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AEPT
PROF. DR. SAMUEL GRAHAM
Prof. Dr. Samuel Graham from the Georgia Institute of Technology, Atlanta (USA) will visit the RD Plasma and the SFB-TR87 on June 24, 2013.
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TP1
PROF. DR. GWANGSON CHOE
On Thursday, June 20th,2013, Prof. Dr. Gwangson Choe from the School of Space Research, Kyung Hee University, Yongin, Korea, gives a talk at 11.00 am in room NB 7/67 about "Structural Growth of Coronal Magnetic Flux Systems and Solar Eruption". He stays at RUB as a guest of FOR1048.
Abstract: Erupting magnetic structures seen in coronal mass ejections are of grand scales. There have been speculations that such structures are formed in the solar interior before their emergence out of the solar surface. However, the structures observed to emerge into the solar photosphere are usually of a much smaller scale than the coronal structures observed before eruption. In this talk, I will illuminate the evolution of a group of small scale flux tubes into stepwisely larger scale flux systems while magnetic helicity is continuously injected into the corona. As magnetic helicity increases, individual flux tubes expand and reconnect with each other to create new field line connections between magnetic patches separated farther than the footpoint distance of the original connection. Thus created are new flux systems of larger scales, which are entwined with mutual magnetic helicity. When the system reaches a critical state, in which it can no more increase the footpoint distances by magnetic reconnection, the system must eject excessive magnetic helicity and energy away from the boundary. This process arises as an eruptive phenomenon in the solar corona. A relevant observation will also be presented and compared with the simulation.
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EP5
PROF. DR. UWE KORTSHAGEN
On June 17, 2013, Prof. Dr. Uwe Kortshagen from the University of Minnesota, USA, will give a talk on "Silicon Quantum Dots: At the Intersect of Plasmas, Semiconductors, and Device Engineering" (Introduction: Prof. Dr. Uwe Czarnetzki). The talk will have been held at HNB starting at 12:15 pm as part of the Physics Colloquium. Interested parties are cordially invited!
Prof. Kortshagen is Distinguished McKnight University Professor and Department Head at the Department Mechanical Engineering and leads the.
ABSTRACT: Quantum confined nanocrystals, also called quantum dots, are attractive building blocks for opto-electronic devices owing to their size-dependent optical and electronic properties. While chalcogenide semiconductor quantum dots can conveniently be synthesized with liquid phase reactions, there are concerns about the abundance of their constituent elements and their toxicity.
Covalently bonded group IV semiconductors such as silicon are both abundant and nontoxic but require approaches that provide higher synthesis temperatures. Nonthermal plasmas have emerged as the synthesis route of choice for silicon and other group IV materials, since they provide high temperatures, narrow particle size distributions, and the ability to tailor the quantum dot surface properties with a great level of control.
This presentation will discuss the synthesis of quantum confined silicon nanocrystals with a capacitively coupled low-pressure plasma approach, which enables the production of macroscopic quantities of material with excellent control over quantum dot size and crystallinity. This synthesis scheme also enables one to selectively attach surface groups to the silicon quantum dots, which allow for optical quantum yields in photo- and electro-luminescence which are unprecedented for indirect bandgap semiconductors. Finally, the presentation will focus on how the efficient light emitting properties of silicon quantum dots can be utilized in highefficiency hybrid organic/nanocrystal light emitting devices.
This work was supported by the National Science Foundation (NSF) MRSEC Program under award number DMR-0819885, NSF award ECCS-0925624, and the Center for Advanced Solar Photophysics, a Department of Energy funded Energy Frontier Research Center.
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4TH WORKSHOP ON RADIO FREQUENCY DISCHARGES, FRANCE 2013
The RF-Workshop took place in La Presqu’ile de Giens on the French Riviera, near the city of Toulon. from May 29th-31st, 2013. The village-club “La badine” hosted the technical sessions with about 45 participants. Prof. Dr. Uwe Czarnetzki and Dr. Volker-Schulz von der Gathen represented the Research Unit "Physics of Microplasmas" FOR1123 and the Research Department "Plasmas with Complex Interactions".
The 5th RF-Workshop will take place in Dublin in 2015.
