Mitigation of CSR induced spectral broadening in EEHG FEL
(2023) In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1048.- Abstract
Externally seeded schemes have offered a major leap in improving the longitudinal coherence of FELs in the EUV and soft X-ray range. The Echo Enabled Harmonic Generation (EEHG) technique creates bunching at wavelengths of a few nanometers in two stages of longitudinal phase space manipulation, each consisting of an energy modulator and a chicane. Compared to other seeding techniques, EEHG is less sensitive to electron beam phase space distortions occurring during acceleration and compression. However the strong chicane needed in the first stage makes the system vulnerable to Coherent Synchrotron Radiation (CSR), which imprints a long-wavelength energy modulation on the electron bunch after the EEHG process has been initiated. Coupled... (More)
Externally seeded schemes have offered a major leap in improving the longitudinal coherence of FELs in the EUV and soft X-ray range. The Echo Enabled Harmonic Generation (EEHG) technique creates bunching at wavelengths of a few nanometers in two stages of longitudinal phase space manipulation, each consisting of an energy modulator and a chicane. Compared to other seeding techniques, EEHG is less sensitive to electron beam phase space distortions occurring during acceleration and compression. However the strong chicane needed in the first stage makes the system vulnerable to Coherent Synchrotron Radiation (CSR), which imprints a long-wavelength energy modulation on the electron bunch after the EEHG process has been initiated. Coupled with the second dispersive section, this modulation creates a position dependent change in the final bunching wavelength. In this work we show that tailoring the second seed laser wavelength can successfully compensate for the varying energy profile induced by CSR.
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- author
- Pop, Mihai LU ; Curbis, Francesca LU ; Werin, Sverker LU and Allaria, Enrico
- organization
- publishing date
- 2023-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- CSR, EEHG, FEL, Laser tailoring, Optimization
- in
- Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- volume
- 1048
- article number
- 167926
- pages
- 8 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85144551092
- ISSN
- 0168-9002
- DOI
- 10.1016/j.nima.2022.167926
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2022 The Author(s)
- id
- 0d891ded-196c-4dd4-a9d3-83538d701e4b
- date added to LUP
- 2023-01-04 10:22:33
- date last changed
- 2023-10-12 14:47:42
@article{0d891ded-196c-4dd4-a9d3-83538d701e4b, abstract = {{<p>Externally seeded schemes have offered a major leap in improving the longitudinal coherence of FELs in the EUV and soft X-ray range. The Echo Enabled Harmonic Generation (EEHG) technique creates bunching at wavelengths of a few nanometers in two stages of longitudinal phase space manipulation, each consisting of an energy modulator and a chicane. Compared to other seeding techniques, EEHG is less sensitive to electron beam phase space distortions occurring during acceleration and compression. However the strong chicane needed in the first stage makes the system vulnerable to Coherent Synchrotron Radiation (CSR), which imprints a long-wavelength energy modulation on the electron bunch after the EEHG process has been initiated. Coupled with the second dispersive section, this modulation creates a position dependent change in the final bunching wavelength. In this work we show that tailoring the second seed laser wavelength can successfully compensate for the varying energy profile induced by CSR.</p>}}, author = {{Pop, Mihai and Curbis, Francesca and Werin, Sverker and Allaria, Enrico}}, issn = {{0168-9002}}, keywords = {{CSR; EEHG; FEL; Laser tailoring; Optimization}}, language = {{eng}}, publisher = {{Elsevier}}, series = {{Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}}, title = {{Mitigation of CSR induced spectral broadening in EEHG FEL}}, url = {{http://dx.doi.org/10.1016/j.nima.2022.167926}}, doi = {{10.1016/j.nima.2022.167926}}, volume = {{1048}}, year = {{2023}}, }