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11 May 2011 A new XUV-source for seeding a FEL at high repetition rates
Arik Willner, Michael Schulz, Robert Riedel, Mark Yeung, Thomas Dzelzainis, Christos Kamperidis, Makis Bakarezos, Darryl Adams, Vladislav Yakovlev, Juliane Rönsch-Schulenburg, Brendan Dromey, Nektarios Papadogiannis, Michael Tatarakis, Stefan Düsterer, Siegfried Schreiber, Bart Faatz, Markus Drescher, Jörg Rossbach, Matthew Zepf, Franz Tavella
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Proceedings Volume 8075, Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond II; 80750L (2011) https://doi.org/10.1117/12.888969
Event: SPIE Optics + Optoelectronics, 2011, Prague, Czech Republic
Abstract
Improved performance of Free Electron Laser (FEL) light sources in terms of timing stability, pulse shape and spectral properties of the amplified FEL pulses is of interest in many fields of science. A promising scheme is direct seeding with High-Harmonic Generation (HHG) in a noble gas target. A Free-Electron-Laser seeded by an external XUV-source is planned for FLASH II at DESY in Hamburg. The requirements for the XUV/soft X-ray source can be summarized as follows: A repetition rate of at least 100 kHz in a 10 Hz burst is needed at variable wavelengths from 10 to 40 nm and pulse energies of several nJ within single harmonics. This application requires a laser amplifier system with exceptional parameters, mJ-level pulse energy, sub-10 fs pulse duration at 100 kHz (1 MHz) burst repetition rate. A new OPCPA system is under development in order to meet these requirements, and very promising results has been achieved. In parallel to this development, a new High- Harmonic Generation concept is necessary to sustain the high average power of the driving laser system and for the need of high conversion efficiencies. Highest conversion efficiency in High Harmonic Generation has been shown using gas-filled capillary targets, up to now. For our application, only a free-jet target is applicable for high harmonic generation at high repetition rate, to overcome damage threshold limitations of HHG target optics. A new multi-jet target is under development and first tests show a good performance of this nozzle configuration.
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Arik Willner, Michael Schulz, Robert Riedel, Mark Yeung, Thomas Dzelzainis, Christos Kamperidis, Makis Bakarezos, Darryl Adams, Vladislav Yakovlev, Juliane Rönsch-Schulenburg, Brendan Dromey, Nektarios Papadogiannis, Michael Tatarakis, Stefan Düsterer, Siegfried Schreiber, Bart Faatz, Markus Drescher, Jörg Rossbach, Matthew Zepf, and Franz Tavella "A new XUV-source for seeding a FEL at high repetition rates", Proc. SPIE 8075, Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond II, 80750L (11 May 2011); https://doi.org/10.1117/12.888969
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KEYWORDS
Free electron lasers
Extreme ultraviolet
Laser systems engineering
Electron beams
Optical amplifiers
Fiber amplifiers
Diagnostics
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