Beam dynamics optimization of very-high-frequency gun photoinjector

Chen, Han; Zheng, Lianmin; Gao, Bin; Li, Zi-Zheng; Du, Yingchao; Li, Renkai; Huang, Wenhui; Tang, Chuanxiang; Gu, Duan; Zheng, Qiwen; Zhang, Meng; Deng, Haixiao; Gu, Qiang; Wang, Dong

doi:10.1007/s41365-022-01105-y

Cited by 11 publications

(3 citation statements)

References 32 publications

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“…The simplified schematic layout of the SHINE injector, consisting of a VHF gun [23,24] operating at 162.5 MHz, three solenoids, a 1.3-GHz 2-cell normal-conducting RF buncher for electron bunch compression, a 1.3-GHz SRF single-cavity cryomodule (injCM01) and a TESLA 1.3-GHz SRF 8-cavities cryomodule (injCM02), is shown in figure 1. The electron bunch are generated by the driving laser in the VHF Gun, which energy is 0.75 MeV at the exit of the gun.…”

Section: The Layout Of Shine Injector and Geometry Of Tesla Cavitymentioning

confidence: 99%

Coupler RF kick and emittance optimization of the SHINE injector

Guo,

Gu,

Jiang

et al. 2024

J. Inst.

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Coupler RF kick due to the asymmetric structure caused by the coupler, is more likely to lead to emittance growth in the SHINE injector with low beam energy. The calculation of coupler RF kick and resulting emittance dilution has been studied in detail in the literature. In this paper, a novel approach is provided that a lossy material is placed on the surface of the superconducting cavity to approximate the Q 0 of the TESLA cavity, and a frequency solver of CST is used to simulate the electromagnetic field distribution, which is used to calculate coupler RF kick, and calibrated against the results of CST Particle Tracking Studio with a good agreement. In order to minimize the emittance growth of SHINE injector, a 1.3 GHz symmetric twin-coupler cavity is adoped in the single-cavity cryomodule, and the rotational angle and permutation of the 8 cavities in the 8-cavities cryomodule is optimized. Ultimately, the optimized emittance is lower than the design parameter.

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Section: The Layout Of Shine Injector and Geometry Of Tesla Cavitymentioning

confidence: 99%

Coupler RF kick and emittance optimization of the SHINE injector

Guo,

Gu,

Jiang

et al. 2024

J. Inst.

Self Cite

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“…The SHINE accelerator comprises the following parts: a photo-injector, which generates electron beams with a repetition rate of up to 1 MHz and accelerates them to ∼100 MeV, and the main SCRF linear accelerator, where electron beams are accelerated to ∼8 GeV and are longitudinally compressed to a peak current of 1.5 kA. The photo-injector is based on a VHF photocathode gun [60,61]. The SHINE injector can produce a 10 ps full width at half maximum (FWHM) pulse with a 100 pC bunch charge, and a root mean square (RMS) normalized transverse emittance of 0.4 mm•mrad at 90-120 MeV.…”

Section: Shine Overviewmentioning

confidence: 99%

The MING proposal at SHINE: megahertz cavity enhanced X-ray generation

et al. 2023

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The cavity-based X-ray free-electron laser (XFEL) has promise in producing fully coherent pulses with a bandwidth of a few meV and very stable intensity, whereas the currently existing self-amplified spontaneous emission (SASE) XFEL is capable of generating ultra-short pulses with chaotic spectra. In general, a cavity-based XFEL can provide a spectral brightness three orders of magnitude higher than that of the SASE mode, thereby opening a new door for cutting-edge scientific research. With the development of superconducting MHz repetition-rate XFEL facilities such as FLASH, European-XFEL, LCLS-II, and SHINE, practical cavity-based XFEL operations are becoming increasingly achievable. In this study, megahertz cavity enhanced X-ray generation (MING) is proposed based on China’s first hard XFEL facility - SHINE, which we refer to as MING@SHINE.

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“…However, a larger population size also requires more computational resources and longer computation time. This method has been widely adopted in the field of accelerator during the last decades Bazarov and Sinclair [18]; Hajima and Nagai [19]; Hofler et al [20]; Papadopoulos et al [21]; Chen et al [22]; Zhu et al [23]; Neveu et al [24]. In this study, the population size of each generation is set to be 128, taking into account the decision variables of photoinjector optimization and the available computational resources.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed photoinjector optimization for high-repetition-rate free-electron lasers

et al. 2023

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The multiplexing capabilities of superconducting X-ray free-electron lasers (FELs) have gained much attention in recent years. The demanding requirements for photon properties from multiple undulator lines necessitate more flexible beam manipulation techniques to achieve the goal of “beam on demand”. In this paper, we investigate a multiplexed configuration for the photoinjector of high-repetition-rate FELs that aims to simultaneously provide low-emittance electron beams of different charges. A parallel, multi-objective genetic algorithm is implemented for the photoinjector parameter optimization. The proposed configuration could drastically enhance the flexibility of beam manipulation to improve multiplexing capabilities and realize the full potential of the facility.

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Beam dynamics optimization of very-high-frequency gun photoinjector

Cited by 11 publications

References 32 publications

Coupler RF kick and emittance optimization of the SHINE injector

Coupler RF kick and emittance optimization of the SHINE injector

The MING proposal at SHINE: megahertz cavity enhanced X-ray generation

Multiplexed photoinjector optimization for high-repetition-rate free-electron lasers

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