Ort: Garching und Greifswald

Deuterium permeation measurements on tungsten near room temperature - tba

HEPP Seminar
[mehr]

HEPP Seminar

HEPP Seminar
Kinetic effects in Electron Parallel Transport in Scrape-Off Layer / Investigations of cesium dynamics in RF negative ion sources with CsFlow3D code [mehr]

HEPP Seminar

HEPP Seminar
A new thermal He-beam diagnostic for electron density and temperature measurements in the scrape-off layer of ASDEX Upgrade / Power loads in the limiter phase of Wendelstein 7-X [mehr]

Eingearbeiteter Tag Garching

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Automatisches Fahren – Wie? Wo? Wann? Überhaupt?

Institutskolloquium
Die Historie des automatischen Fahrens zeigt, dass schon seit fast 30 Jahren immer wieder prototypisch automatische fahrende Fahrzeuge aufgebaut und demonstriert wurden. Dies waren in der Regel eine Demonstration des machbaren, häufig jedoch weit von einer Serienanwendung entfernt. Aktuelle Forschungsprojekte zeigen, dass die Entwicklung in den letzten Jahren rasch vorangeschritten ist. Somit erwarten derzeit viele die Einführung des automatischen Fahrens in den nächsten Jahren. Viele Probleme, die immer noch vorhanden sind, werden ausgeblendet. Prof. Lienkamp zeigt auf, ob und wie die Probleme gelöst werden können und welche Funktionen danach noch realistisch umsetzbar sind. Die Auswirkungen auf die Zulieferer werden diskutiert. [mehr]

Radial Electric Field Studies in the Near SOL using Charge Exchange Recombination Spectroscopy / Study of the gas balance of W7-X

HEPP Seminar
[mehr]

Impact of an integrated core/SOL description on the optimization of fusion reactors

ASDEX Upgrade seminar: ASDEX Upgrade Seminar
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Energie Offshore Speichern

Institutskolloquium
Das Projekt umfasst Entwicklung und Erprobung eines neuartigen Pumpspeicherkonzeptes zur Speicherung großer Mengen elektrischer Energie offshore. Das Konzept des Meeres-Pumpspeicherkraftwerk nutzt das Meer selbst als oberes Speicherreservoir. Das untere Speicherbecken wird durch einen Hohlkörper auf dem Meeresgrund gebildet, der im Pumpbetrieb mit Ladestrom leer gepumpt wird und im Entladebetrieb über eine Turbine zum Generatorantrieb wieder mit Wasser gefüllt wird. [mehr]

Coil optimization towards robust magnetic field properties / Fast collapses of central plasma confinement driven by localized ECCD at W7-X / Investigation of optically grey cyclotron harmonics

HEPP Seminar
[mehr]

Physics Highlights from the LHCb Experiment

Institutskolloquium
The LHCb detector at the Large Hadron Collider has been optimised for the study of rare decays of heavy flavour particles and the breaking of the symmetry between matter and antimatter. After a general introduction to the experiment, the talk will focus on the most important results obtained so far and their relevance for the search of physics beyond the Standard Model. [mehr]

Dense matter in neutron stars

Institutskolloquium
Neutron stars are born as the endpoint of stellar evolution in core-collapse supernovae. The densities in a neutron star are extremely high, so high that nuclei are squeezed into their constituents, neutrons and protons. Exotic matter can appear in the core, either in the form of hyperons or as a new phase in the form of strange quark matter. The properties of neutron stars are determined by the nuclear equation of state of dense matter, so that the observation of neutron stars and neutron star merger can give a telltale signature of the properties of dense matter under extreme conditions. The present astrophysical data on neutron stars and pulsars, rotation-powered neutron stars, is reviewed. The equation of state of dense matter will be discussed and possible implications for future observations of core-collapse supernovae and neutron star mergers will be outlined. [mehr]

New approaches to stable models for computational plasma physics

Institutskolloquium
Due to the presence of multiple physical scales and complex nonlinear interactions, the numerical simulation of fusion plasmas often leads to computational problems of huge complexity. A long-standing challenge is then to design numerical methods that are computationally efficient, high order accurate and stable on very long time scales. Fortunately, steady progresses in the theory of structure-preserving discretizations have provided a solid mathematical ground for the development of stable high order numerical schemes. In this lecture I will give a brief review of the compatible Finite Element methods that have been developed in this direction, and I will explain how these tools are now being extended to design stable numerical models for the Vlasov-Maxwell equations. Recent ideas that allow to further improve the computational efficiency of such methods will be presented, along with a novel approach to low-noise particle approximations. [mehr]