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EMRS STRASSBOURG 2013
The Research Department Plasmas with Complex Interactions was represented in the E-MRS 2013 Spring meeting in Strasbourg (May 27-31, 2013) by Dr. Carles Corbella (Ion induced oxidation of aluminium during reactive magnetron sputtering) and Dr. Teresa de los Arcos (Target implantation and redeposition processes during HPPMS of aluminium). Both contributions were presented within the “protective Coatings and Thin Films’13” Symposium. The contribution of Dr. de los Arcos was presented in a special HiPIMS session supported by the COST Action MP 0804.
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TP1
PROF. RICHARD SYDORA
Prof. Dr. Richard Sydora from the University of Alberta, Edmonton is again a guest in Bochum from 3 to 14.6.2013. Within the framework of the Research Group 1048 and the Research Department "Plasmas with Complex Interactions" he is modeling together with the Bochum plasma physicists the dynamics of the magnetic structures produced in the FlareLab experiment and the particle acceleration occurring in the process. Both aspects are crucial for the occurrence and the effects of solar mass ejections and are modeled in Bochum in laboratory experiments and by means of large-scale computer simulations.
Prof. Sydora will give a talk on 6/13 at 16:00 in NB 7/173 with the topic "Modeling Ion-Acoustic Turbulence and Particle Acceleration in the FlareLab Experiment." Interested parties are welcome to attend!
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7TH INTERNATIONAL WORKSHOP ON MICROPLASMAS 2013
The 7th International Workshop on Microplasmas took place from from Monday, May 20th to Thursday, May 23rd, 2013 in the Fragrant Hill Hotel near Bejing, China. This workshop was the seventh in a series that started in Japan in 2003 and has since alternated between venues in Asia, the USA and Europe.
The intent of the workshop is to bring together researchers from around the world to report on recent progress in understanding and in controlling the properties of plasmas generated in confined geometries.
The Research Department "Plasmas with Complex Interactions" and thus the Research Unit "Physics of Microplasmas" FOR1123 was represented by Jan Benedikt, Marc Böke, Denis Eremin, Dirk Luggenhölscher, Daniel Schröder, Achim von Keudell, and Jörg Winter.
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TP4
GUESTS FROM ANKARA
From May 17-21, 2013, Seydi Yavas, Burak Eldeniz and Sinem Yilmaz (pictured from left to right) from the Ultrafast Optics & Lasers Laboratory (UFOLAB) at Bilkent University in Ankara, Turkey, visited the Institute of Experimental Physics II to work on the laser with PhD student Stefan Spiekermeier. They installed the temperature-stabilized oscillator for the femtosecond laser.
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EP2
PROF. DR. LAWRENCE J. OVERZET
Prof. Dr. Lawrence J. Overzet from UT Dallas will be a guest of Dr. Volker Schulz-von der Gathen and Judith Golda from May 13-16, 2013 as part of the research group FOR1123 "Physics of Microplasmas".
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INTERNATIONAL CONFERENCE ON METALLURGICAL COATINGS AND THIN FILMS (ICMCTF) 2013
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 32 oral technical sessions and a well-attended poster session.
2013, the conference took place from April 29 - May 3, 2013. Dr. Ante Hecimovic represented the Research Department "Plasmas with Complex Interactions" and gave an oral presentation entitled “The characteristic shape of emission profiles of plasma spokes in HiPIMS: the role of secondary electrons”. The presentation focused on the latest findings related to the plasma inhomogeneities observed in high power impulse magnetron sputtering (HiPIMS/HPPMS) discharge. Based on the experimental data and modelling of the discharge a model explaining the physical mechanism behind the plasma inhomogeneities has been presented.
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10TH FRONTIERS IN LOW TEMPERATURE PLASMA DIAGNOSTICS (FLTPD)
The 10th Frontiers in Low Temperature Plasma Diagnostics was held from April 28th—May 2nd, 2013 at the Conference Centre Rolduc in Kerkrade, the Netherlands. PhD student Stefan Spiekermeier from the Research Unit "Physics of Microplasmas" FOR1123 participated in that conference.
The Frontiers in Low Temperature Plasma Diagnostics (FLTPD) brings together experts in the field of low temperature plasma diagnostics and create the possibility to share knowledge of these diagnostics with the new generation of scientists.
The 10th FLTPD is the continuation of a very successful biennial series that began in 1995 at Les Houches (France) and is organized by the Eindhoven University of Technology (TU/e) and the Dutch Institute for Fundamental Energy Research (DIFFER).