A5032097205- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Radiation Therapy and Dosimetry
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Magnetic confinement fusion research
- Laser-Matter Interactions and Applications
- Advanced Radiotherapy Techniques
- Ion-surface interactions and analysis
- Radiation Effects and Dosimetry
- Gamma-ray bursts and supernovae
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Nuclear Physics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Electron and X-Ray Spectroscopy Techniques
- Mass Spectrometry Techniques and Applications
- Radiation Effects in Electronics
- Advanced Surface Polishing Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Optical Systems and Laser Technology
- Advancements in Photolithography Techniques
Varian Medical Systems (Germany)
2020-2023
GSI Helmholtz Centre for Heavy Ion Research
2014-2020
Technical University of Darmstadt
2010-2017
Helmholtz Institute Jena
2014-2017
Purpose To develop a method of (a) calculating the dose rate voxels within proton field delivered using pencil beam scanning (PBS), and (b) reporting representative for PBS treatment that enables correspondence between multiple modalities. This takes into account unique spatiotemporal delivery patterns FLASH radiotherapy. Methods The at each voxel radiation is approximately quotient voxel’s “effective” irradiation time. Each time starts when cumulative rises above chosen threshold value,...
UHDpulse – Metrology for advanced radiotherapy using particle beams with ultra-high pulse dose rates is a recently started European Joint Research Project the aim to develop and improve dosimetry standards FLASH radiotherapy, very high energy electron (VHEE) laser-driven medical accelerators. This paper gives short overview about current state of developments electrons protons, as well particles related challenges in due rate during radiation pulses. We summarize objectives plans project...
Abstract The energy deposition of ions in dense plasmas is a key process inertial confinement fusion that determines the α-particle heating expected to trigger burn wave hydrogen pellet and resulting high thermonuclear gain. However, measurements ion stopping are scarce mostly restricted velocities where theory agrees with data. Here, we report experimental data at low projectile near Bragg peak, force reaches its maximum. This parameter range features largest theoretical uncertainties...
The laser-driven acceleration of protons from thin foils irradiated by hollow high-intensity laser beams in the regime target normal sheath (TNSA) is reported for first time. use aims at reducing initial emission solid angle TNSA source, due to a flattening electron rear side. experiments were conducted PHELIX facility GSI Helmholtzzentrum für Schwerionenforschung GmbH with intensities range 1018 W cm−2 1020 cm−2. We observed an average reduction half opening (3.07±0.42)° or (13.2±2.0)% when...
Abstract A laser-driven, multi-MeV-range ion beamline has been installed at the GSI Helmholtz center for heavy research. The high-power laser PHELIX drives very short (picosecond) acceleration on μm scale, with energies ranging up to 28.4 MeV protons in a continuous spectrum. necessary beam shaping behind source is accomplished by applying magnetic lenses like solenoids and quadrupoles radiofrequency cavity. Based unique properties from laser-driven source, high-current single bunches could...
Using a pulse power solenoid, we demonstrate efficient capture of laser accelerated proton beams and the ability to control their large divergence angles broad energy range. Simulations using measured data for input parameters give inference into phase-space transport efficiencies captured beams. We conclude with results from feasibility study compact achromatic gantry concept. scaled target normal sheath acceleration spectrum, present simulation available spectrum after through gantry.
Laser ion acceleration provides for compact, high-intensity sources in the multi-MeV range. Using a pulsed high-field solenoid, first time laser-accelerated proton bunches could be selected from continuous exponential spectrum and delivered to large distances, containing more than ${10}^{9}$ particles narrow energy interval around central of 9.4 MeV showing $\ensuremath{\le}30\text{ }\text{ }\mathrm{mrad}$ envelope divergence. The only few nanoseconds bunch duration were characterized 2.2 m...
Abstract The 3D range-modulator is a device used in particle delivery systems that can create highly conformal and homogeneous dose distribution the target volume with mono-energetic beams, providing an option for high dose-rate FLASH therapy. In normal case, modulators are positioned at typical distance of 30-50 cm front order to avoid fluence ripples resulting from periodic structure modulators. FLUKA Monte Carlo simulation package was investigate distributions protons penetrating through...
We report on the first results of experiments with a new laser-based proton beam line at GSI accelerator facility in Darmstadt. It delivers high current bunches energies around 9.6 MeV, containing more than ${10}^{9}$ particles less 10 ns and tunable energy spread down to 2.7% ($\mathrm{\ensuremath{\Delta}}\mathrm{E}/{\mathrm{E}}_{0}$ FWHM). A target normal sheath acceleration stage serves as source pulsed solenoid provides for collimation selection. Finally synchronous radio frequency (rf)...
A new type of Faraday cup, capable detecting high energy charged particles produced in a intensity laser-matter interaction environment, has recently been developed and demonstrated as real-time detector based on the time-of-flight technique. An array these cups was designed constructed to cover different observation angles with respect target normal direction. Thus, it allows reconstruction spatial distribution ion current density subcritical plasma region ability visualise its time...
This article reports on the development of thin diamond detectors and their characterization for application in temporal profile measurements subnanosecond ion bunches. Two types diamonds were used: a 20 μm polycrystalline chemical vapor deposited (CVD) membrane with thickness (5 ± 1) etched out single crystal (sc) CVD diamond. The combination small detector electrode an impedance matched signal outlet leads to excellent time response properties pulse resolution (FWHM) τ = (113 11) ps. Such...
The acceleration of protons and light ions such as carbon by the interaction intense laser beams with solid targets has been studied for more than 10 years. Since discovery Target Normal Sheath Acceleration (TNSA) mechanism in 2000 Snavely et al. [1] a lot experiments theoretical models have used to understand physical details underlying this characterize resulting ion beam terms spatial spectral energy distribution. While required reduced an order magnitude optimized no experiment exceeded...
The LIGHT collaboration has constructed a laser-driven proton beamline at GSI Darmstadt, consisting of TNSA (target normal sheath acceleration) stage as source, pulsed solenoid for collimation and energy selection well radiofrequency cavity phase rotation the bunch. After successful commissioning characterization this beamline, first extension is now planned to perform focusing experiments, leading intense bunches with energies 8MeV in peaked spectrum only few percent spread, particle...
For ion energy loss measurements in plasmas with near solid densities, an indirect laser heating scheme for carbon foils has been developed at GSI Helmholtzzentrum f\"ur Schwerionenforschung GmbH (Darmstadt, Germany). To achieve electron density of ${10}^{22}\phantom{\rule{0.28em}{0ex}}{\mathrm{cm}}^{3}$ and temperature $10--30\phantom{\rule{0.28em}{0ex}}\mathrm{eV}$, two areal $100\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{g}/{\mathrm{cm}}^{2}$ heated a double-hohlraum...
We report on the characterization of an image plate and its absolute calibration to electrons in low keV energy range (1-30 keV). In our case, Agfa MD4.0 without protection layer was used combination with a Fuji FLA7000 scanner. The data are compared other published consistent picture sensitivity plates is obtained, which suggests validity obtained up 100 keV.