IPP Programme Days 2018

During the annual Programme Days the scientific programme of IPP's research divisions is presented and discussed. [mehr]

From the beginnings to the (preliminary?) end of the North Korean missile program

Institutskolloquium
Comparing North Korea's achievements in the field of missiles with the programs of other countries, one gets the impression that North Korea is a nation of rocket scientists. The recent glorious successes appear like a deja vu of the early days of North Korea's missile program in the 1980s and 1990s, when the country managed to present a full missile program out of the blue. But a close look from an engineer's perspective reveals some discrepancies in the common narrative, thus allowing for some surprising insights into the current situation of North Korea's missile threat. [mehr]

Phase Contrast Imaging on Wendelstein 7-X / Dependence of B-limit and confinement of low collisional H-modes on q-profile / Integrated modelling of plasma confinement combining core and edge pedestal Physics

HEPP Seminar
[mehr]

The European Spallation Source: New Opportunities for Science

Institutskolloquium
The European Spallation Source (ESS), which is currently under construction in Lund, Sweden, is designed to push the limits of research with neutrons to new horizons. ESS will open up new scientific opportunities which are complementary to those at X-ray sources. These will include unprecedented in-situ and in-operando experiments which are only possible with neutrons due to their special properties. After a short summary of the design and the specifications of the European Spallation Source an overview of the current status and schedule of the ESS construction project will be given with a strong focus on the instruments and the surrounding scientific infrastructure. The overall goal of ESS is to begin user operation in 2023 and ramp up to 15 instruments by 2026. Selected examples of new scientific opportunities in the field of materials and life science will be discussed. [mehr]

Updates on Recent Work from Princeton: stability, disruption avoidance, pedestal, liquid metals

ASDEX Upgrade Seminar
[mehr]

Solar geoengineering - taking the edge off climate change?

Institutskolloquium
Despite the progress made at the Paris climate talks with respect to reducing emissions of greenhouse gases it is possible that the rate of environmental change may result in extensive negative impacts for humans and natural ecosystems. Clearly, emissions cuts are essential to managing climate risk and reducing climate change. However, given the potential consequences of a high rate of environmental change, it is important to investigate complementary approaches. For example, geoengineering methods aimed at altering earth's radiation budget may offer a fast-acting way of moderating the rate of climate change. However, such geoengineering approaches entail a number of new risks, and cannot replace reducing CO2 emissions/levels. I will discuss different geoengineering methods, focusing on new approaches to stratospheric solar radiation management, highlighting technical capabilities and risk. I will also briefly discuss questions surrounding the potential implementation of such approaches. [mehr]

Edge localized modes and disruptions – Insights into large-scale plasma instabilities from non-linear magneto-hydrodynamic simulations

Institutskolloquium
Large-scale plasma instabilities with the potential of damaging wall structures or reducing their lifetime are a significant concern for magnetic confinement fusion. Among the most critical are disruptions and edge localized modes. Predicting the behavior of such instabilities and their control for ITER and beyond is a challenging task for which input from experiments, theory, and simulations is needed. This presentation describes non-linear MHD simulations of edge localized modes, disruptions and control strategies. The talk will explain why simulations or large-scale instabilities are needed and show that our simulations have already revealed a lot of aspects about the physics of large-scale instabilities. It will also give some insights into the actual work involved “behind the scenes” and challenges we are facing for the future. [mehr]

Physics-based Deep Learning for Fluids

Institutskolloquium
In this talk I will focus on the possibilities that arise from recent advances in the area of deep learning for accelerating and improving physics simulations. I will focus on fluids, which encompass a large class of materials we encounter in our everyday lives. In addition to being ubiquitous, the underlying physical model, the Navier-Stokes equations, at the same time represent a challenging, non-linear advection-diffusion PDE that poses interesting challenges for deep learning methods. I will explain and discuss several research projects from our lab that focus on temporal predictions of physical functions, temporally coherent adversarial training, and predictions of steady-state turbulence solutions. Among other things, it turns out to be useful to make the learning process aware of the underlying physical principles. Here, especially the transport component of the Navier-Stokes equations plays a crucial role. I will also give an outlook about open challenges in the area of deep learning for physical problems. Most importantly, trained models could server as priors for a variety of inverse and control problems. [mehr]

