Raum: Hörsaal D2 (Übertragung nach HGW S1)

Kolloquium zum Abschluss des ECRH1 Betriebs

Institutskolloquium
"Planung, Aufbau und Betrieb der ersten ECRH - Anlage an ASDEX Upgrade " Fritz Leuterer "Electron heat transport studies with ECRH1: stiffness and critical gradient" Francois Ryter "Control of MHD instabilities by ECRH on ASDEX Upgrade" Hartmut Zohm "Co-existence of ECRH1 and ECRH2: W accumulation and high power experiments" Jörg Stober [mehr]

Direct observation of gravitational waves from the merger and inspiral of two black holes

Institutskolloquium
This talk follows the annoucement made on February 11th by the LIGO Scientific Collaboration. On September 14, 2015, we detected the gravitational waves emitted by the final few orbits and merger of two black holes. In this talk, I present the main results, as well as some of the "behind the scenes" details of the discovery and subsequent analysis. Reference: P. Abbott et al., Phys. Rev. Lett. 116, 061102, 2016. [mehr]

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]

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]

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]

Homo Oeconomicus or Homo Reciprocans?

Institutskolloquium
The last Nobel Prize in economics was awarded to Richard Thaler for his contributions to Behavioral Economics. Behavioral Economics challenges the standard, neoclassical assumption that economic decision makers are fully rational and only concerned about their own material well-being. Over the last decades new models of human behavior have been developed, often inspired and tested by fascinating economic experiments. In this lecture I will focus on "social preferences", a subfield of behavioral economics to which Thaler and many other economists and psychologists contributed. It seems obvious that many people are not only motivated by their own material well-being but often care about other people. Altruism, spite, inequality aversion, concerns for fairness and reciprocal behavior have an important impact on economic decision making. However, it is often difficult to disentangle the exact motivations that are driving economic behavior. In this lecture I will give a brief introduction into this field and discuss some recent experiments on the dark side of social preferences. [mehr]

Gas, glass & light: 25+ years of photonic crystal fibres

Institutskolloquium
The idea for a new kind of optical glass fibre—photonic crystal fibre (PCF)—first emerged in 1991. The aim was to realise a fibre with a two-dimensional periodic array of microscopic features (typically hollow channels) running along its entire length. These would be able to corral light within a central hollow or solid core, permitting light and matter waves to be tightly confined over long distances while precisely controlling the dispersion. More than a quarter of a century later, PCF has led to a whole series of new developments, some of which are already are moving into real-world applications. Solid-core PCFs are routinely used to transform invisible infrared laser pulses into white light 10 million times brighter than an arc lamp, and form the basis of commercial supercontinuum sources. Twisted PCF creates optical vortices that carry orbital angular momentum, as well as providing an elegant means of providing circular birefringence and dichroism. Intense interactions between light and sound in solid-core PCF enable stable all-optical mode-locking of fibre lasers at a high harmonic (a few GHz) of their round-trip frequency. Single-ring hollow-core PCF, comprising a ring of thin-walled capillaries surrounding a central hollow core, guides over an extremely wide frequency range and, through pressure-adjustable dispersion, provides a simple means of compressing pulses down to single-cycle durations, as well as underpinning a range of unique and extremely bright sources of tunable deep and vacuum ultraviolet light. [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]

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]

Jahreshauptversammlung 2018 Sozialwerk

[mehr]

Quantum Logic Spectroscopy of Trapped Ions

Institutskolloquium
Precision spectroscopy is a driving force for the development of our physical understanding. However, only few atomic and molecular systems of interest have been accessible for precision spectroscopy in the past, since they miss a suitable transition for laser cooling and internal state detection. This restriction can be overcome in trapped ions through quantum logic spectroscopy. Coherent laser manipulation originally developed in the context of quantum information processing with trapped ions allows us to combine the special spectroscopic properties of one ion species (spectroscopy ion) with the excellent control over another species (logic or cooling ion). The logic ion provides sympathetic cooling and is used to control and read out the internal state of the spectroscopy ion. In my presentation I will provide an overview of different implementations of quantum logic spectroscopy suitable for narrow (long-lived) and broad (dipole-allowed) transitions. Applications range from highly accurate optical clocks based on aluminium ions, over precision spectroscopy of broad and non-closed transitions in calcium isotopes, to non-destructive internal state detection and spectroscopy of molecular ions. Prospects to extend quantum logic spectroscopy to highly charged ions and first steps towards this goal will be discussed.Spectroscopy of these species enables a multitude of tests for physics beyond the Standard Model, such as probing for new force carriers and scalar fields that are dark matter candidates and could induce a variation of fundamental constants. Measurements of isotope shifts of narrow transitions in calcium isotopes probes nuclear structure and may allow to constrain new forces coupling electrons and neutrons. Precision spectroscopy of e.g. vibrational transitions in molecular ions will allow to put bounds on a possible variation of the electron-to-proton mass ratio, while highly charged ions are among the most sensitive systems to probe for a variation of the fine-structure constant.Picture: Sympathetically cooled highly-charged ions. Left: Ar13+ in a cloud of laser-cooled Be+ ions. Right: Two Be+ ions separated by a single Ar13+ ion. [mehr]

