MPY1

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2020-01-22
17:13
OpenAccess [PUBDB-2020-00498] Report/Journal Article
et al
Direct Observation of Plasma Waves and Dynamics induced by Laser-Accelerated Electron Beams
[arXiv:1810.11813]
Plasma wakefield acceleration (PWFA) is a novel acceleration technique with promising prospects for both particle colliders and light sources. However, PWFA research has so far been limited to a few large-scale accelerator facilities worldwide. [...]
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2020-01-13
13:20
[PUBDB-2020-00131] Journal Article
et al
Coherent Soft X-Ray pulses from an Echo-Enabled Harmonic Generation Free-Electron Laser
Nature photonics 13(8), 555 - 561 () [10.1038/s41566-019-0427-1]  GO
X-ray free-electron lasers (FELs), which amplify light emitted by a relativistic electron beam, are extending nonlinear optical techniquesto shorter wavelengths, adding element specificity by exciting and probing electronic transitions from core levels. Thesetechniques would benefit tremendously from having a stable FEL source, generating spectrally pure and wavelength-tunable pulses.We show that such requirements can be met by operating the FEL in the so-called echo-enabled harmonic generation (EEHG) configuration.Here, two external conventional lasers are used to precisely tailor the longitudinal phase space of the electron beambefore emission of X-rays. [...]
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2019-12-31
17:31
[PUBDB-2019-05694] Talk (non-conference)

The Future of External Seeding at FLASH
FUSEE -- FUture of SEeded free Electron lasers, DESYTrieste, DESY, Italy, 10 Dec 2019 - 11 Dec 20192019-12-102019-12-11
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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 2019, 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 2019, 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, FEL2019, 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, FEL2019, 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, FEL2019, 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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2019-12-22
00:06
[PUBDB-2019-05641] Journal Article/Contribution to a conference proceedings

Wake-T: A Fast Particle Tracking Code for Plasma-Based Accelerators
10th International Particle Accelerator Conference, IPAC 2019, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 Journal of physics / Conference series Conference series [...] 1350, 012056 - () [10.1088/1742-6596/1350/1/012056]  GO
The design and study of plasma-based accelerators relies typically on costly 3D Particle-In-Cell (PIC) simulations due to the complexity of the laser-plasma and beam-plasma interactions. However, under certain assumptions, more efficient and simple models can be implemented to describe the dynamics of the accelerated beams. [...]
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2019-12-20
15:28
[PUBDB-2019-05634] Conference Presentation

A Laser-Driven Plasma Accelerator with External Injection for EuPRAXIA
Plasma Physics by Lasers and Applications 2019, PPLA-2019, PisaPisa, Italy, 29 Oct 2019 - 31 Oct 20192019-10-292019-10-31
Laser-plasma acceleration on the GeV-level has been successfully demonstrated, however demanding applications such as free-electron-lasers raise the need for further improvements in beam quality, stability and reproducibility. One promising way to control accelerated beam quality in plasma-based accelerators is by means of external injection. [...]
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