Temporal X-ray Reconstruction using Temporal and Spectral Measurements at LCLS
Transverse deflecting structures (TDSs) are widely used in accelerator physics to measure the longitudinal density of particle bunches. When used in combination with a dispersive section, the whole longitudinal phase space density can be imaged. At the Linac Coherent Light Source (LCLS), the install...
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| Veröffentlicht in: | Scientific reports 2020-06, Vol.10 (1), p.9799-9799, Article 9799 |
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| creator | Christie, Florian Lutman, Alberto Andrea Ding, Yuantao Huang, Zhirong Jhalani, Vatsal A. Krzywinski, Jacek Maxwell, Timothy J. Ratner, Daniel Rönsch-Schulenburg, Juliane Vogt, Mathias |
| description | Transverse deflecting structures (TDSs) are widely used in accelerator physics to measure the longitudinal density of particle bunches. When used in combination with a dispersive section, the whole longitudinal phase space density can be imaged. At the Linac Coherent Light Source (LCLS), the installation of such a device downstream of the undulators enables the reconstruction of the X-ray temporal intensity profile by comparing longitudinal phase space distributions with lasing on and lasing off. However, the resolution of this TDS is limited to around 1 fs rms (root mean square), and therefore, it is not possible to resolve single self-amplified spontaneous emission (SASE) spikes within an X-ray photon pulse. By combining the power spectrum from a high resolution photon spectrometer and the temporal structure from the TDS, the overall resolution is enhanced, thus allowing the observation of temporal, single SASE spikes. The combined data from the spectrometer and the TDS is analysed using an iterative algorithm to obtain the actual intensity profile. In this paper, we present some improvements to the reconstruction algorithm as well as real data taken at LCLS. |
| doi_str_mv | 10.1038/s41598-020-66220-5 |
| format | Article |
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When used in combination with a dispersive section, the whole longitudinal phase space density can be imaged. At the Linac Coherent Light Source (LCLS), the installation of such a device downstream of the undulators enables the reconstruction of the X-ray temporal intensity profile by comparing longitudinal phase space distributions with lasing on and lasing off. However, the resolution of this TDS is limited to around 1 fs rms (root mean square), and therefore, it is not possible to resolve single self-amplified spontaneous emission (SASE) spikes within an X-ray photon pulse. By combining the power spectrum from a high resolution photon spectrometer and the temporal structure from the TDS, the overall resolution is enhanced, thus allowing the observation of temporal, single SASE spikes. The combined data from the spectrometer and the TDS is analysed using an iterative algorithm to obtain the actual intensity profile. In this paper, we present some improvements to the reconstruction algorithm as well as real data taken at LCLS.</description><identifier>ISSN: 2045-2322</identifier><identifier>EISSN: 2045-2322</identifier><identifier>DOI: 10.1038/s41598-020-66220-5</identifier><identifier>PMID: 32555209</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>639/624/1020/1087 ; 639/766/400/1106 ; 639/766/400/584 ; Algorithms ; Free-electron lasers ; Humanities and Social Sciences ; Light sources ; multidisciplinary ; OTHER INSTRUMENTATION ; Radiation ; Science ; Science (multidisciplinary) ; ultrafast photonics ; X-rays</subject><ispartof>Scientific reports, 2020-06, Vol.10 (1), p.9799-9799, Article 9799</ispartof><rights>The Author(s) 2020</rights><rights>The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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| subjects | 639/624/1020/1087 639/766/400/1106 639/766/400/584 Algorithms Free-electron lasers Humanities and Social Sciences Light sources multidisciplinary OTHER INSTRUMENTATION Radiation Science Science (multidisciplinary) ultrafast photonics X-rays |
| title | Temporal X-ray Reconstruction using Temporal and Spectral Measurements at LCLS |
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