A5083723358- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Radiation Therapy and Dosimetry
- Laser Design and Applications
- Advanced X-ray Imaging Techniques
- Solid State Laser Technologies
- Advanced Radiotherapy Techniques
- Nuclear Physics and Applications
- Astro and Planetary Science
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Planetary Science and Exploration
- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Effects of Radiation Exposure
- Photorefractive and Nonlinear Optics
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Pulsed Power Technology Applications
- Mass Spectrometry Techniques and Applications
- Particle Detector Development and Performance
- Digital Holography and Microscopy
Helmholtz-Zentrum Dresden-Rossendorf
2017-2024
Technische Universität Dresden
2017-2023
Abstract Recent oncological studies identified beneficial properties of radiation applied at ultrahigh dose rates, several orders magnitude higher than the clinical standard order Gy min –1 . Sources capable providing these rates are under investigation. Here we show that a stable, compact laser-driven proton source with energies greater 60 MeV enables radiobiological in vivo studies. We performed pilot irradiation study on human tumours mouse model, showing concerted preparation mice and...
Abstract Laser-driven ion accelerators can deliver high-energy, high-peak current beams and are thus attracting attention as a compact alternative to conventional accelerators. However, achieving sufficiently high energy levels suitable for applications such radiation therapy remains challenge laser-driven Here we generate proton with spectrally separated high-energy component of up 150 MeV by irradiating solid-density plastic foil targets ultrashort laser pulses from repetitive petawatt...
We report on first commissioning results of the DRACO Petawatt ultra-short pulse laser system implemented at ELBE center for high power radiation sources Helmholtz-Zentrum Dresden-Rossendorf. Key parameters essential efficient and reproducible performance plasma accelerators are presented discussed with demonstration 40 MeV proton acceleration under TNSA conditions as well peaked electron spectra unprecedented bunch charge in 0.5 nC range.
Abstract We report on experimental investigations of proton acceleration from solid foils irradiated with PW-class laser-pulses, where highest cut-off energies were achieved for temporal pulse parameters that varied significantly those an ideally Fourier transform limited (FTL) pulse. Controlled spectral phase modulation the driver laser by means acousto-optic programmable dispersive filter enabled us to manipulate shape last picoseconds around main and study effect thin foil targets. The...
Laser plasma-based particle accelerators attract great interest in fields where conventional reach limits based on size, cost or beam parameters. Despite the fact that cell simulations have predicted several advantageous ion acceleration schemes, laser not yet reached their full potential producing simultaneous high-radiation doses at high energies. The most stringent limitation is lack of a suitable high-repetition rate target also provides degree control plasma conditions required to...
Laser-driven ion sources are a rapidly developing technology producing high energy, peak current beams. Their suitability for applications, such as compact medical accelerators, motivates development of robust acceleration schemes using widely available repetitive ultraintense femtosecond lasers. These applications not only require beam but also place demanding requirements on the source stability and controllability. This can be seriously affected by laser temporal contrast, precluding...
Abstract Intense laser-driven proton pulses, inherently broadband and highly divergent, pose a challenge to established beamline concepts on the path application-adapted irradiation field formation, particularly for 3D. Here we experimentally show successful implementation of efficient (50% transmission) tuneable dual pulsed solenoid setup generate homogeneous (laterally in depth) volumetric dose distribution (cylindrical volume 5 mm diameter at single pulse 0.7 Gy via multi-energy slice...
For high-intensity laser-solid interactions, the absolute density and surface gradients of target at arrival ultrarelativistic laser peak are critical parameters. Accurate modeling leading edge-driven preexpansion is desired to strengthen predictive power associated computer simulations. The transition from an initial solid state a plasma state, i.e., breakdown solid, defines starting point subsequent preexpansion. In this work, we report on time-resolved observation transient laser-induced...
<title>Abstract</title> Laser-driven ion accelerators can deliver high-energy, high peak current beams from relativistic laser plasmas formed in solid-density materials [1, 2]. This innovative concept attracts a lot of attention for various multidisciplinary applications as compact alternative to conventional [3]. However, achieving energy levels suitable such radiation therapy remains challenge laser-driven accelerators. Here, we report on experimental generation plasma-accelerated proton...
Abstract The interaction between intense 30 fs laser pulses and foam-coated 1.5 μ m-thick Al foils in the relativistic regime (up to 5 × 10 20 W cm −2 ) is studied optimize energy conversion into laser-accelerated protons. A significant enhancement observed for foam targets terms of proton cut-off (18.5 MeV) number protons above 4.7 MeV (4 9 protons/shot) with respect uncoated (9.5 MeV, 1 protons/shot), together a sixfold increase bremsstrahlung yield. This attributed increased absorption...
Abstract The recently observed FLASH effect describes the observation of normal tissue protection by ultra-high dose rates (UHDR), or delivery in a fraction second, at similar tumor-killing efficacy conventional and promises great benefits for radiotherapy patients. Dedicated studies are now necessary to define robust set application parameters identify underlying mechanisms. These require particle accelerators with variable temporal characteristics numerous radiation qualities, equipped...
In the effort of achieving high-energetic ion beams from interaction ultrashort laser pulses with a plasma, volumetric acceleration mechanisms beyond Target Normal Sheath Acceleration have gained attention. A relativisticly intense can turn near critical density plasma slowly transparent, facilitating synchronized ions at moving relativistic front. While simulations promise extremely high energies in this regime, challenge resides realization movement ultra-relativistic pulse ($a_0\gtrsim...
We report on a compact diode-pumped, chirped pulse regenerative amplifier system with duration of 162 fs and an output energy 1 mJ before as well 910 µ J after compression optimized for the probing ultrafast relativistic laser-plasma processes. A volume Bragg grating (CVBG) acts combined stretcher/compressor representing robust solution CPA laser in millijoule range. Yb 3+ :CaF 2 is used gain medium to support large bandwidth 16 nm (FWHM) when spectral shaping applied. Chirped mirrors...
Abstract Due to the non-linear nature of relativistic laser induced plasma processes, development laser-plasma accelerators requires precise numerical modeling. Especially high intensity laser-solid interactions are sensitive temporal rising edge and predictive capability simulations suffers from incomplete information on state at onset interaction. Experimental diagnostics utilizing ultra-fast optical backlighters can help ease this challenge by providing temporally resolved inside into...
We present a method extending scanning third-order correlator temporal pulse evolution measurement capabilities of high power short lasers to spectral sensitivity within the range exploited by typical chirped amplification systems. Modelling response achieved angle tuning third harmonic generating crystal is applied and experimentally validated. Exemplary measurements spectrally resolved contrast Petawatt laser frontend illustrate importance full bandwidth coverage for interpretation...
Probing the rapid dynamics of plasma evolution in laser-driven interactions provides deeper understanding experiments context ion acceleration and facilitates interplay with complementing numerical investigations. Besides microscopic scales involved, strong (self-)emission, predominantly around harmonics driver laser, often complicates data analysis. We present concept implementation a stand-alone probe laser system that is temporally synchronized to providing probing wavelengths beyond...
Abstract Laser-plasma proton acceleration was investigated in the target normal sheath regime with a composed of gas layer and thin foil. The laser’s shape, duration, energy frequency are modified as it propagates gas, altering laser-solid interaction leading to acceleration. properties laser were assessed by both numerical simulations measurements. 3D particle-in-cell have shown that nearly seven-fold increase peak intensity at foil plane is possible. In experiment, maximum energies showed...
We present light induced refractive index changes in iron doped lithium niobate detected with a novel microscopy technique called ptychography. This method determines the change of together intensity distribution writing beam from single scan reconstructed spatial resolution 3 μm and sensitivity 10-5. show that is strongly connected to shape it shows expected nonlocal behaviour. Applying investigation photorefractive effect offers an excellent opportunity study this response beam.
Application experiments with laser plasma-based accelerators (LPA) for protons have to cope the inherent fluctuations of proton source. This creates a demand non-destructive and online spectral characterization pulses, which are application mostly spectrally filtered transported by beamline. Here, we present scintillator-based time-of-flight (ToF) beam monitoring system (BMS) recording single-pulse energy spectra. The setup's capabilities showcased characterizing stability transport LPA two...
Abstract Particle-in-cell (PIC) simulations are a widely-used tool to model kinetics-dominated plasmas in ultrarelativistic laser-solid interactions (dimensionless vectorpotential 0 > 1). However, approaching subrelativistic laser intensities ( ≲ 1) governed by correlated and collisional plasma physics, calling for benchmarks of available modeling capabilities the establishment standardized testbeds. Here, we propose such testbed experimentally benchmark PIC using laser-irradiated...
Abstract Laser-plasma based ion accelerators require suitable high-repetition rate target systems that enable systematic studies at controlled plasma conditions and application-relevant particle flux. Self-refreshing, micrometer-sized cryogenic jets have proven to be an ideal platform. Yet, operation of such in the harsh environmental high power laser induced experiments turned out challenging. Here we report on recent deploying a hydrogen jet as source pure proton beams generated with...
Objective.Laser plasma-based accelerators (LPAs) of protons can contribute to research ultra-high dose rate radiobiology as they provide pulse rates unprecedented at medical proton sources. Yet, LPAs pose challenges regarding precise and accurate dosimetry due the high rates, but also sources' lower spectral stability pulsed operation mode. Forin vivomodels, further arise from necessary small field for volumetric distributions. For these novel source parameters intended applications, a...
Abstract In laser-ion acceleration experiments, the interaction of rising flank a high power laser pulse with target can cause pre-ionization and subsequent pre-expansion long before arrival main peak. Exact knowledge this is required in order to understand laser-plasma mechanisms help numerical simulations.&#xD;For dielectric targets, starting point characterized by time at which undergoes laser-induced breakdown (LIB). work, we present method determine LIB sub-micron-thick Formvar...