Stefan Janos (physicist)

Stefan Janos (Slovak Štefan Jánoš, born December 22, 1943 in Kuchyňa, Slovakia) is a Slovak- Swiss physicist, professor emeritus of Low Temperature Physics and founder of the low-temperature physics in Slovakia.

Life

From 1950 to 1958 he attended primary school in Suchohrad and Záhorská Ves. In 1961 he graduated from high school in Malacky. From 1961 to 1966 he studied at the Faculty of Technology and Nuclear Physics of the Czech Technical University in Prague. In 1966, he presented his doctoral thesis on the specific heat of iron -cobalt alloys in the temperature range from 1.4 to 4.2 Kelvin.

The one-year military service in 1966 he graduated in Research and Testing Centre of the Ministry of Defence in Brno. In 1967 he resigned the office of the assistant in the Faculty of Science at the Pavol Jozef Šafárik University of Košice ( UPJŠ ) in Košice. In 1970 he completed a period of study at the Physical -Technical Institute of Physics and Technology of the Ukrainian Academy of Sciences, Kharkiv Boris Eselson. He studied the properties of 3He atoms in the superfluid state in 4He at 0.3 K. Approximately two years later led him another scholarship at the Helsinki University of Technology in the laboratory of Olli V. Lounasmaa. 1976 Janos earned his doctorate under Vladimir Hajko on the subject of his dissertation study of the magnon component of the thermal conductivity of materials with magnetic configuration. From 1976 to 1980 he worked at the Faculty of Natural Sciences of UPJŠ in Košice. From 1980 to 1984, Janos Head of the Department for Low Temperature Physics in Kosice. He explored superfluid 3He, the point - contact spectroscopy of metals, the application of low temperatures in ophthalmology, gynecology and plastic surgery and construction of various cryogenic apparatus. In 1982 was Janos habilitation because the study of thermal conductivity of Ce, Pr, Nd, Sm, Eu, in the temperature range from 0.5 to 10 K. From 1984 to 1990 he worked at the Faculty of the Comenius University in Bratislava, Faculty of Mathematics and Physics. He lectured on optics and the problems of low temperature physics. His scientific research focused on superfluidity of 3He in 300 μK in collaboration with the Department of the Institute for Low Temperature Physics, Faculty of Science and the university. Studied thin layers of the high-temperature superconductor REBaCuO (RE = Y, Dy, Ho, Gd, Sm, Nd, Eu). ,

From 15 June 1990 to 1994 he worked as an assistant professor in the Laboratory for High Energy Physics at the University of Bern in Switzerland. He participated in the development of the SSG detector ( Superheated Superconducting Granules ) for neutrinos and dark matter in the universe. Test measurements were carried out at the Paul Scherrer Institute in Switzerland. His experimental work devoted to the transition phase in superconducting Sn, Zn, In and Al beads and In and Al microstructures, as well as SQUIDs (Superconducting Quantum Interference Device).

From 1 April 1994 to 1997, he worked as a lecturer at the University of Bern. Janos was involved in the development of the SSG detector for neutrinos and dark matter. He participated in the development and construction of the detector ORPHEUS in the underground laboratory and the experimental investigation of superconducting microstructures, Janos led by Internships in Physics for students of chemistry, biochemistry and pharmacy. He lectured on superfluidity, superconductivity and the physical properties of solids at low temperatures for students of physics and astronomy. He participated in the discovery of the so-called Lazarus effect ( 1997), which restored the functionality of the silicon detectors, which were exposed to a strong radiation.

February 17, 2004 Janos acquired Swiss citizenship. From 1 March 2004 he was a professor at the University of Bern. Until 2009 he held lectures there and internships. He designed and participated in the installation of a centralized system for liquid argon cryostat and a vacuum system for the Time Projection Chamber for the detection of elementary particles in the Laboratory for High Energy Physics at the University of Bern., On February 1, 2009, he entered the retirement.

Awards

1988 Janos won the Prize of the Slovak Academy of Sciences for the use of point - contact spectroscopy. In 2003 he became the honorary plaque from Dionyz Ilkovič - the Slovak Academy of Sciences - for achievements in research in physical and chemical sciences, in the field of low temperature physics at the Institute for Experimental Physics (IE) of the Slovak Academy of Sciences, at the UPJŠ and for the development of superconducting detectors for the detection of elementary particles at the University of Bern, honored. In 2009 he received the Gold Medal of PF UPJŠ in Kosice for the establishment of the low-temperature physics at the Faculty and contribute to the development of the university. In the same year 2009, he was honored with the Golden Medal of the Slovak Academy of Sciences in Košice on the occasion of the 40th anniversary of the founding of IE. He is an honorary member of the Slovak Physical Society.

Publications

• Book in English: Hajko inter alia: Physics in the experiment. VEDA, Bratislava 1997 [ ISBN 80-224-0483-7 ] ( Co -author )

• Books in Slovak: Štefan Jánoš: Low Temperature Physics. ALFA, Bratislava 1980 ( monograph )
• Hajko and collective: physics experiments. VEDA, Bratislava, 1997 ( co-author )
• Štefan Jánoš: The world near to absolute zero. ALFA, Bratislava, 1990, [ ISBN 80-05-00045-6 ] ( nonfiction )