Mr. Tim Ziegler Profile

Tim Ziegler

at Helmholtz-Zentrum Dresden-Rossendorf

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Author

Publications (8)

Proceedings Article | 9 June 2023 Presentation

Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities (Conference Presentation)

Nicholas Dover, Tim Ziegler, Stefan Assenbaum, Constantin Bernert, Stefan Bock, Florian-Emanuel Brack, Thomas Cowan, Emma Jane Ditter, Marco Garten, Lennart Gaus, Ilja Goethel, George Hicks, Hiromitsu Kiriyama, Thomas Kluge, James Koga, Akira Kon, Kotaro Kondo, Stephan Kraft, Florian Kroll, Hazel Lowe, Josefine Metzkes-Ng, Tatsuhiko Miyatake, Zulfikar Najmudin, Thomas Püschel, Martin Rehwald, Marvin Reimold, Hironao Sakaki, Hans-Peter Schlenvoigt, Keiichiro Shiokawa, Marvin E. Umlandt, Ulrich Schramm, Karl Zeil, Mamiko Nishiuchi

Proceedings Volume PC12579, PC125790Q (2023) https://doi.org/10.1117/12.2669273

KEYWORDS: Ions, Transparency, Pulsed laser operation, Ion lasers, Plasma, Modeling, Mirrors, Laser systems engineering, Laser irradiation, Laser energy

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Proceedings Article | 9 June 2023 Presentation

Surpassing TNSA performance in laser proton acceleration in the relativistic transparency regime (Conference Presentation)

Karl Zeil, Stefan Assenbaum, Constantin Bernert, Florian Brack, Thomas Kluge, Florian Kroll, Josefine Metzkes-Ng, Martin Rehwald, Marvin Umlandt, Milenko Vescovi, Tim Ziegler, Ulrich Schramm

Proceedings Volume PC12579, PC125790D (2023) https://doi.org/10.1117/12.2667089

KEYWORDS: Transparency, Plasma, Ions, High power lasers, Simulations, Reproducibility, Plastics, Plasma generation, Physics, Photonic integrated circuits

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Proceedings Article | 9 June 2023 Presentation

Laser transmission in the relativistically-induced transparency regime for high performance proton acceleration at PW laser systems (Conference Presentation)

Marvin Elias Paul Umlandt, Tim Ziegler, Nicholas Dover, Ilja Göthel, Thomas Kluge, Chang Liu, Thomas Püschel, Milenko Vescovi, Mamiko Nishiuchi, Josefine Metzkes-Ng, Karl Zeil, Ulrich Schramm

Proceedings Volume PC12579, PC125790H (2023) https://doi.org/10.1117/12.2665721

KEYWORDS: Transparency, Laser systems engineering, Fusion energy, Plasma, Laser stabilization, Laser applications, Tumors, Solids, Plasma generation, Mouse models

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Proceedings Article | 9 June 2023 Presentation

Transient laser-induced breakdown of dielectrics in ultra-relativistic laser-solid interactions (Conference Presentation)

Constantin Bernert, Stefan Assenbaum, Stefan Bock, Florian-Emanuel Brack, Thomas Cowan, Chandra Curry, Marco Garten, Lennart Gaus, Maxence Gauthier, René Gebhardt, Sebastian Göde, Siegfried Glenzer, Uwe Helbig, Thomas Kluge, Stephan Kraft, Florian Kroll, Lieselotte Obst-Huebl, Thomas Pueschel, Martin Rehwald, Hans-Peter Schlenvoigt, Christopher Schönwälder, Ulrich Schramm, Franziska Treffert, Milenko Vescovi, Tim Ziegler, Karl Zeil

Proceedings Volume PC12579, PC125790U (2023) https://doi.org/10.1117/12.2665586

KEYWORDS: Laser induced damage, Laser induced breakdown spectroscopy, Dielectrics, Solids, Pulsed laser operation, Laser damage threshold, Plasma, Laser applications, Ionization, Hydrogen

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Proceedings Article | 8 June 2023 Presentation

Tumor irradiation in mice with a laser-accelerated proton beam

Florian-Emanuel Brack, Florian Kroll, Elke Beyreuther, Stephan Kraft, Josefine Metzkes-Ng, Jörg Pawelke, Marvin Reimold, Ulrich Schramm, Marvin Elias Paul Umlandt, Tim Ziegler, Karl Zeil

