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DR. VOLKER SCHULZ-VON DER GATHEN & SEBASTIAN BURHENN AM GREMI
Dr. Volker 
Schulz-von der Gathen and Master student Sebastian Burhenn visited Prof. Dr. Remi Dussart at GREMI, Université d'Orléans from April 20th-23rd, 2015.
link to GREMI
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INTERNATIONAL CONFERENCE ON METALLURGICAL COATINGS AND THIN FILMS (ICMCTF)
The International Conference on Metallurgical Coatings and Thin Films (ICMCTF) is internationally recognized as the premier international conference focused on thin-film deposition, characterization, and advanced surface engineering. It brings together scientists, engineers, and technologists from academia, government laboratories, and industry, thereby merging cutting-edge research with real-world applications. The conference consistently draws more than 700 attendees each year within 37 oral technical sessions and a well-attended poster session.
It took part in San Diego from April 20th-24th, 2015. Postdoc Dr. Ante Hecimovic (Experimental Physics II) gave a presentation entitled "Plasma oscillations and ion transport in DC and HiPIMS magnetron discharges". He was also a session chair on a topical symposia "Plasma diagnostic and modelling". At the end, he has organised a round table disccusion on "Plasma diagnostic and modelling techniques for improved understanding of deposition process".
Prof. Dr. Peter Awakowicz and his PhD student Stefan Ries participated at ICMCTF as well.
link to conference website
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EP2
CEDRIC PATTYN
Cédric Pattyn from GREMI (Université d'Orléans) is doing an internship with Jun.-Prof. Dr. Jan Benedikt from the beginning of April until the end of September 2015 as part of his engineering studies. He is specialized in plasma engineering (part of his profile as a research engineer) and is working here on various atmospheric pressure plasma technologies for thin films, plasma medicine and plasma water treatment.
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TP4
PROF. DR. ABDULLAH AL MAMUN
The Alexander von Humboldt Foundation is repeatedly sponsoring the research stay of Prof. Dr. Abdullah Al Mamun from Jahangirnagar University - Department Physics in Savar, Dhaka, Bangladesh. He was already AvH Friedrich Bessel awardee in 2009.
He will be conducting research at the Institute of Theoretical Physics IV / Chair of Space and Astrophysics (Prof. Dr. Reinhard Schlickeiser) as a guest of Prof. Dr. Reinhard Schlickeiser from June 01 to August 31, 2015.
Prof. Mamun will give a talk on "Physics of Dusty Plasmas: Wave Phenomena" at the Physics Colloquium on June 22, 2015 (HNB, 12:15 pm). Interested parties are welcome to attend!
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ÉCOLE DE PHYSIQUE DES HOUCHES: FUNDAMENTALS OF AERODYNAMIC FLOW AND COMBUSTION CONTROL BY PLAMAS
Dr. Volker Schulz-von der Gathen (EP2, RUB) gives a talk about "Dynamics of the discharge evolution of micro discharge arrays" at the École de Physique des Houches in France (from April 12, 2015 to April 17, 2015).
This conference is the fifth of a cycle of conferences dedicated to the fundamental issues in the scientific disciplines relevant to aeronautics and space development. The previous editions of this workshop were held in Villa Monastero, Italy (2007), Les Houches (2009 & 2011) and Aussois (2013). The program will feature twenty invited lectures. Presentations will again address fundamental issues, experimental challenges, measurement methods and advanced numerical simulation.
The conference is managed by a team from the Paris region, with Svetlana Starikovskaia (Chairperson, Laboratoire de Physique des Plasmas, Ecole Polytechnique), Christophe Laux (vice-Chair, Ecole Centrale de Paris), Jean-Pierre Taran (local organisation, Onera) and a Steering Committee composed of leading scientists in the field.
The program of invited lectures can be found here.
link to website school
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TP4
PROF. ALEX LAZARIAN
Prof. Alex Lazarian from the University of Wisconsin-Madison (USA) is a guest at the Institute of Theoretical Physics IV / Chair of Space and Astrophysics (Prof. Dr. Reinhard Schlickeiser) from May 1 to 31, 2015. His stay is supported by AvH Foundation in the framework of network funding.
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TP4
DR. GIANFRANCO BRUNETTI
Dr. Gianfranco Brunetti is staying at our Institute of Theoretical Physics IV / Chair of Space and Astrophysics (Prof. Dr. Reinhard Schlickeiser) as a guest from 01.04.2015 to 31.07.2015. The Alexander von Humboldt Foundation has awarded him a research prize, the Friedrich Wilhelm Bessel Research Award. He comes from the Instituto Nazionale die Astrofisica (INAF) in Bologna, Italy. Another stay next year is planned.
Dr. Brunetti will study the acceleration of charged particles in galaxies and galaxy clusters to predict their observational radiation signatures from radio wave to gamma-ray regions.
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MOHAMED MOKHTAR HEFNY AND JUN.-PROF. DR. JAN BENEDIKT VISIT TO INSTITUTE OF PLASMA PHYSICS (IPP) IN CZECH REPUBLIC
PhD student Mohamed Mok
htar Hefny went to Prague from March 02, 2015 to March 20, 2015 with his supervisor Jun.-Prof. Dr. Jan Benedikt. He visited the group of Dr. Petr Lukes, Institute of Plasma Physics (IPP) in Czech Republic. This scientific mission was within the COST action "TD1208 Electrical discharges with liquids for future applications" and STSM Topic was "Chemical analysis of the reactive species produced in water treated by plasma produced radicals or VUV photons" and its Reference Number is "COST-STSM-ECOST-STSM-TD1208-020315-056481". They used the microscale atmospheric pressure plasma jet in treating water and analyzed the reactive species after treatment using ion and liquid chromatography and spectrophotometric. they used the micro-APPJ to generate a remote cold plasma at atmospheric pressure above the treated liquid in a He controlled atmosphere, they designed for that a small reactor with putting 3 ml of the prospective treated water inside it and making the plasma 4 mm above it. Treatment of water have done by many gas mixtures like He, He with O2 and He with N2 with and without water vapor. During the STSM they focused on the study of aqueous-phase chemistry of reactive oxygen species (ROS) and reactive nitrogen species (RNS) generated by plasma jet in the treated water. they made a lot of studies of H2O2, NO2-, NO3- synthesize in the treated water, they also studied the reaction pathways of phenol degradation induced by plasma in deionized water and used the phenol as a chemical probe.
