Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams
The intrinsic energy spread of electron beams needs to be measured to characterize and optimize high-brightness electron beam sources such as those driving x-ray free-electron lasers (FELs). We demonstrate the use of the optical klystron effect as a precise and high-resolution method to measure the...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2024-03-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.27.030701 |
| _version_ | 1797289224968339456 |
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| author | Eduard Prat Christoph Kittel Marco Calvi Paolo Craievich Philipp Dijkstal Sven Reiche Thomas Schietinger Guanglei Wang |
| author_facet | Eduard Prat Christoph Kittel Marco Calvi Paolo Craievich Philipp Dijkstal Sven Reiche Thomas Schietinger Guanglei Wang |
| author_sort | Eduard Prat |
| collection | DOAJ |
| description | The intrinsic energy spread of electron beams needs to be measured to characterize and optimize high-brightness electron beam sources such as those driving x-ray free-electron lasers (FELs). We demonstrate the use of the optical klystron effect as a precise and high-resolution method to measure the electron beam energy spread. The optical klystron setup consists of undulator modules and magnetic chicanes placed between them. The energy spread is found by measuring the radiation power produced in the undulators as a function of the chicanes’ strengths. High resolution and simplicity are the advantages of this approach, in contrast to the standard method, which measures the longitudinal phase space of the electron beam with a transverse deflector. The demonstration was performed at Athos, the soft x-ray FEL beamline of SwissFEL, for which we measured energy spreads below 1 MeV at a central beam energy of 3.4 GeV. We have verified the consistency of the method for different parameters (radiation wavelengths, undulator polarization configurations, and electron bunch durations) and we have benchmarked it against the standard measurement approach using a transverse deflector. Our results confirm the optical klystron as a valid approach to measure the electron beam energy spread. The method can be especially useful to reconstruct low energy spread values, where the conventional approach may be resolution limited, such as in ultra high-brightness radiofrequency photoinjectors or plasma sources, or when transverse deflectors are not available. |
| first_indexed | 2024-03-07T19:00:39Z |
| format | Article |
| id | doaj.art-f1854a91417d4e17b11a25c929d31edd |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-03-07T19:00:39Z |
| publishDate | 2024-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-f1854a91417d4e17b11a25c929d31edd2024-03-01T15:36:06ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882024-03-0127303070110.1103/PhysRevAccelBeams.27.030701Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beamsEduard PratChristoph KittelMarco CalviPaolo CraievichPhilipp DijkstalSven ReicheThomas SchietingerGuanglei WangThe intrinsic energy spread of electron beams needs to be measured to characterize and optimize high-brightness electron beam sources such as those driving x-ray free-electron lasers (FELs). We demonstrate the use of the optical klystron effect as a precise and high-resolution method to measure the electron beam energy spread. The optical klystron setup consists of undulator modules and magnetic chicanes placed between them. The energy spread is found by measuring the radiation power produced in the undulators as a function of the chicanes’ strengths. High resolution and simplicity are the advantages of this approach, in contrast to the standard method, which measures the longitudinal phase space of the electron beam with a transverse deflector. The demonstration was performed at Athos, the soft x-ray FEL beamline of SwissFEL, for which we measured energy spreads below 1 MeV at a central beam energy of 3.4 GeV. We have verified the consistency of the method for different parameters (radiation wavelengths, undulator polarization configurations, and electron bunch durations) and we have benchmarked it against the standard measurement approach using a transverse deflector. Our results confirm the optical klystron as a valid approach to measure the electron beam energy spread. The method can be especially useful to reconstruct low energy spread values, where the conventional approach may be resolution limited, such as in ultra high-brightness radiofrequency photoinjectors or plasma sources, or when transverse deflectors are not available.http://doi.org/10.1103/PhysRevAccelBeams.27.030701 |
| spellingShingle | Eduard Prat Christoph Kittel Marco Calvi Paolo Craievich Philipp Dijkstal Sven Reiche Thomas Schietinger Guanglei Wang Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams Physical Review Accelerators and Beams |
| title | Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams |
| title_full | Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams |
| title_fullStr | Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams |
| title_full_unstemmed | Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams |
| title_short | Experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high-brightness electron beams |
| title_sort | experimental characterization of the optical klystron effect to measure the intrinsic energy spread of high brightness electron beams |
| url | http://doi.org/10.1103/PhysRevAccelBeams.27.030701 |
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