Linking the International System of Units to Fundamental Constants

Institutskolloquium
  • Datum: 07.06.2019
  • Uhrzeit: 09:00 - 10:30
  • Vortragende(r): Prof. Dr. Joachim Ullrich
  • Joachim Ullrich studied geophysics and physics at Frankfurt University. He held positions at GSI, Darmstadt, at the Kansas State University, the University of Missouri, was chair of Experimental Physics at the University of Freiburg, before he was appointed a Director at the Max-Planck Institute for Nuclear Physics in Heidelberg. Since 2012 he is the President of the German National Metrology Institute, PTB. He has published more than 590 research papers and received several awards. Among them the Leibniz Award of the Deutsche Forschungsgemeinschaft (DPG), the David Bates Medal of the London Institute of Physics and the Philip Morris Research Award. He is a Fellow of the American Physical Society, an External Scientific Member of the Max-Planck Society, member of the German Academy of Science and Engineering, member of acatech, member of the Berlin-Brandenburg Academy of Sciences and Humanities and Vice President of the German Institute for Standardization, DIN. In 2012 he became a member of the International Committee for Weights and Measures (CIPM) of the Meter Convention and was elected Vice President of the CIPM in 2015 and is the President of the Consultative Committee for the International Units (CCU).
  • Ort: Garching und Greifswald
  • Raum: Hörsaal D2 (Übertragung nach HGW S1)
  • Gastgeber: IPP
In November 2018, the General Conference for Weights and Measures, CGPM, established by the Metre Convention in 1875, decided on the revision of the International System of Units (SI). The signatory states of the Metre Convention represent about 98 % of the world's economic power and, thus, the SI is the very foundation of global, international trade and the reliability of measurements worldwide. As suggested by Max Planck when postulating the "Planck constant" in 1900, the revised SI shall be based on fixing the numerical values of "defining constants": the velocity of light, the elementary charge, the Boltzmann, Avogadro and the Planck constants, the Cs hyperfine clock transition and the luminous efficacy. The revision is based on our present theoretical understanding of the microscopic world and is meant to ensure that the units are valid and realizable "for all times and civilizations, throughout the Universe" as envisioned by Max Planck. The talk will give an overview on the revised SI and its advantages as compared to the previous definitions, focusing in particular on future perspectives for innovative technologies. The question of whether the "defining fundamental constants" are indeed constant in time and the topic of next generation clocks will be addressed briefly. [mehr]

Fifty years of progress in ICRF, from first experiments on the Model C Stellarator to the design of an ICRF system for DEMO

The first significant use of ICRF occurred in the Model C stellarator in 1969, now 50 years ago. In the 70s, the emphasis was on understanding and optimizing the heating method, while in the 80s, power in the MW range became available on PLT, ASDEX, JET and TFTR. The 90s saw the start of ICRF on larger machines such as JT60, Tore Supra, Alcator C-mod and ASDEX Upgrade as well as the first applications of ICRF on D-T plasmas in JET and TFTR. ICRF capabilities beyond heating were experimentally investigated on JET in the early 2000s. From 2010, with machines such as ASDEX Upgrade and JET transiting to full-metal first walls, the interaction of the ICRF with the plasma edge became again a pressing issue. The talk aims at providing an overview of 50 years of ICRF research, thereby putting the progress of the ICRF scheme in an historical perspective. It shows what has been accomplished, how problems that surfaced have been overcome and develops a view for the future. [mehr]

