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Workshop Young Professionals in Microplasma Research
From Nov. 24-26th, 2014 the Research Unit FOR1123 "Physics of Microplasmas" will host the first Workshop for young professionals in Microplasma Research at the Ruhr-Universität Bochum.
http://www.for1123.rub.de/index.php?option=com_content&view=article&id=167:young-professional-workshop&catid=1:aktuelle-nachrichten&Itemid=101
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AEPT
DR. ENRIQUE IGLESIAS
Dr. Enrique Iglesias from the Universidad Simón Bolívar, Caracas, Venezuela is currently a guest at the Chair AEPT. He will give lectures on three Thursdays (11/27, 12/4 and 12/11/2014) from 10:00-12:00 (ID/04/653).
1) Do, 27.11.2014: Spectroscopy Relevant Topics For In Situ Measurement Of The VUV Radiation Produced In A Microwave Plasma Discharge - We will discuss in detail an experimental procedure, which is based upon recording the fluorescence light emitted by sodium salicylate disks placed at the target position. Basic spectroscopy issues on visible and VUV spectroscopy will be addressed. Preliminary results wil be presented.
2) Do, 4.12.2014: From Photon Density Rate Emitted In The Plasma To Radiant Flux At The Target Surface. A Primer In Radiative Transfer - We will discuss basic concepts of radiative transfer in a plasma, and we will apply them to the interpretation of our VUV measurement. We will also address the basics of absorption spectroscopy using monochromatic beams.
3) Do, 11.12.2014: The Relative And Absolute Calibration Procedure For A VUV And Echelle Spectrometers Using The Techniques That Are Regularly Applied At The AEPT Institute - We will outline the general basic issues of the relative calibration of a modern compact visible spectrometer. We will discuss the relative calibration procedure of a VUV and echelle spectrometers. A basic technique of absolute calibration of an echelle spectrometer will be presented also.
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TP4
PROF. DR. FELIX SPANIER
Prof. Dr. Felix Spanier from North-West University, Potchefstroom, Southafrica, is a guest of Prof. Dr. Reinhard Schlickeiser (TP IV) and will give a talk on "Emission mechanisms in AGN - a non-linear puzzle" in the seminar "Space and Astrophysics" on 09.12.2014 at 14:15 in NB 7/67. Interested parties are welcome to attend!
Abstract: Active Galactiv Nuclei are nowadays one of the most interesting objects of extragalactic astronomy. Their wideband spectrum and their extreme properties - in terms of energy as well as in terms of variability - can be studied with recent experiments like HESS and Fermi. Although the amount of observational data is increasing rapidly, we do not yet understand the intrinsic mechanics of these objects. While there is consensus that AGN host populations of nonthermal particles, it is neither clear whether these are only leptons or also protons nor is it clear, which emission mechanism plays a role.
In my talk I want to outline the problems in understanding the emission mechanisms. One of the major problems is the nonlinear coupling of different processes, which effectively prevents a simple linear analysis and a mapping of observational spectra and internal parameters. I will present different approaches of modeling AGN, their predictions and their pitfalls.
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WELTPP-17
The 17th Workshop on the Exploration of Low Temperature Plasma Physics (WELTPP-17) will be held ion November 20th-21st, 2014 at the old convent Rolduc in Kerkrade. This workshop is intended for active scientists working in the field of low temperature plasma physics.
http://www.phys.tue.nl/PMP/WELTPP/contact.php
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TP4
DR. IOANNIS KOURAKIS
Dr. Ioannis Kourakis from Queens University Belfast, Northern Ireland is a guest of Prof. Dr. Reinhard Schlickeiser and will give a talk on "Rogue Waves in Electromagnetic Beam-Plasma Interactions: modeling and phenomenology" on Wednesday, 26.11.2014 starting at 10:15 am in NB 7/67 as part of the seminar "Space and Astrophysics". Interested parties are welcome to attend!
Abstract: Extreme events in the form of rogue waves (freak waves) occur widely in the open sea. These are space‐and time‐localised excitations, which appear unexpectedly and are characterised by significant amplitude (exceeding 2.5 times the average turbulence level in their environment). Beyond ocean dynamics, the mechanisms underlying rogue wave formation are now being investigated in various physical contexts, including materials science, nonlinear optics and plasma physics , to mention but a few.
