I. Will

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

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W. Sandner

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

F. Stephan

Deutsches Elektronen-Synchrotron DESY

T. Kamps

Helmholtz-Zentrum Berlin für Materialien und Energie

S. Schreiber

Deutsches Elektronen-Synchrotron DESY

J. Teichert

Helmholtz-Zentrum Dresden-Rossendorf

A. Oppelt

Deutsches Elektronen-Synchrotron DESY

D. Lipka

Deutsches Elektronen-Synchrotron DESY

Daniele Sertore

Istituto Nazionale di Fisica Nucleare, Laboratori Acceleratori e Superconduttività Applicata

J. Tümmler

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

C. Pagani

Istituto Nazionale di Fisica Nucleare, Sezione di Milano

Cooperative Institutions

Deutsches Elektronen-Synchrotron DESY

628

Universität Hamburg

167

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

129

Centre National de la Recherche Scientifique

111

European X-Ray Free-Electron Laser

103

SLAC National Accelerator Laboratory

European Organization for Nuclear Research

Helmholtz-Zentrum Berlin für Materialien und Energie

Max Planck Society

Helmholtz-Zentrum Dresden-Rossendorf

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EUV emission of Xe-clusters excited by a high-repetition rate burst mode laser

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

H. Stiel Ulrich Vogt S. Ter–Avetisyan M. Schnürer I. Will

In this contribution we describe a laser plasma source for Extreme Ultraviolet Lithography (EUVL) based on a Xe-cluster target. Although Xe-clusters as target systems for EUVL are known for some time, no attempts have been made for a systematic study of the influence of the laser parameters on the EUV-emission at a well defined Xe-aggregation. The MBI burst mode laser used offers some unique features: Within one burst (duration 800 μs) the repetition rate of single laser pulses can be adjusted between 30 and 1000 kHz. The average power per burst is about 5 kW at the maximum energy of 4 J/burst. The pulse duration of a single pulse can be adjusted from the ps- to ns-range. We have examined the EUV-emission from the Xe-cluster target within one burst of the laser as a function of single pulse intensity and repetition rate. Based on the measured EUV-spectra the conversion efficiency at 13.4 nm wavelength in dependence on pulse duration in the range from 30 ps to 3 ns were estimated.

Extreme Ultraviolet Lithography

Burst mode (computing)

Repetition (rhetorical device)

Mode (computer interface)

10.1117/12.450965

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Citations (9)

Diagnostics Beamline for the SRF Gun Project

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2005)

T. Kamps Volker Dürr K. Goldammer Dieter Krämer P. Kuske

A superconducting radio-frequency photo electron injector (SRF gun) is currently under construction by a collaboration of BESSY, DESY, FZR and MBI. The project aims at the design and setup of a CW SRF gun including a diagnostics beamline for the ELBE FEL and to address R&D issues on low emittance injectors for future light sources such as the BESSY FEL. Of critical importance for the injector performance is the control of the electron beam parameters. For this reason a compact diagnostics beamline is under development serving a multitude of operation settings ranging from low-charge (77pC), low-emittance (1 mm mrad) mode to high-charge (2.5nC) operation of the gun. For these operation modes beam dynamics simulations are resulting in boundary conditions for the beam instrumentation. Proven and mature technology is projected wherever possible, for example for current and beam position monitoring. The layout of the beam profile and emittance measurement systems is described. For the bunch length, which varies between 5 ps and 50 ps, two schemes using electro-optical sampling and Cherenkov radiation are detailed. The beam energy and energy spread is measured with a 180 o spectrometer.

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Towards a 100mA Superconducting RF Photoinjector for BERLinPro

Axel Neumann W. Anders A. Burrill Andreas Jankowiak T. Kamps

For BERLinPro, a 100 mA CW-driven SRF energy recovery linac demonstrator facility, HZB needs to develop a photo-injector superconducting cavity which delivers a at least 1mm*mr emittance beam at high average current. To address these challenges of producing a high peak brightness beam at high repetition rate, at first HZB tested a fully superconducting injector with a lead cathode*,followed now by the design of a SC cavity allowing operation up to 4 mA using CW-modified TTF-III couplers and inserting a normal conducting high quantum efficiency cathode using the HZDR-style insert scheme. This talk will present the latest results and an overview of the measurements with the lead cathode cavity and will describe the design and optimization process, the first production results of the current design and an outlook to the further development steps towards the full power version.

