| Paper | Title | Page |
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| MOP013 | Hundred-Gigawatt X-Ray Self-Seeded High-Gain Harmonic Generation | 53 |
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| Self-seeded high-gain harmonic generation is a possible way to extend the wavelength of a soft x-ray free-electron laser (FEL). We have carried out simulation study on harmonic generation within the photon energy range from 2 keV to 4.5 keV, which is difficult to achieve due to a lack of monochromator materials. In this work, we demonstrate the third harmonic FEL with the fundamental wavelength at 1.52 nm. Our results shows that, by using undulator tapering technique, sub-terawatt narrow-bandwidth FEL output can be obtained. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP013 | |
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| MOP014 | Harmonic Lasing Towards Shorter Wavelengths in Soft X-Ray Self-Seeding FELs | 57 |
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| In this paper, we study a simple harmonic lasing scheme to extend the wavelength of X-ray self-seeding FELs. The self-seeding amplifier is comprised of two stages. In the first stage, the fundamental radiation is amplified but well restricted below saturation, and simultaneously harmonic radiation is generated. In the second stage, the fundamental radiation is suppressed while the harmonic radiation is amplified to saturation. We performed a start-to-end simulation to demonstrate third harmonic lasing in a soft x-ray self-seeding FEL at the fundamental wavelength of 1.52 nm. Our simulations show that a stable narrow-band FEL at GW levels can be obtained. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP014 | |
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| TUC05 | Start-to-End Simulations for an X-Ray FEL Oscillator at the LCLS-II and LCLS-II-HE | 247 |
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| The proposed high repetition-rate electron beam from the LCLS-II and LCLS-II High Energy (LCLS-II-HE) upgrade are promising sources as drivers for an X-ray FEL Oscillator (XFELO) operating at both the harmonic and fundamental frequencies. In this contribution we present start-to-end simulations for an XFELO operating at the fifth harmonic with 4 GeV LCLS-II beam and at the fundamental with 8 GeV LCLS-II-HE beam. The electron beam longitudinal phase space is optimized by shaping the photoinjector laser and adjusting various machine parameters. The XFELO simulations show that high-flux output radiation pulses with 1010 photons and 3 meV (FWHM) spectral bandwidth can be obtained with the 8 GeV configuration. | ||
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Slides TUC05 [3.802 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-TUC05 | |
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WEA03 |
Simulation Optimization of DC-SRF Photoinjector for Low-Emittance Electron Beam Generation | |
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| A DC and superconducting rf (SRF) combined photoinjector, DC-SRF photoinjector, has been developed at Peking University to generate high repetition-rate electron bunches. At present stable operation of the DC-SRF photoinjector has been realized and the electron beam has been delivered to a SRF linac with two 9-cell TESLA-type cavities for further acceleration and experiments. Here we will present our latest progress on the DC-SRF photoinjector. We will also present our recent simulation work to decrease the emittance. The purpose is to build an upgraded DC-SRF photoinjector capable of driving CW X-ray free-electron lasers. | ||
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Slides WEA03 [6.287 MB] | |
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