FS-FLASH

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2020-01-23
11:30
[PUBDB-2020-00518] Journal Article
et al
Ghost imaging at an XUV free-electron laser
Here we present the results of a classical ghost imaging experiment accomplished at an XUV free-electronlaser (FEL). To perform such experiment at an FEL source each x-ray pulse was transmitted through a movingdiffuser, which created a noncorrelated speckled beam. [...]
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ddc:530
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2019-12-31
17:22
OpenAccess [PUBDB-2019-05693] Contribution to a conference proceedings
et al
Experimental Test of Longitudinal Space-Charge Amplifier in Optical Range
10th International Particle Accelerator Conference, IPAC'19, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 JACoW Publishing, Geneva, Switzerland 3267-3270 () [10.18429/JACOW-IPAC2019-WEPTS061]  GO
Longitudinal space-charge effects can act as a driver for short wavelength radiation production in a longitudinal space-charge amplifier (LSCA) *. A single cascade of an LSCA was tested using the hardware of the sFLASH experiment installed at the FEL user facility FLASH (at DESY, Hamburg). [...]
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2019-12-31
17:14
OpenAccess [PUBDB-2019-05692] Contribution to a conference proceedings
et al
Simulation Studies for a EEHG seeded FEL in the XUV
10th International Particle Accelerator Conference, IPAC'19, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 JACoW Publishing, Geneva, Switzerland 1705-1708 () [10.18429/JACOW-IPAC2019-TUPRB013]  GO
Echo-enabled harmonic generation (EEHG) is a promising technique for seeded free electron lasers (FELs) not only to go down to wavelengths of 4 nm, but also to simplify the schemes that are currently used to achieve a similar wavelength range (double cascade HGHG). Thus a study optimizing the EEHG performance in the wavelength range from 60 to §I{4}{nm} has been performed. [...]
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2019-12-31
16:58
OpenAccess [PUBDB-2019-05691] Contribution to a conference proceedings
et al
High-Repetition-Rate Seeding Schemes Using a Resonator-Amplifier Setup
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 222-225 () [10.18429/JACOW-FEL2019-TUP073]  GO
The spectral and temporal properties of Free-Electron Lasers (FEL) operating on the basis of self-amplified spontaneous emission (SASE) suffer from the stochastic behavior of the start-up process. Several so-called 'seeding'-techniques using external radiation fields to overcome this limitation have been proposed and demonstrated. [...]
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2019-12-31
16:49
OpenAccess [PUBDB-2019-05690] Contribution to a conference proceedings
et al
Impact of Electron Beam Energy Chirp on Seeded FELs
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 238-241 () [10.18429/JACOW-FEL2019-TUP078]  GO
Seeded FELs enable the generation of fully coherent, transform-limited and high brightness FEL pulses, as the start-up process is driven by an external coherent light pulse. During the design process of such FELs, it is important to choose carefully the electron beam parameters to guarantee high performance. [...]
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2019-12-31
16:44
OpenAccess [PUBDB-2019-05689] Contribution to a conference proceedings
et al
Study of a Seeded Oscillator-Amplifier FEL
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 234-237 () [10.18429/JACOW-FEL2019-TUP077]  GO
In recent years, there is interest of the Free-Electron Laser (FEL) community in external-seeding techniques such as the Echo-Enabled Harmonic Generation (EEHG) and the High-Gain Harmonic Generation (HGHG). With these techniques, pulses of an improved temporal coherence are generated, but at the same time, they are limited by the repetition rates that seed lasers can currently offer with the required pulse energies. [...]
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2019-12-16
15:09
[PUBDB-2019-05300] Contribution to a conference proceedings
et al
Two-Color Operation of FLASH2 Undulator
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 168-171 ()
FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. The second undulator branch of this facility, FLASH2, is gaptunable which allows to test and use advanced lasing concepts.In particular, we tested recently a two-color mode of operation based on the alternation of tunes of the undulator segments (every other segment is tuned to the second wavelength).This scheme is advantageous in comparison with a subsequent generation of two colors in two consecutive sections of the undulator line. [...]
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2019-12-12
14:42
OpenAccess [PUBDB-2019-05107] Contribution to a conference proceedings
et al
A Concept for Upgrade of FLASH2 Undulator Line
10th International Particle Accelerator Conference, IPAC'19, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 JACoW Publishing, Geneva, Switzerland 1736 - 1739 () [10.18429/JACOW-IPAC2019-TUPRB024]  GO
FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. There are plans to upgrade both existing undulator lines of this facility, FLASH1 and FLASH2. [...]
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2019-12-12
14:08
OpenAccess [PUBDB-2019-05101] Journal Article/Contribution to a conference proceedings/Contribution to a book
et al
Expected Radiation Properties of the Harmonic Afterburner at FLASH2
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 Journal of high energy physics () [10.18429/JACOW-FEL2019-WEP072]  GO
We discuss the afterburner option to upgrade the FLASH2 undulator line, at the FLASH facility in the Hamburg area, for delivering short wavelengths down to approximately 1.5 nm with variable polarization. This relatively straightforward upgrade enables us the study of the scientific cases in L- absorption edges of rare earth metals. [...]
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2019-12-12
13:49
OpenAccess [PUBDB-2019-05099] Contribution to a conference proceedings/Contribution to a book

Influence of Radiation Exposure on the FEL Performance at FLASH
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 488-491 () [10.18429/JACOW-FEL2019-WEP070]  GO
FLASH has been operated as user facility for about 14 years. In this time, the total charge accelerated and transported through the FLASH1 undulator is around 35 Coulomb. [...]
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