Exploring Turbulence in Fusion Plasmas through Experiment and Simulation

Institutskolloquium
A profound understanding of turbulence in fusion plasmas is paramount because of its strong impact on both core and edge plasma transport. Turbulence is a key player in determining particle, energy, and momentum fluxes and thus dictates the shape of the density, temperature, and rotation profiles, which set the the efficiency of a fusion reactor. Gyrokinetic theory is considered nowadays to be the state of the art when it comes to a compromise between realism and efficiency, but must be validated to improve the reliability of predicting profiles for future fusion devices. The fundamentals of turbulence, its generation and its characterization with both measurements and simulations will be presented. For the core plasma, particular attention is paid to the comparison between measurements and gyrokinetic simulations, which has led to significant gains in understanding. The edge turbulence behavior in different confinement regimes is contrasted. Strong turbulence is usually observed in the L-mode edge while the H-mode edge plasma exhibits a reduced turbulence level. In yet another confinement regime, the improved energy confinement mode (I-mode), edge turbulence is reduced to a large degree. However, strongly intermittent high amplitude events are observed. An analytic candidate generation mechanisms is presented and first results from accompanying gyrokinetic simulations of the I-mode edge – consistent with the observations – are reported. [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]

An introduction to Open Science: doing transparent, credible and efficient research

The replicability of research findings is a core criterion of science. However, in recent years, large replication projects in psychology, medicine, economics, and other disciplines, have revealed that only 20-40% of all findings can be replicated. [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]

Informationsveranstalung zum Thema eRechnung

Liebe Kolleginnen und Kollegen, zu den Maßnahmen im Rahmen der Modernisierung der Verwaltung gehört die Einführung der elektronischen Rechnungsverarbeitung. Hierzu wurde am IPP eine Projektgruppe eingerichtet, die einige Vorarbeiten dazu geleistet hat. Unter anderem haben Sie hierzu schon erfahren, dass eine E-Mail Adresse eingerichtet wurde, die zentral für das IPP die Zusendung von elektronischen Rechnungen über die MPG zwingend vorsieht. Mit der Informationsveranstaltung möchten wir frühzeitig einen größeren Mitarbeiterkreis am IPP darüber informieren, um was es in diesem Projekt geht, welche Ziele und welche offenen Fragen für die weitere Umsetzung damit verbunden sind. Ziel der Veranstaltung ist es, das Thema transparent zu machen bzw. Sie dafür zu sensibilisieren, weil die anstehenden möglichen Änderungen die Mitarbeiter des IPP unterschiedlich je nach Aufgabengebiet betreffen können. Selbstverständlich werden wir auch für Fragen der Kolleginnen und Kollegen zur Verfügung stehen. Wir empfehlen die Teilnahme für Mitarbeiter aus dem Verwaltungs- und Infrastrukturbereich. Ebenso wäre es sinnvoll, wenn Kolleginnen und Kollegen aus den wissenschaftlichen Bereichen für das zugegebener Maßen sehr verwaltungslastige Thema Interesse und Zeit fänden. [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]

Sozialwerk Mitgliederversammlung

Die Tagesordnung finden Sie auf unserer Intranetseite unter dem Link: Agenda, unten links. Sollte Ihnen der Zugriff nicht möglich sein, antworten Sie bitte formlos auf dieses Schreiben und ändern Sie den Betreff auf "Agenda"; Sie erhalten diese dann per E-Mail. Des Weiteren laden wir Sie herzlich ein, an unserem Grillfest anlässlich unseres 50 Jubiläums teilzunehmen. Damit wir besser planen können, freuen wir uns über Ihre Anmeldungen bis zum 13. September 2019 unter sozialwerk@ipp.mpg.de (Betreff: Grillfest). Da es sich um eine Einladung handelt, ist die Teilnahme kostenfrei. Das Sozialwerk freut sich aber sehr, wenn Sie das bereitgestellte Schwein „füttern“. [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]

The Career Center for Postdocs at IPP: Structure, Status, Plans

Institutskolloquium
[mehr]

Gesundheitstag am IPP

Thema des Vortrags: Entspannung und Stressbewältigung [mehr]

Zeigt uns Star Trek die Energieversorgung der Zukunft?

Institutskolloquium
Wenn das Raumschiff Enterprise zu fremden Planeten reist, benötigt es dafür eine exorbitante Menge an Energie. Wie wird diese Energie erzeugt bzw. gespeichert? Wie funktionieren die Fusionsreaktoren und der Warp-Reaktor an Bord der Enterprise und wie der Impuls- und der Warp-Antrieb? Welche Visionen hatten die Star Trek-Autoren bzgl. der Energieversorgung von Kleingeräte wie Tricorder, Phaser oder dem Kommunikator? Ein Vergleich zu heutigen Technologien macht deutlich, dass wir noch weit von den Möglichkeiten der Energiespeicherung, wie sie bei Star Trek gezeigt wird, entfernt sind. [mehr]
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