Proceedings Volume PC12583, PC1258309 (2023) https://doi.org/10.1117/12.2665304

KEYWORDS: Tumors, In vivo imaging, Laser irradiation, Animal model studies, Tumor growth modeling, Reliability, Mouse models, Laser radiation, High power lasers, Dosimetry

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Proceedings Article | 18 April 2021 Presentation

Fully characterised and online monitored beamline for high-dose-rate laser-proton irradiation experiments at Draco PW

Florian-Emanuel Brack, Florian Kroll, Lennart Gaus, Constantin Bernert, Elke Beyreuther, Thomas Cowan, Leonhard Karsch, Stephan Kraft, Elisabeth Lessmann, Josefine Metzkes-Ng, Jörg Pawelke, Martin Rehwald, Marvin Reimold, Hans-Peter Schlenvoigt, Ulrich Schramm, Manfred Sobiella, Marvin Umlandt, Tim Ziegler, Karl Zeil

Proceedings Volume 11790, 1179008 (2021) https://doi.org/10.1117/12.2596503

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Laser-driven proton pulse provide unique properties in terms of pulse structure (ns) and instantaneous dose rate (10^9 Gy/s) but - inherently broadband and highly divergent - pose a challenge to established beamline concepts on the path to application-adapted irradiation field formation, particularly for three-dimensional cases. We present the successful implementation and characterisation of a highly efficient and tuneable dual pulsed solenoid beamline at the Draco PW facility[1] to generate volumetric dose distribution tailored to specific applications[2]. The vast experimental scope and already successfully performed studies range from systematic volumetric in-vivo tumour irradiations in a dedicated mouse model (with a stable mean dose delivery of ±10 % and a spatial dose homogeneity of ±5 % over a cylindrical volume of 5 mm diameter and height) to high-dose-rate irradiations in the FLASH regime (using proton peak dose rates of up to 10^9 Gy/s with about 20 Gy/shot homogeneously over a cylindrical sample volume of 4.5 mm diameter and 3 mm height) as well as particle diagnostics commissioning (with a multitude of spatial and spectral dose distributions). The beamline setup is complemented by a complex beam monitoring and dosimetry detector suite adapted to the ultra-high dose rate pulses and is in its unique synergy and redundancy capable of %-level precision dose delivery to samples as required for systematic irradiation studies. In addition to established radiochromic film dosimetry, the detector suite includes saturation-corrected (transmission) ionisation chambers [3] as well as screen and bulk scintillator setups, partly with tomographic reconstruction capabilities for 3D dose distribution retrieval. Moreover, non-invasive, single-shot-capable online time-of-flight-based spectral characterisation of filtered proton pulses has proven a powerful tool for beam monitoring as well as dosimetric purposes. In this presentation the complex and versatile dose delivery system of laser-driven protons at the Draco PW using pulsed solenoids will be discussed. Its characterisation, technological development and improvement as well as the dosimetry suite as a vital part of the precise dose delivery will be addressed, while the presentation by U. Schramm covers recent experimental activities in detail. [1] T. Ziegler, et al., Proton beam quality enhancement by spectral phase control of a PW-class laser system, https://arxiv.org/abs/2007.11499 (2020) [2] Brack, et al., Spectral and spatial shaping of laser-driven proton beams using a pulsed high-field magnet beamline, SciRep, 10:9118, (2020) [3] Gotz M, et al., A new model for volume recombination in plane‐parallel chambers in pulsed fields of high dose‐per‐pulse. Phys Med Biol., 62: 8634, (2017)

Proceedings Article | 14 May 2019 Presentation

Off-harmonic optical probing of high-intensity laser interaction with hydrogen targets using a stand-alone probe laser system (Conference Presentation)

Karl Zeil, Constantin Bernert, Stephan Kraft, Markus Löser, Josefine Metzkes-Ng, Lieselotte Obst-Huebl, Martin Rehwald, Mathias Siebold, Tim Ziegler, Ulrich Schramm

Proceedings Volume 11037, 1103704 (2019) https://doi.org/10.1117/12.2520884

KEYWORDS: Hydrogen, Laser beam diagnostics, Laser systems engineering, Plasma, Cryogenics, Ion beams, Computer simulations, Data conversion, Data analysis, Mode locking

