A5088195255- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Laser-induced spectroscopy and plasma
- Plasma Applications and Diagnostics
- Fusion materials and technologies
- Gyrotron and Vacuum Electronics Research
- Ionosphere and magnetosphere dynamics
- Spectroscopy and Laser Applications
- Mass Spectrometry Techniques and Applications
- Catalytic Processes in Materials Science
- Laser Design and Applications
- Metal and Thin Film Mechanics
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Ion-surface interactions and analysis
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Chemical Physics Studies
- Diamond and Carbon-based Materials Research
- High voltage insulation and dielectric phenomena
Max Planck Institute for Plasma Physics
2016-2025
University of Augsburg
2016-2025
Augsburg University
1999-2025
Laboratoire de Physique des Gaz et des Plasmas
2013-2023
Robert Bosch (Germany)
2023
Max Planck Society
2012-2021
National Agency for New Technologies, Energy and Sustainable Economic Development
2019-2021
University of Padua
2019-2021
Fraunhofer Institute for Ceramic Technologies and Systems
2020
Institute of Plasma Physics
2018
The development of a large-area RF source for negative hydrogen ions, an official EFDA task agreement, is aiming at demonstrating ITER-relevant ion parameters. This implies current density 200 A m−2 accelerated D− ions filling pressure ⩽0.3 Pa and electron-to-ion ratio ⩽1 from extraction area similar to the positive-ion based sources JET ASDEX Upgrade pulse lengths up 1 h. work progressing along three lines in parallel: (i) optimization densities low electron/ion ratio, utilizing small areas...
These lecture notes are intended to give an introductory course on plasma spectroscopy. Focusing emission spectroscopy, the underlying principles of atomic and molecular spectroscopy in low temperature plasmas explained. This includes choice proper equipment calibration procedure. Based population models, evaluation spectra their information content is described. Several common diagnostic methods presented, ready for direct application by reader, obtain a multitude parameters
The development of negative hydrogen ion sources for neutral beam systems is closely linked with an optimization formation in plasmas, which requires knowledge the plasma parameters. Emission spectroscopy introduced as a non-invasive and situ diagnostic tool line sight averaged Diagnostic lines simplified analysis methods variety parameters, such electron density temperature, gas atomic molecular density, caesium densities (atoms ions), are identified prepared direct application. Emphasis...
The ITER Neutral Beam Test Facility (NBTF), called PRIMA (Padova Research on Megavolt Accelerator), is hosted in Padova, Italy and includes two experiments: MITICA, the full-scale prototype of heating neutral beam injector, SPIDER, full-size radio frequency negative-ions source. NBTF realization exploitation SPIDER MITICA have been recognized as necessary to make future operation injectors efficient reliable, fundamental achievement thermonuclear-relevant plasma parameters ITER. This paper...
The ITER neutral beam system will be equipped with radio-frequency (RF) negative ion sources, based on the IPP Garching prototype source design. Up to 100 kW at 1 MHz is coupled RF driver, out of which plasma expands into main chamber. Compared arc driven sources are maintenance free and without evaporation tungsten. modularity driver concept permits supply large volumes. (one driver) demonstrated operation in hydrogen deuterium up one hour relevant parameters. ELISE test facility operating...
The ITER project requires additional heating by two neutral beam injectors, each accelerating to 1 MV a 40 A of negative deuterium ions, deliver the plasma power about 17 MW for one hour. As these requirements have never been experimentally met, it was recognized as necessary setup test facility, PRIMA (Padova Research on Megavolt Accelerator), in Italy, including full-size ion source, SPIDER, and prototype whole injector, MITICA, aiming develop injectors be installed ITER. This realization...
Abstract The ASDEX Upgrade (AUG) programme is directed towards physics input to critical elements of the ITER design and preparation operation, as well addressing issues for a future DEMO design. Since 2015, AUG equipped with new pair 3-strap ICRF antennas, which were designed reduction tungsten release during operation. As predicted, factor two on ICRF-induced W plasma content could be achieved by sheath voltage at antenna limiters via compensation image currents central side straps in...
The European DEMO is a pulsed device with pulse length of 2 hours. functions devoted to the heating and current drive system are: plasma breakdown, ramp-up flat-top where fusion reactions occur, control during phase, finally ramp-down. EU-DEMO project was in Pre-Concept Design Phase 2014-2020, meaning that some cases, design values precise requirements from physics point view were not yet frozen. A total 130 MW considered for all phases plasma: flat top, 30 required neoclassical tearing...
