Stefan Janos

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

Stefan Janos

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 .

He completed his one-year military service in 1966 at the Research and Testing Center of the Ministry of Defense in Brno . In 1967 he took up the post of assistant in the Faculty of Natural Sciences at the Pavol-Jozef-Šafárik University Košice (UPJŠ) in Košice . In 1970 he completed a study visit at the B. Verkin Institute for Low Temperature Physics and Engineering and Engineering of the Ukrainian Academy of Sciences , in Kharkiv with Boris Eselson . There he studied the properties of 3 He - atoms in superfluid state in 4 He at 0.3 K. About two years later another scholarship took him to the Aalto University of Helsinki in the laboratory of Olli V. Lounasmaa . 1976 Janos was the subject of his dissertation study of the magnon component of the thermal conductivity of materials with magnetic properties doctorate . From 1976 to 1980 he worked at the Faculty of Natural Sciences of the UPJŠ in Košice. From 1980 to 1984 Janos was head of the low temperature physics department in Košice. He researched superfluid 3 He, the point-contact spectroscopy of metals , the use of low temperatures in ophthalmology , gynecology and plastic surgery and was active in the construction of various cryogenic apparatus. In 1982, Janos was due to the investigation of the thermal conductivity of Ce, Pr, Nd, Sm, Eu in the temperature range from 0.5 to 10 K habilitation . From 1984 to 1990 he worked at the Faculty of Mathematics and Physics at the Comenius University in Bratislava . He gave lectures on optics and problems in low temperature physics. His scientific research focused on the superfluidity of 3 He in 300 µK. He studied thin layers of the high-temperature superconductor RE Ba CuO (RE = Y, Dy, Ho, Gd, Sm, Nd, Eu ).

From June 15, 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 was dedicated to the transition phase in superconducting Sn, Zn, In and Al spheres and In and Al microstructures, as well as SQUIDs ( Superconducting Quantum Interference Device ).

From April 1, 1994 to 1997, he worked as a lecturer at the University of Bern. He participated in the development and construction of the ORPHEUS detector and in the experimental investigation of superconducting microstructures. Janos carried out internships in physics for students of chemistry , biochemistry and pharmacy . He gave lectures 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 silicon detectors that had been exposed to strong radiation.

Janos was granted Swiss citizenship on February 17, 2004 . From March 1, 2004 he was a professor at the University of Bern. Until 2009 he held lectures and internships there. Between 2006 and 2009 he participated in the installation of a central system for liquid argon and cryostats for the Time Projection Chamber for the detection of elementary particles in the laboratory for high energy physics at the University of Bern. He retired on February 1, 2009.

Awards

In 1988 Janos received the Slovak Academy of Sciences award for point-contact spectroscopy applications. In 2003 he was awarded the plaque of honor from Dionyz Ilkovič - the Slovak Academy of Sciences - for merits in research in physical-chemical sciences, in the field of low-temperature physics at the Institute of 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 was awarded the gold medal of the PF UPJŠ in Kosice for the establishment of low temperature physics at the faculty and his contribution to the development of the university. In the same year he was honored with the golden plaque of the Slovak Academy of Sciences in Košice on the occasion of the 40th anniversary of the establishment of the IE. He is an honorary member of the Slovak Physical Society .

Publications

Web links

Individual evidence

  1. ↑ P. Kus, S. Janos: Preparation of Gd-Ba-Cu-O superconducting thin films on SrTiO3, Al 2O3 and ZrO2 by magnetron sputtering. In: Modern Phys. Lett. B2 (1988), pp. 1151-1154.
  2. ↑ P. Kus, S. Janos: Preparation of Gd-Ba-Cu-O superconducting thin films on silicon substrates by magnetron sputtering. In: Modern Phys. Lett. B3 (1989), pp. 37-40.
  3. ↑ K. Borer, G. Czapek, F. Hasenbalg, M. Hauser, S. Janos et al: First results with the ORPHEUS dark matter detector. In: Astroparticle Physics. 22, 2004, pp. 199-210, doi: 10.1016 / j.astropartphys.2004.06.005 .
  4. ↑ S. Janos et al: The Bern Cryogenic Detector System for dark matter search. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 547, 2005, pp. 359-367. doi: 10.1016 / j.nima.2005.03.155 .
  5. ↑ Vittorio Giulio Palmieri, Kurt Borer a. a .: Evidence for charge collection efficiency recovery in heavily irradiated silicon detectors operated at cryogenic temperatures. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 413, 1998, pp. 475-478. doi: 10.1016 / S0168-9002 (98) 00673-1 .
  6. ↑ A. Ereditato, M. Hess, S. Janos et al: Study of ionization signals in a TPC filled with a mixture of liquid Argon and Nitrogen. In: Journal of Instrumentation. 3 (2008), p. P10002.
  7. ↑ A. Ereditato, M. Hess, S. Janos et al: A prototype liquid Argon Time Projection Chamber for the study of UV laser multi-photonic ionization. In: Journal of Instrumentation. 4 (2009), p. P07011.
personal data
SURNAME Janos, Stefan
ALTERNATIVE NAMES Jánoš, Štefan
BRIEF DESCRIPTION Slovak-Swiss physicist
DATE OF BIRTH December 22, 1943
PLACE OF BIRTH Kuchyňa , Slovakia