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TET
PROF. DR. JULIAN SCHULZE
From March 23 to 27, Prof. Julian Schulze from West Virginia University, USA, visited the Chair of Theoretical Electrical Engineering at Ruhr-Universität Bochum. The focus was on the scientific exchange with the chairs AEPT and TET as well as the work with Sebastian Wilczek, PhD student, on the common research topic. The research cooperation between the two universities in the field of plasma technology will be further expanded and consolidated in the future. Prof. Schulze studied, received his doctorate and habilitated at the Ruhr-Universität Bochum. As a promising young scientist in the field of low-temperature plasma physics, he was already awarded the Hans Werner Osthoff Plasma Physics Prize in 2012.
The scope and outstanding quality of his work in the few years from physics diploma to doctorate to habilitand at the Institute of Experimental Physics V of the RUB was impressive. His experiments have significantly advanced the understanding of the physics of high-frequency discharges. After a short period as a post-doc at the Hungarian Academy of Sciences, he is now Assistant Professor at West Virginia University and is considered a world-renowned expert in the field of RF plasmas. Together with Sebastian Wilczek, Prof. Schulze studies the heating/dynamics of electrons in low pressure capacitive discharges. This heating mechanism has a crucial influence on the plasma composition and needs to be understood in order to control industrial coating and etching processes much better. Based on previous collaborations, an article on the confinement quality of high-energy beam electrons was published in March 2015. The collaboration will continue in the future. In the summer semester, Prof. Schulze offers a block seminar over five days for students and interested parties. With his visit to the RUB, further interesting topics in plasma technology were discussed and investigated. Joint publications are planned.
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TP4
DR. ILAN ROTH
From April 28-30, 2015, Dr. Ilan Roth from Space Sciences UC Berkeley, University of California, USA will be a guest of Prof. Dr. Reinhard Schlickeiser (Theoretical Physics IV). As part of the seminar "Space and Astrophysics" he will give a talk on "Knotty Invariants: Structure & Evolution of Magnetized Fluids" on 4/29 at 10:15 am (NB 7/67) and on "Solar/Planetary/Galactic Relativistic Electrons: Common Denominator?" on 4/30 at 10:15 am (NB 7/67). Interested parties are welcome!
ABSTRACT "KNOTTY INVARIANTS: STRUCTURE & EVOLUTION OF MAGNETIZED FLUIDS"
Magnetic fields in the laboratory and in space are generally depicted as closed loops or curves anchored at physical foot-points, both deformed through a set of stretching and bending procedures. This classification allows one to describe most of the magnetic configurations in fusion research, in magnetic confinement and in astrophysical environments as 2D curves modified by slide, poke or twist.
However, dynamically evolving 3D magnetic structures may form loops which cannot be transformed to an equivalent closed (anchored) two-dimensional curve. Hence, the resulting curves' characterization may be generalized through their unique topology. The analogy between MHD and knot theory offers a new classification of magnetic flux tubes. Ideal MHD fluid describes non self-intersecting loops with smooth stretching and bending in the viscous surrounding fluid, identically to mathematical knots. The crossings of a 3D structure projection are assigned mathematical operations resulting in new invariants which are preserved under stretching and bending, forming robust entities. We conjecture that the field which emerges from the solar photosphere appears in the form of a prime knots, knots which cannot be composed from two nontrivial knots. Observations of intermittent ion flux drops in impulsive solar flares can be attributed to the formation of the simplest knotty structures – torus knots. Similarly, accumulation of small-scale localized spatial structures seen in simulations and inferred experimentally in the cascading solar wind plasma can be related to the stability of the 3D knots. Implications for dynamo processes and decay and for stability of complex magnetic configurations due to preservation of topological invariants are suggested.
ABSTRACT "SOLAR/PLANETARY/GALACTIC RELATIVISTIC ELECTRONS: COMMON DENOMINATOR?"
Observations of electron distribution functions with sub or super relativistic tail or power law(s) at high energies and with elongated tails are common in space plasmas. These distributions are measured in situ or deduced remotely in various magnetized environments. The in situ measurements relate to enhanced fluxes of relativistic electrons principally (i) in the terrestrial outer radiation belts and (ii) at the interplanetary medium at heliospheric distances of 1 AU with related solar observations, or (iii) remotely at galactic distances through various radiation emissions. Due to the similarity between the observations at the relativistic radiation belts and solar electrons it is suggested that a specific bootstrap mechanism to relativistic electrons operates at these environments. Several possible solutions to previously ignored aspects of the mechanism will be offered. New mathematical description for the formation of an energetic distribution function tail will be described.
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EP5
PROF. DR. YI-KANG PU
Prof. Dr. Yi-Kang Pu from the Department of Engineering Physics at Tsinghua University (China) will be a guest of Prof. Dr. Uwe Czarnetzki (EP5) from April 4-9, 2015.