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| Title | Measurement and Correction of RF Kicks in the LCLS Accelerator to Improve Two-Bunch Operation | |
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| Abstract | RF kicks, caused by a misalignment of an electron beam and acceleration structure, produce an electron orbit in the accelerator which decreases the final energy of the accelerated electron beam and is detrimental to lasing electron bunches in an X-ray Free Electron Laser (XFEL). RF kicks can depend on the RF waveform of the accelerating structure, so controlling this effect is particularly important when two or more electron bunches are accelerated within an RF fill time. Multibunch modes have been successfully developed for the Linac Coherent Light Source (LCLS) accelerator at SLAC,* and are being continually improved to accommodate new experiments. One such experiment, the Cavity-Based XFEL (CBXFEL)** project will require two electron bunches separated by 218.5 ns which must be identical in energy and orbit. To reduce variation in energy and orbit between the two bunches, we studied the RF kicks produced by each of 75 accelerator segments in the LCLS linac at several RF timings. Here, we discuss these measurements and propose a method to correct RF kicks in the LCLS accelerator using corrector dipoles and quadrupoles. | |
| Footnotes & References | * F.-J. Decker, et al. Recent Developments and Plans for Two Bunch Operation, Proc. of FEL2017, TUP023. ** Gabriel Marcus et al. CBXFEL Physics Requirements Document. SLAC-I-120-103-121-00. 2020. |
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| Funding | This work was supported by the Department of Energy, Laboratory Directed Research and Development program at SLAC National Accelerator Laboratory, under contract DE-AC02-76SF00515. | |
| Paper | download TUPAB110.PDF [2.015 MB / 3 pages] | |
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |
| Conference | IPAC2021 | |
| Series | International Particle Accelerator Conference (12th) | |
| Location | Campinas, SP, Brazil | |
| Date | 24-28 May 2021 | |
| Publisher | JACoW Publishing, Geneva, Switzerland | |
| Editorial Board | Liu Lin (LNLS, Campinas, Brazil); John M. Byrd (ANL, Lemont, IL, USA); Regis Neuenschwander (LNLS, Campinas, Brazil); Renan Picoreti (LNLS, Campinas, Brazil); Volker R. W. Schaa (GSI, Darmstadt, Germany) | |
| Online ISBN | 978-3-95450-214-1 | |
| Online ISSN | 2673-5490 | |
| Received | 19 May 2021 | |
| Accepted | 15 June 2021 | |
| Issue Date | 29 August 2021 | |
| DOI | doi:10.18429/JACoW-IPAC2021-TUPAB110 | |
| Pages | 1644-1646 | |
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