theoretical basis for the application of TLC in SSMB to lower the requirement on the modulation laser power, by taking advantage of the fact that the vertical emittance in a planar ring is rather small. Based on the investigations, we have presented example parameters sets for the envisioned SSMB storage ring to generate high-power EUV and soft X-ray radiation at the end of this dissertation.

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Widening and distortion of the particle energy distribution by chromaticity in quasi-isochronous rings

Cited by 13 publications

References 13 publications

Confirming the theoretical foundation of steady-state microbunching

Confirming the theoretical foundation of steady-state microbunching

Longitudinal single-bunch instabilities driven by coherent undulator radiation in the cavity modulator of a steady-state microbunching storage ring

SSMB Transverse-Longitudinal Coupling Dynamics

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