Alpha channelling: status and perspectives

Institutskolloquium
  • Datum: 25.10.2019
  • Uhrzeit: 10:30 - 12:30
  • Vortragende(r): Prof. F. Romanelli
  • Francesco Romanelli has been the Leader from 2006 to 2014 of the Joint European Torus the largest magnetic fusion experiment in the world and the Leader of the European Fusion Development Agreement (EFDA), in charge of the coordination of physics and technology activities in the European fusion laboratories. In 2010 he has chaired the EIROforum partnership between the eight major European multi-governmental research organizations (CERN, ESA, ESO, EMBL, ILL, ESRF, XFEL and JET). He has directed the activities in Physics of Magnetic Confinement Fusion at ENEA Frascati from 1996 to 2006. From 2003 to 2006 he has been Chairman of the Science and Technology Advisory Committee of EFDA. He is presently Professor of Physics of Nuclear Energy at the University of Rome "Tor Vergata" and Research Director at ENEA.
  • Ort: Garching und Greifswald
  • Raum: Hörsaal D2 (Übertragung nach HGW S1)
  • Gastgeber: IPP
Alpha channelling is a mechanism to deposit the energy of the fusion-generated alpha particles directly into the bulk ion population through wave-particle interaction. Its interest is associated with the possibility of increasing the margin for high-gain operation of a burning plasma. The alpha-channelling mechanism relies on the interaction between the fusion alphas and a high-frequency wave (typically an ion Bernstein wave (IBW) obtained via mode conversion of a Fast Wave injected by an external antenna) that extracts the kinetic energy associated with perpendicular motion through a resonant interaction that breaks the magnetic moment. The crucial point is that diffusion in velocity and diffusion in space are tied together. Thus, the extraction of alpha particle energy by the IBW is associated with a radial displacement of the alpha particle towards the plasma edge. The present understanding of alpha channelling will be reviewed and the perspective for burning plasma applications will be discussed. [mehr]

Auf dem Weg zu einem integrierten Energiesystem – eine systemanalytische Betrachtung unter Einbeziehung aller Energieträger und Sektoren (Talk given in English)

Institutskolloquium
  • Datum: 15.11.2019
  • Uhrzeit: 10:30 - 12:00
  • Vortragende(r): Prof. Hans-Martin Henning
  • Prof. Dr. Hans-Martin Henning is Director of the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg, Germany and Professor of “Solar Energy Systems” at the Institute of Sustainable Systems Engineering in the Faculty of Engineering, University of Freiburg. He is member of acatech (German National Academy of Science and Engineering) and spokesperson of the Fraunhofer Energy Alliance. Prof. Dr. Henning obtained his PhD in physics at Oldenburg University in 1993. Since 1994, he has been working at Fraunhofer ISE in Freiburg, holding several different positions of responsibility over the years. In 2014 he was appointed Professor of Technical Energy Systems at the Karlsruhe Institute of Technology KIT and in 2017 Director of Fraunhofer ISE. The key areas of research of Prof. Dr. Hans-Martin Henning cover technical energy systems for buildings and energy system analysis. He plays a leading role in the development of computer models for the simulation and optimization of complex energy systems and their application to investigate the development of national/regional energy systems including all energy sources, energy conversion and storage technologies and energy end-use sectors.
  • Ort: Garching und Greifswald
  • Raum: Hörsaal D2 (Übertragung nach HGW S1)
  • Gastgeber: IPP
Die Warnsignale für eine notwendige drastische Reduktion der Emission klimaschädlicher Spurengase werden immer drängender. Die Transformation der weltweiten Energieversorgung spielt dabei eine Schlüsselrolle. Erneuerbare Energien werden bei diesem Umbau – neben einer höheren Effizienz bei der Wandlung und Nutzung von Energie – eine Schlüsselrolle spielen. Die wichtigsten Quellen erneuerbarer Energien sind Solarenergie und Windenergie – dies gilt global wie in Europa und Deutschland. Wie kann es gelingen eine Energieversorgung auf diesen volatilen, wetterabhängig verfügbaren Energiequellen aufzubauen? Im Vortrag wird am Beispiel der deutschen Energieversorgung versucht, diese Frage zu beantworten und zugleich wesentliche Herausforderungen zu benennen. Dabei erweist sich eine wachsende Sektorenkopplung als ein Schlüsselmerkmal. Hierunter wird eine zunehmende Nutzung von Strom in der Mobilität und für die Bereitstellung von Wärme in Gebäuden und Industrie verstanden – direkt oder indirekt in Form von mit erneuerbarem Strom hergestellter chemischer Energieträger. [mehr]
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