SLAC, Menlo Park, California, USA
[1] C. Behrens et al., ’Few-femtosecond time-resolved measurements of X-ray free-electron lasers’ Nat. Commun., vol. 5, no. 1, pp. 17, Apr. 2014, doi: 10.1038/ncomms4762.
SLAC, Menlo Park, California, USA
| Paper | Title | Page |
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| WEPP18 | New X-Band RF Deflector for Femtosecond Diagnostics of LCLS-II Beams | 412 |
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An X-band transverse deflector has been successfully developed for femtosecond electron and x-ray pulse temporal diagnostic at the LCLS [1]. The working frequency for the deflector is 11.424 GHz. New free electron laser LCLS-II has two undulator beamlines, one Soft-X-Ray and another Hard-X-Ray. The Hard-X-Ray line uses two one-meter long X-band deflectors for beam diagnostics. We have designed, build, installed and commissioned another, 1.5 meter long X-band deflector in the Soft-X-Ray beam line. Both Hard-X-Ray and Soft-X-Ray deflectors share one klystron. RF power is transmitted from a 50 MW klystron to a tunnel in an overmoded circular waveguide and then directed to either of the deflectors using a remotely controlled RF switch. The power split ratio could be changed arbitrarily, and both deflectors could work simultaneously. In this article, we provide details on the development and commissioning of the new deflector.
[1] C. Behrens et al., ’Few-femtosecond time-resolved measurements of X-ray free-electron lasers’ Nat. Commun., vol. 5, no. 1, pp. 17, Apr. 2014, doi: 10.1038/ncomms4762. |
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Poster WEPP18 [3.812 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-WEPP18 | |
| About • | paper received ※ 11 September 2021 paper accepted ※ 27 September 2021 issue date ※ 10 October 2021 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| WEPP20 | Design of the Bunch-Length Monitors for the New Superconducting LCLS Linac | 422 |
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| The LCLS x-ray free-electron laser at SLAC uses the third km of the original 3-km copper linac. We are now installing LCLS-II, a superconducting linac that replaces the first km. Two undulators, for hard and soft x rays, will be driven by bunches from either linac. One of the solutions developed at SLAC involves a pyroelectric detector, which converts the infrared emitted by the electron bunch into voltage by measuring fast changes in the temperature of the detecting crystal. Not only are the pyrodetectors used at SLAC but also a method with gap diodes. The radial electric field produced by the bunches leaks through a ceramic gap in the beampipe and is collected by a horn antenna and conveyed through a one millimeter waveguide. The waveguides act as a filter, only passing shorter wavelengths and a zero-bias Schottky diode measures the power. In both methods, a portion of the spectral energy emitted by the bunch is intercepted. After normalizing to differentiate between bunches of the same length with different charge, the detected signal is sensitive to only changes in bunch length. This poster discusses the mechanics and optics behind the LCLS-II bunch length monitors operations and plans for collaboration. | ||
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Poster WEPP20 [1.693 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2021-WEPP20 | |
| About • | paper received ※ 09 September 2021 paper accepted ※ 28 September 2021 issue date ※ 18 October 2021 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |