Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper
The pulse duration in short-pulse schemes for Self-Amplified Spontaneous Emission Free Electron Lasers (SASE FELs) is limited by the FEL coherence time. A recently proposed concept allows to overcome the coherence time barrier and to obtain much shorter pulses. When the lasing part of an electron bu...
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| Format: | Article |
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MDPI AG
2023-06-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/6/653 |
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| author | Evgeny Schneidmiller Matthias Dreimann Marion Kuhlmann Juliane Rönsch-Schulenburg Helmut Zacharias |
| author_facet | Evgeny Schneidmiller Matthias Dreimann Marion Kuhlmann Juliane Rönsch-Schulenburg Helmut Zacharias |
| author_sort | Evgeny Schneidmiller |
| collection | DOAJ |
| description | The pulse duration in short-pulse schemes for Self-Amplified Spontaneous Emission Free Electron Lasers (SASE FELs) is limited by the FEL coherence time. A recently proposed concept allows to overcome the coherence time barrier and to obtain much shorter pulses. When the lasing part of an electron bunch is much shorter than the coherence time, one can suppress the radiation in the long main undulator while preserving microbunching within that short lasing slice. Then, a short radiation pulse is produced in a relatively short radiator. A possible suppression method, an excessive reverse undulator taper, is discussed and illustrated numerically in this paper. We also performed the first experimental tests of this method at the soft X-ray FEL user facility FLASH. The measured pulse duration approaches 1 fs (FWHM) at the wavelength of 5 nm. |
| first_indexed | 2024-03-11T02:02:05Z |
| format | Article |
| id | doaj.art-7b803804216843e7b2c305ce01389b9a |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-11T02:02:05Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
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| series | Photonics |
| spelling | doaj.art-7b803804216843e7b2c305ce01389b9a2023-11-18T12:07:51ZengMDPI AGPhotonics2304-67322023-06-0110665310.3390/photonics10060653Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator TaperEvgeny Schneidmiller0Matthias Dreimann1Marion Kuhlmann2Juliane Rönsch-Schulenburg3Helmut Zacharias4Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, GermanyCenter for Soft Nanoscience, Westfälische Wilhelms-Universität, 48149 Münster, GermanyDeutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, GermanyDeutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, GermanyCenter for Soft Nanoscience, Westfälische Wilhelms-Universität, 48149 Münster, GermanyThe pulse duration in short-pulse schemes for Self-Amplified Spontaneous Emission Free Electron Lasers (SASE FELs) is limited by the FEL coherence time. A recently proposed concept allows to overcome the coherence time barrier and to obtain much shorter pulses. When the lasing part of an electron bunch is much shorter than the coherence time, one can suppress the radiation in the long main undulator while preserving microbunching within that short lasing slice. Then, a short radiation pulse is produced in a relatively short radiator. A possible suppression method, an excessive reverse undulator taper, is discussed and illustrated numerically in this paper. We also performed the first experimental tests of this method at the soft X-ray FEL user facility FLASH. The measured pulse duration approaches 1 fs (FWHM) at the wavelength of 5 nm.https://www.mdpi.com/2304-6732/10/6/653Free Electron LaserSASE FELX-ray FELultrashort pulses |
| spellingShingle | Evgeny Schneidmiller Matthias Dreimann Marion Kuhlmann Juliane Rönsch-Schulenburg Helmut Zacharias Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper Photonics Free Electron Laser SASE FEL X-ray FEL ultrashort pulses |
| title | Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper |
| title_full | Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper |
| title_fullStr | Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper |
| title_full_unstemmed | Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper |
| title_short | Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper |
| title_sort | generation of ultrashort pulses in xuv and x ray fels via an excessive reverse undulator taper |
| topic | Free Electron Laser SASE FEL X-ray FEL ultrashort pulses |
| url | https://www.mdpi.com/2304-6732/10/6/653 |
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