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  mbi-berlin.de  
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Extrapoliert man unsere Erkenntnisse in den Parameterbereich für ein richtiges Kollisionsexperiment mit schnellen schweren Ionen, werden Femtosekundenlaser mit Pulsenergien von 100 J benötigt.
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Extrapolation of our results envisions the study of nuclear processes if heavy ions with adequate kinetic energies will be produced by using femtosecond lasers with 100 Joule pulse energy.
  2 Hits www.hotellesoleil.it  
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Neuere Forschungen zur Optimierung von Tragstrukturen aus Hohlprofilen wurden mit um 45° um die Stabachse gedrehten RHS-Profilen (Rectangular Hollow Section) durchgeführt. Diese so genannten Diamond Bird Beak joints (DBB) zeigen für den untersuchten Parameterbereich wesentlich größere Tragfähigkeiten als konventionelle Knotenverbindungen mit RHS-Profilen.
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Newer/recent researches for optimization of hollow profile carrying structures were made with RHS profiles (Rectangular Hollow Section), which are rotated 45° to the (bar) axis. These so called Diamond Bird Break joints (DBB) show significantly increased carrying capacities in the examined parameter-range than conventional joints with RHS profiles.
  www.aei.mpg.de  
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Holger Pletsch übertrug die ursprünglich für die Gravitationswellen-Datenanalyse entwickelten Methoden auf die Suche nach unbekannten Gammapulsaren. Mit diesen verbesserten, effizienteren Verfahren ließ sich erstmals ein größerer Parameterbereich mit höherer Empfindlichkeit als bislang untersuchen.
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Optimizing this kind of search to make the best use of the computer power is one subject of Holger Pletsch's research. The newly-developed data analysis methods extend the spatial volume to which the search is sensitive by a factor of about 200. The probability of detecting gravitational waves from rapidly rotating neutron stars is increased by the same factor. This significantly increases the hope of making the first direct measurement of gravitational waves.
  sdpuo.com  
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Im Rahmen des Projektes MOMOS sollen Teilentladungsphänomene, die an Betriebsmitteln in Stromnetzen auftreten, mithilfe eines multiphysikalischen Ansatzes analysiert werden. Dabei fließen in hohem Maße die Erkenntnisse und Erfahrungen aus der Plasmatechnologie ein, die sich unter anderem mit Gasentladungen im ähnlichen Parameterbereich beschäftigen.
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As part of the MOMOS project, partial discharge phenomena occurring in equipment in electricity grids shall be analysed using a multiphysics approach. This shall also extensively incorporate the knowledge and experience gained from plasma technology, which among other things is concerned with gas discharges in a similar parameter range. It is intended that the method can be used both during operation and when the equipment is switched off. The project manager is Dr Sergey Gorchakov.
  www.astria-audit.fr  
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Im Rahmen des BMBF Verbundvorhabens „MOMOS“ („Multiphysics Online/Offline Monitoring System - MOMOS") werden mithilfe eines Ansatzes, der physikalische und ingenieur-technische Expertise vereint, Teilentladungsphänomene analysiert, welche an Betriebsmitteln von Stromnetzen auftreten. Dabei fließen Erkenntnisse und Erfahrungen aus der Plasmatechnologie ein, die sich z.T. mit Gasentladungen im ähnlichen Parameterbereich beschäftigen.
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For the determination of plasma parameters, like e.g. temperature and composition, combination of complementary OES methods, like e.g. analysis of atomic and ionic line radiation is applied as a general solution approach, allowing for the study of broader spatial regions and extended temporal ranges. High-speed camera based tomographic reconstruction is applied for the measurements on non-symmetric arcs. Absorption spectroscopy using appropriate light sources is a suitable method for study of colder plasma regions and arc surrounding gas.
  3 Hits www.uni-muenster.de  
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Die Vielfalt an unterschiedlichen Mustern konnten wir auf die Existenz von Moden mit unterschiedlichen Wellenzahlen aber ähnlichen Wachstumsraten zurückführen[9]. Wieso jedoch solche Moden nur in diesem Parameterbereich auftreten, ist eine offene Frage und Gegenstand aktueller Untersuchungen.
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We investigate self-organized pattern formation in a single-mirror feedback experiment [8]. The first pump beam is directly obtained from the laser source and focused into the photorefractive crystal. The second beam is created by reflecting the original pump beam off the external mirror. Diffraction of the beam propagating to the mirror and back is responsible for the spatial coupling neccessary for the generation of transverse patterns.