Inspired by the ubiquity of this challenging phenomenon, we have undertaken an investigation, from first principles, of the occurrence of rogue waves associated with the propagation of an electromagnetic pulse in a plasma. A multiscale technique is employed to solve the fluid‐Maxwell equations describing a weakly nonlinear circularly polarized electromagnetic pulses in collisional magnetized plasmas. A nonlinear Schrodinger (NLS) type equation is shown to govern the amplitude of the vector potential. A brief review of existing theories based on non‐stationary envelope solutions of the NLS equation is presented (Peregrine soliton, Akhmediev breather, Kuznetzov‐Ma breather), and the variation of their structural properties with the magnetic field is investigated. Recent advances on numerical investigations of the occurrence of rogue waves in plasmas are presented and discussed.
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PATRICK BÖHM AN DER OHIO STATE UNIVERSITY, COLUMBUS, OHIO, USA
Patrick Böhm visited the non-equlibrium thermodynamics laboratory (NET-Lab) research group at the Department of Mechanical and Aerospace Engineering (MAE) at the Ohio State University (OSU) from August 8th to November 11th 2014. The group is supervised by Prof. Igor Adamovich and Prof. Walter
Lempert. A four wave mixing technique to measure electric fields in hydrogen similar to the one applied in project A3 of FOR1123 was applied. During this stay a new fast ionization wave discharge setup was developed in which electric field measurements were conducted. This measurements had
sub-nanosecond time resolution due to the use of a picosecond pulsed pump-laser. Even polarization sensitive measurements were possible enabling further investigation of the behavior of the wave. The results were presented on the 67th annual Gaseous Electronics Conference and will also be
presented at the AIAA meeting in Kissimmee, Florida in January 2015, and at the DPG Spring Meeting in Bochum, Germany in April 2015.
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TP4
PROF. DR. YURI LITVINENKO
Prof. Dr. Yuri Litvinenko from the University of Waikato, New Zealand is a guest of Prof. Dr. Reinhard Schlickeiser (TP IV). He will give a talk on "Regular and diffusive photospheric flux cancellation" as part of the seminar "Space and Astrophysics" on Wednesday, 12.11.2014, 10:15 am in NB 7/67. Interested parties are cordially invited!
Abstract: Photospheric flux cancellation on the Sun is considered. Observations imply that cancellation can be a diffusive rather than regular process. A criterion is derived, which quantifies the parameter range in which diffusive photospheric cancellation should occur. Regular cancellation models are shown to give a quantitatively accurate description of photospheric cancellation. Application of the results to large-scale dispersal of the photospheric magnetic flux is discussed.
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COSI2ME 2014 - EXCHANGE WITH GREMI CONTINUES
The exchange with GREMI continues: "CoSi2Me", the DAAD PPP France Procope application, was approved for the years 2015 and 2016 (8.300 Euro travel funds), like this the close cooperation between Dr. Volker Schulz-von der Gathen (RUB) and Dr. Remi Dussart (GREMI, Orléans) can be continued. Congratulations!
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GEC 2014 IN RALEIGH, USA
The 67th GEC will be hosted by North Carolina State University from November 3rd - November 7th, 2014 in Raleigh, North Carolina, USA. PhD students Katja Rügner and Daniel Schröder (Research Unit FOR 1123 "Physics of Microplasmas", Experimentalphysics II, RUB) participated.
NCSU is one of the leading educational and research universities in the United States, and home to numerous groups focused on plasma science and plasma application. This presence is further strengthened by nearby Duke University and the University of North Carolina; the three universities forming the science and technology hub known as the Research Triangle, home to industry giants and high tech start-ups, many of which were launched out of NCSU.
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AEPT
DR. RENATE FÖRCH
Dr. Renate Förch from Fraunhofer ICT-IMM / BioNanoInterfaces, M4N from Mainz will give a lecture on "Active materials for wound healing - approaches and findings from the last two EU projects (EU-Project: Bacterio Safe - Active wound dressing based on biological mimicry & EU-Project: EMBEK1 - Development and analysis of polymer based multifunctional bactericidal materials) on Tuesday, December 2, 2014, 10:00 am in building ID 04/401. Interested parties are cordially invited!
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EP2
PROF. DR. ÖMER ILDAY
Prof. Dr. Ömer Ilday from Bilkent University at Ankara, Turkey, will be a guest at RUB from 27-29 October 2014. As part of Turkey Week, he will give a lecture on Bilkent University at Ankara (in English) in cooperation with the Institute of Experimental Physics II at RUB on October 28, 2014, starting at 16:00. This has been held in the International Lounge in the Mensa Building/Bistro Level. Interested parties are cordially invited.