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The development of high-intensity short-pulse lasers in the Petawatt regime offers the possibility to design new compact accelerator schemes by utilizing high-density targets for the generation of ion beams with multiple 10 MeV energy per nucleon. The optimization of the acceleration process demands comprehensive exploration of the plasma dynamics involved, for example via spatially and temporally resolved optical probing. Experimental results can then be compared to numerical particle-in-cell simulations, which is particularly sensible in the case of cryogenic hydrogen jet targets [1]. However, strong plasma self-emission and conversion of the plasma’s drive laser wavelength into its harmonics often masks the interaction region and interferes with the data analysis. Recently, the development of a stand-alone and synchronized probe laser system for off-harmonic probing at the DRACO laser operated at the Helmholtz-Zentrum Dresden–Rossendorf showed promising performance [2]. Here, we present an updated stand-alone probe laser system applying a compact CPA system based on a synchronized fs mode-locked oscillator operating at 1030 nm, far off the plasma’s drive laser wavelength of 800 nm. A chirped volume Bragg grating (Optigrate Corp) is used as a hybrid stretcher and compressor unit. The system delivers 160 fs pulses with a maximum energy of 0.9 mJ. By deploying the upgraded probe laser system in the laser-proton acceleration experiment with the renewable cryogenic hydrogen jet target, the plasma self-emission could be significantly suppressed while studying the temporal evolution of the expanding plasma jet. Recorded probe images resemble those of z-pinch experiments with metal wires and indicate a sausage-like instability along the jet axis, which will be discussed. References [1] L. Obst, et al. Efficient laser-driven proton acceleration from cylindrical and planar cryogenic hydrogen jets. Sci. Rep., 7:10248, 2017. [2] T. Ziegler, et al. Optical probing of high intensity laser interaction with micron-sized cryogenic hydrogen jets. Plasma Phys. Control. Fusion, 2018. doi:10.1088/1361-6587/ aabf4f. [3] C.P. João, et al. Dispersion compensation by two-stage stretching in a sub-400 fs, 1.2 mJ Yb:CaF2 amplifier. Opt. Express, 22:10097–10104, 2014.

Proceedings Article | 14 May 2019 Presentation

All-optical structuring of laser-driven proton beam profiles (Conference Presentation)

Tim Ziegler, Lieselotte Obst-Huebl, Florian-Emanuel Brack, Joao Branco, Michael Bussmann, Thomas Cowan, Chandra Curry, Frederico Fiuza, Marco Garten, Maxence Gauthier, Sebastian Göde, Siegfried Glenzer, Axel Huebl, Arie Irman, Jongjin Kim, Thomas Kluge, Stephan Kraft, Florian Kroll, Josefine Metzkes-Ng, Richard Pausch, Irene Prencipe, Martin Rehwald, Christian Rödel, Hans-Peter Schlenvoigt, Ulrich Schramm, Karl Zeil

Proceedings Volume 11037, 1103707 (2019) https://doi.org/10.1117/12.2520762

KEYWORDS: Pulsed laser operation, Plasma, Ionization, Laser beam propagation, Cryogenics, Hydrogen, Mirrors, Laser interferometry, Interferometry, Collimation

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Extreme field gradients intrinsic to relativistic laser plasma interactions enable compact MeV proton accelerators with unique bunch characteristics. Yet, direct control of the proton beam profile is usually not possible. So far, only complex micro-engineering of the relativistic plasma accelerator itself and limited adoption of conventional beam optics provided access to global beam parameters that define propagation. We present a novel, counter-intuitive all-optical approach to imprint detailed spatial information from the driving laser pulse to the proton bunch. The concept was motivated by an effect initially observed in an experiment dedicated to laser-driven proton acceleration from a renewable micrometer sized cryogenic Hydrogen jet target at the 150 TW Draco laser at HZDR. A compact, recollimating single plasma mirror was used to enhance the temporal laser contrast, which could be monitored on a single-shot base by means of self-referenced spectral interferometry with extended time excursion (SRSI-ETE) at unprecedented dynamic and temporal range. Unexpectedly, the accelerated proton beam profile showed in this experiment prominent features of the collimated laser beam, such as the shadow of obstacles inserted deliberately in the beam. In a series of further experiments, the spatial profile of the energetic proton bunch was found to exhibit identical features as the fraction of the laser pulse passing around a target of limited size. The formation of quasi-static electric fields in the beam path by ionization of residual gas in the experimental chamber results in asynchronous information transfer between the laser pulse and the naturally delayed proton bunch. Such information transfer between the laser pulse and the naturally delayed proton bunch is attributed to the formation of quasi-static electric fields in the beam path by ionization of residual gas. Essentially acting as a programmable memory, these fields provide access to a new level of proton beam manipulation.

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