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Optimizations of transverse projected emittance at the photo-injector test facility at DESY, location Zeuthen

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2011)

S. Rimjaem F. Stephan M. Krasilnikov Wolfgang Ackermann G. Asova

DESY

10.1016/j.nima.2011.12.101

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Characterization of self-modulated electron bunches in an argon plasma

Journal of Physics Conference Series (2018)

Matthias Groß Osip Lishilin Gregor Loisch Prach Boonpornprasert Ye Chen

The self-modulation instability is fundamental for the plasma wakefield acceleration experiment of the AWAKE (Advanced Wakefield Experiment) collaboration at CERN where this effect is used to generate proton bunches for the resonant excitation of high acceleration fields. Utilizing the availability of flexible electron beam shaping together with excellent diagnostics including an RF deflector, a supporting experiment was set up at the electron accelerator PITZ (Photo Injector Test facility at DESY, Zeuthen site), given that the underlying physics is the same. After demonstrating the effect [1] the next goal is to investigate in detail the self-modulation of long (with respect to the plasma wavelength) electron beams.

DESY

Plasma acceleration

Bunches

Modulation (music)

10.1088/1742-6596/1067/4/042012

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Highly nonlinear ionization of atoms induced by intense high-harmonic pulses.

arXiv (Cornell University) (2019)

Björn Senfftleben Martin Kretschmar Andreas Hoffmann Mario Sauppe J. Tümmler

Intense extreme-ultraviolet (XUV) pulses enable the investigation of XUV-induced nonlinear processes and are a prerequisite for the development of attosecond pump - attosecond probe experiments. While highly nonlinear processes in the XUV range have been studied at free-electron lasers (FELs), high-harmonic generation (HHG) has allowed the investigation of low-order nonlinear processes. Here we suggest a concept to optimize the HHG intensity, which surprisingly requires a scaling of the experimental parameters that differs substantially from optimizing the HHG pulse energy. As a result, we are able to study highly nonlinear processes in the XUV range using a driving laser with a modest ($\approx 10$ mJ) pulse energy. We demonstrate our approach by ionizing Ar atoms up to Ar$^{5+}$, requiring the absorption of at least 10 XUV photons.

Extreme ultraviolet

Attosecond

Photon energy

Water window

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Compact Nd³⁺-based laser system with gain G ≤10¹³and output energy of 20 J

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1999)

A. V. Babushkin J. H. Kelly Christopher T. Cotton M. Labuzeta M. O. Miller

We have developed a compact laser system capable of amplifying nanosecond-scale pulses form a few picojoules to 20J. The system has a 40-mm clear aperture and a 37-mm working aperture for high-energy output. We measured less than 1 wave phase distortion over full 37-mm aperture for a pulse with 18-J output energy at a shot repetition rate of one shot every 10 min. In experiments with a 30-mm diam beam, a flat-top spatial profile with 4 percent rms over the entire beam diameter was demonstrated for a 1-ns pulse with 20_j output energy. The amplifier has a net gain up to 10¹³ and fits easily on a 5-ft X 14-ft optical table.

Aperture (computer memory)

Nanosecond

10.1117/12.354217

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Plasma dynamics at incident laser fluxes up to 10 18 W/cm 2

Conference on Lasers and Electro-Optics (1994)

Th. Schlegel M. Schnürer M. P. Kalashnikov P. V. Nickles F. Billhardt

Laser-matter interaction with intense (1016- 1018 W/cm2) picosecond pulses has been investigated experimentally for two essentially different cases of laser front steepness (Fig. 1). The two rising pulse fronts cause a prepulse or a prepulse-free interaction. Absorption of laser radiation as well as spectral modifications in the backscattered fundamental wave and its second harmonic were measured for various angles of incidence and some values of laser flux density. It is supposed that the red and blue frequency shifts of the backscattered waves observed are associated with Doppler shifts corresponding to inward or outward movement of the critical density surface in dependence on the shape of the laser pulse front.

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Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He⁺-Ion Irradiation

Nano Letters (2022)

Lisa-Marie Kern Bastian Pfau Victor Deinhart Michael Schneider Christopher Klose

Magnetic skyrmions are quasiparticles with nontrivial topology, envisioned to play a key role in next-generation data technology while simultaneously attracting fundamental research interest due to their emerging topological charge. In chiral magnetic multilayers, current-generated spin-orbit torques or ultrafast laser excitation can be used to nucleate isolated skyrmions on a picosecond time scale. Both methods, however, produce randomly arranged skyrmions, which inherently limits the precision on the location at which the skyrmions are nucleated. Here, we show that nanopatterning of the anisotropy landscape with a He+-ion beam creates well-defined skyrmion nucleation sites, thereby transforming the skyrmion localization into a deterministic process. This approach allows control of individual skyrmion nucleation as well as guided skyrmion motion with nanometer-scale precision, which is pivotal for both future fundamental studies of skyrmion dynamics and applications.

Skyrmion

10.1021/acs.nanolett.2c00670

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Citations (37)

WHITEBOOK ELI – Extreme Light Infrastructure; Science and Technology with Ultra-Intense Lasers

M. M. Aléonard M. Altarelli P. Antici Alexander Apolonskiy P. Audebert

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Citations (54)