  3 Hits autrans-meaudre.com  
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Dazu wird die materialwissenschaftliche und technologische Expertise zur Herstellung optischer Spezialfasern in einem weiten Parameterbereich mit den wissenschaftlichen Kompetenzen zur Charakterisierung und Applikation von faseroptischen Komponenten und Systemen vereint, wobei das Institut eine besondere internationale Stärke durch die Abdeckung der geschlossenen Kette von der Materialpräparation, über die Faserpreformentwicklung, die Faserherstellung, Faserfunktionalisierung und Faserintegration bis zur Fasersystemanwendung besitzt.
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In the fiber optics research focus fundamental studies are performed on the propagation characteristics and the efficient and flexible control of fiber-guided light as well as on fiber modules and fiber systems for a wide application range. This research focus combines the scientific competence of the modeling, characterization, and application of fiber-optic components and systems with the material science and technological competence of the manufacture of special optical fibers in a wide parameter range. On an international level, the Institute is particularly strong by maintaining a closed chain of production – from material preparation to the development of fiber preforms as well as to the manufacture, functionalizing, and integration of fibers, and to fiber system application.
  www.maschinenbau.rwth-aachen.de  
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Im Hinblick auf eine fortschrittliche Werkstoffmodellierung verfügt das Institut über ein modernes Materialprüflabor, z.B. zur Ermittlung von isothermen Kalt- und Warmfließkurven bei konstanter Umformgeschwindigkeit im Parameterbereich von T = 20 - 1250°C und dφ/dt = 10-4 - 500 s-1. Daneben ermöglichen die Einrichtungen die Bestimmung der Kinetiken von Rekristallisation, Erholung und Kornwachstum sowie der Randbedingungen (Reibung, Wärmeübergang, Strahlung) und die physikalische Simulation mehrstufiger Prozesse.
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Regarding material modeling the institute relies on a modern material testing laboratory. For example, the determination of isothermal cold and hot flow curves with a constant strain rate is possible. Furthermore, the facilities provide the identification of kinetics of recrystallization, recovery and grain growth as well as boundary conditions (friction, heat transfer, radiation) and the physical simulation of forming processes in several steps. These experimental potentials are the basis for the development and FEA implementation of sophisticated microstructure models during and after hot forming, based on phenomenological and metal physical approaches.
  www.armagnac-castarede.fr  
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„Die Längenskala der Filamentation ist größer als die Längen, auf denen es zur Kompression des Laserpulses kommt. Wir können daher einen Parameterbereich finden, in dem der Laserpuls zwar komprimiert wird, aber der störende Filamentations-Effekt noch ausbleibt.“
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The Viennese research group, in collaboration with researchers from Moscow state university, has now identified conditions which lead to self-compression and an extremely high peak power without causing the beam to collapse into filaments. “As it turns out, we are dealing with two different length scales”, says Valentina Shumakova. “The length scale of the unwanted filamentation is longer than the length on which self-compression occurs. Therefore, it is possible to find a parameter regime in which the pulse is compressed but filamentation does not yet set in.” The power of the lase pulse is 10,000 times higher than the filamentation threshold – and still it does not collapse.
  www.aapharma.ca  
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Am HI Jena stehen mit JETi200 und POLARIS zwei Lasersysteme für Experimente zur Verfügung, mit denen die laser-getriebene Elektronenbeschleunigung (laser wakefield acceleration) in einem weiten Parameterbereich untersucht wird.
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Located at the Helmholtz Institute Jena are two laser systems, JETi200 and POLARIS, with which the Laser Wakefield Acceleration (LWFA) mechanism can be investigated. While both lasers currently operate at peak powers near 200 TW, their differing pulse parameters (e.g., duration and energy) allow LWFA experiments to be explored in different regimes. The JETi200’s 17 fs pulse duration and 4 J energy on target are well suited for reaching the “bubble”-regime of LWFA, where a strongly non-linear plasma wave is driven which subsequently accelerates electrons to “modest” kinetic energies of several hundred MeV to a few GeV. In comparison, POLARIS’ longer pulse duration of just under 100 fs, and higher pulse energy of 17 J will enable electron bunches to be accelerated to several GeV of kinetic energy. Empirically, the generation of electron bunches with several GeV kinetic energies has relied on coupling the laser pulses into a wave guiding structure; in this case, a capillary made from sapphire is used. By filling the capillary with hydrogen gas and discharging a high-voltage through the capillary, the hydrogen gas is ionized and plasma is formed. Plasma heating at the nanosecond timescale then creates a parabolic density profile of the plasma, and with properly selected system parameters the natural diffraction of the focused laser beam is suppressed in the plasma-based wave guide allowing the laser pulse to propagate over centimeter-long distances without significant changes in its focal spot size. This guiding of the laser pulse allows the laser’s intensity to remain high over longer distances, so that the plasma wave, central to LWFA, can accelerate electron bunches to even higher kinetic energies.