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XFEL Operational Flexibility due to the Dechirper System |
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- A.A. Lutman, K.L.F. Bane, Y. Ding, C. Emma, M.W. Guetg, E. Hemsing, Z. Huang, J. Krzywiński, J.P. MacArthur, G. Marcus, A. Marinelli, T.J. Maxwell, A. Novokhatski
SLAC, Menlo Park, California, USA
- G. Guo
Stanford University, Stanford, California, USA
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Funding: U.S.Department of Energy, Office of Science, Laboratory Directed Research and Development (LDRD) program at SLAC National Accelerator Laboratory, under Contract No. DE-AC02-76SF00515.
The RadiaBeam/SLAC dechirper was installed to demonstrate the concept of using wakefields from a corrugated structure to change the energy profile along an electron bunch. Since installation, the system has allowed a large number of additional XFEL operating modes including fresh-slice two-color or three color operation, fresh-slice seeding, passive streaking, etc. This talk will discuss the results from using the dechirper system and possible implementation issues related to the high-rate LCLS-II.
Lutman, A. A. et al. Nat. Photon. 10, 745-750 (2016).; Nat. Photon. 10, 695-696 (2016); other papers in submission.
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Slides WEXPLM1 [5.744 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2019-WEXPLM1
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| About • |
paper received ※ 10 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019 |
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THAPLM5 |
The Mark Oliphant Prize |
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- J.P. MacArthur
SLAC, Menlo Park, California, USA
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The Mark Oliphant Prize for a student registered for a Ph.D. or diploma in accelerator physics or engineering, or to a trainee accelerator physicist or engineer in the educational phase of his or her professional career will be based on nominated presentations at the student poster session at IPAC’19.
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Slides THAPLM5 [5.725 MB]
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TUZPLS1 |
Microbunch Rotation and Coherent Undulator Radiation From a Kicked Electron Beam |
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- J.P. MacArthur
Stanford University, Stanford, California, USA
- Z. Huang, J. Krzywiński, A.A. Lutman
SLAC, Menlo Park, California, USA
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Most X-ray Free Electron Lasers (FELs) emit linearly polarized X-ray pulses. Recently, a device called the Delta undulator has been installed at the Linac Coherent Light Source (LCLS) to provide tuneable polarization. The electron beam is first microbunched by the LCLS normal undulators, then the microbunched beam is kicked prior to the Delta undulator, and an intense circularly polarized X-ray pulse is generated in the Delta undulator towards the kicked direction and is spatially separation from the linearly polarized radiation from upstream undulators. Coherent off-axis radiation is usually strongly suppressed because the microbunches themselves cannot rotate. The talk will show that microbunches can in fact rotate towards the new direction of travel if the kick is applied in a quadrupole focusing channel and also will clarify characteristics of the coherent undulator radiation from a tilted microbunch in the far-field and will compare simulations with experiments. This microbunch rotation can explain the unexpectedly large amount of off-axis radiation that was observed during Delta undulator experiments at LCLS and may have other applications to the advanced X-ray manipulations.
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Slides TUZPLS1 [14.027 MB]
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