Improvement of the CO2 conversion using a 2.45 GHz microwave plasma torch in reverse vortex configuration with cooled effluent channels at atmospheric pressure is reported. This allows for fast gas quenching by efficient cooling effluent, which leads to and energy efficiency results 900 mbar that are very similar highest values typically obtained lower pressures (100–200 mbar). The convective long proved be effective, particularly multiple channels, where effective surface was increased...
A fully automated Langmuir probe system capable of operating simultaneously with beam extraction has been developed and commissioned for the negative hydrogen ion source testbeds at IPP Garching. It allows measurement temporal spatial distributions plasma parameters within a single pulse (<5 s). This can operate even in presence multi-harmonic RF interference due to novel transformer-based compensation system. Analysis methods data are described paper along discussion errors. Measurements...
ASDEX Upgrade has recently finished its transition towards an all-W divertor tokamak, by the exchange of last remaining graphite tiles to W-coated ones. The plasma start-up was performed without prior boronization. It found that large He content in plasma, resulting from DC glow discharges for conditioning, leads a confinement reduction. After change D inter-shot quickly dropped and, parallel, usual H-Mode with H factors close one achieved. initial conditioning phase, oxygen concentrations...
For heating and current drive the neutral beam injection (NBI) system for ITER requires a 1 MeV deuterium up to h pulse length. In order inject required 17 MW large area source (1.9 m × 0.9 m) has deliver 40 A of negative ion at specified pressure 0.3 Pa. 2007, IPP RF driven hydrogen was chosen by board as new reference NBI due to, in principle, its maintenance free operation progress development. The performance analysis sources is strongly supported an extensive diagnostic program...
IPP Garching has successfully developed a RF-driven negative ion source for the ITER neutral beam injection system. The RF is now an interesting alternative to reference design with filamented sources due its in principle maintenance-free operation. Current densities of 330 A m−2 and 230 have been achieved hydrogen deuterium, respectively, at pressure 0.3 Pa electron/ion ratio 1 small extraction area (7.0 × 10−3 m2) short pulses (<4 s). Reliable deuterium operation more than 150 required...
For heating and current drive the neutral beam injection system for ITER requires a deuterium with an energy of 1 MeV up to h. In order inject required 17 MW ion source has deliver 40 A negative current. accelerated density 200 m−2 at specified pressure 0.3 Pa extraction area is 0.2 m2 resulting in large 1.5 × 0.6 m2. Two types sources have been under discussion, filamented arc inductively driven RF source, latter now having chosen reference design. The development sources, which fulfil...
Powerful negative hydrogen ion sources are required for heating and current drive at ITER.The physics of production extraction high currents is much more complex than positive ions.One the most relevant parameters shape plasma sheath, which determines velocity surface produced ions thus probability to reach system.In order investigate influence atoms, caesium on a 1d3v PIC code close system has been developed.For typical such sources, conversion impinging atoms main channel, while plays...
Axially resolved measurements of plasma parameters were performed by two Langmuir probes moving in parallel from the exit driver (where is generated) up to extraction region neighbourhood IPP RF negative hydrogen ion source prototype. At exit, show an unexpected inhomogeneity presence magnetic field: a cold and dense flows out top part while hot low density bottom part. A local relation between derived conservation energy flux.
Abstract The optical emission spectra of high pressure CO 2 microwave plasmas are usually dominated by the C Swan bands. In this paper, use bands for estimating gas temperature in is assessed. State state fitting employed to check correctness assuming a Boltzmann distribution rotational and vibrational functions and, within statistical systematic uncertainties, band can be fitted accurately with single levels. processes leading production molecule particularly its <?CDATA...
Microwave plasmas are a promising technology for energy-efficient CO$_{2}$ valorization via conversion of into CO and O$_2$ using renewable energies. A 2.45 GHz microwave plasma torch with swirling gas flow is studied in large pressure (60-1000~mbar) (5-100~slm) range. Two different modes the torch, depending on operating input power, described: at pressures below 120~mbar fills most volume whereas about an abrupt contraction center resonator observed along increase temperature from 3000~K...
Abstract ITER is of key importance in the European fusion roadmap as it aims to prove scientific and technological feasibility a future energy source. The EUROfusion consortium labs within Europe contributing preparation exploitation operation aspires exploit outcomes view DEMO. paper provides an overview major progress obtained recently, carried out frame new (initiated 2021) work-package called ‘ Pr eparation I TER O peration’ (PrIO). directly supported by eleven PrIO contributions given...