11 May 2011 A new XUV-source for seeding a FEL at high repetition rates
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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, Arik Willner, Michael Schulz, Michael Schulz, Robert Riedel, Robert Riedel, Mark Yeung, Mark Yeung, Thomas Dzelzainis, Thomas Dzelzainis, Christos Kamperidis, Christos Kamperidis, Makis Bakarezos, Makis Bakarezos, Darryl Adams, Darryl Adams, Vladislav Yakovlev, Vladislav Yakovlev, Juliane Rönsch-Schulenburg, Juliane Rönsch-Schulenburg, Brendan Dromey, Brendan Dromey, Nektarios Papadogiannis, Nektarios Papadogiannis, Michael Tatarakis, Michael Tatarakis, Stefan Düsterer, Stefan Düsterer, Siegfried Schreiber, Siegfried Schreiber, Bart Faatz, Bart Faatz, Markus Drescher, Markus Drescher, Jörg Rossbach, Jörg Rossbach, Matthew Zepf, Matthew Zepf, Franz Tavella, 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); doi: 10.1117/12.888969; https://doi.org/10.1117/12.888969
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