HZB physicist appointed to Gangneung-Wonju National University, South Korea
Dr Ji-Gwang Hwang at the new optical beam diagnostics platform at BESSY II. He will now take up a professorship at Gangneung-Wonju National University in South Korea. © HZB
Since 2016, accelerator physicist Ji-Gwang Hwang has been working at HZB in the department of storage rings and beam physics. He has made important contributions to beam diagnostics in several projects at HZB. He is now returning to his home country, South Korea, having accepted a professorship in physics at Gangneung-Wonju National University.
“We are very sad that he is leaving us, he is a great physicist and team mate and has made many important and valuable contributions to our research! But of course, we are also very happy, that he got this offer from a renowned university,”says Andreas Jankowiak, Director of the HZB-Institute for Accelerator Operation, Development and Technology.
Ji-Gwang Hwang has worked on the optical and RF diagnostics of the electron beam in HZB´s storage rings and bERLinPro and has analysed beam dynamics in BESSY II and a possible short-pulse option for BESSY III. Recently, together with Prof. Gregor Schiwietz, he established a new platform for optical beam diagnostics at BESSY II, which is now available for optimisation of beam operation and future research. Hwang completed his PhD in Accelerator Physics at the Kyungpook National University in Summer 2014 with a thesis on “Beam dynamics in a high brightness injector for a superconducting Energy Recovery Linac”. His first postdoc took the young accelerator physicist to the Korea Institute of Radiological & Medical Sciences, where tumour patients can be treated with accelerated carbon ions. “The position at HZB was perfect to continue my career in science,” he says.
During his time at HZB, Hwang has contributed to more than 10 peer-reviewed publications and obtained a significant patent. "One of the reasons for moving to Korea is my newborn son," says the physicist. "I didn't want to deprive my mother of her precious time with her only grandson." South Korea also invests heavily in research, with almost 5 per cent of its gross domestic product (GDP) spent on research and development*.
As a physics professor, Hwang now also has new responsibilities, including 12 hours of lectures a week and supervising of students. A task he is happy to take on. "It will take a lot of time at first. But in the next few years I will also set up my own laboratory and of course continue to collaborate with HZB," says the physicist. “We will certainly miss Ji-Gwang in our team,”adds group leader Markus Ries.
* https://www.statista.com/statistics/1326558/south-korea-randd-spending-as-share-of-gdp/
- Small powerhouses for very special lightAn international team presents the functional principle of a new source of synchrotron radiation in Nature Communications Physics. Steady-state microbunching (SSMB) allows to build efficient and powerful radiation sources for coherent UV radiation in the future. This is very attractive for applications in basic research as well in the semiconductor industry.
- New Method for Absorption Correction to Improve Dental FillingsA research team led by Dr. Ioanna Mantouvalou has developed a method to more accurately depict the elemental distributions in dental materials than previously possible. The used confocal micro-X-ray fluorescence (micro-XRF) analysis provides three-dimensional elemental images that contain distortions. These distortions occur when X-rays pass through materials of different densities and compositions. By utilizing micro-CT data, which provides detailed 3D images of the material structure, and chemical information from X-ray absorption spectroscopy (XAS) experiments conducted in the laboratory (BLiX, TU Berlin) and at the synchrotron light source BESSY II, the researchers have improved the method.
- MXenes for energy storage: Chemical imaging more than just surface deepA new method in spectromicroscopy significantly improves the study of chemical reactions at the nanoscale, both on surfaces and inside layered materials. Scanning X-ray microscopy (SXM) at MAXYMUS beamline of BESSY II enables the investigation of chemical species adsorbed on the top layer (surface) or intercalated within the MXene electrode (bulk) with high chemical sensitivity. The method was developed by a HZB team led by Dr. Tristan Petit. The scientists demonstrated among others first SXM on MXene flakes, a material used as electrode in lithium-ion batteries.