Source: http://www.lza.lv/scientists/DumbrajsO.htm
Timestamp: 2019-04-23 06:54:35+00:00

Document:
1971-1976 Research worker at the Joint Institute for Nuclear Research, Dubna, Russia.
1977-1978 Research worker at the Helsinki University, Finland.
1978-1979 Research worker at the Institutes for Nuclear Research in Zürich, Geneva, and Paris.
1979-1980 Professor at the Aarhus University, Aarhus, Denmark.
1979-1983 Research worker at the University Karlsruhe, Karlsruhe, Germany.
1983-1992 Group leader at the University Hamburg-Harburg, Germany.
1992-2008 Special research worker at the Academy of Finland and Helsinki University of Technology, Finland.
2006 - Leading Research Scientist at the Institute of Solid State Physics, University of Latvia, Riga, Latvia.
1999- 2000 (twelve months) guest scientist at the Research Centre Karlsruhe, Germany.
2002 (three months) guest professor at Fukui University, Japan.
2003 (four months) guest professor at Fukui University, Japan.
2004 (four month) guest scientist at the Research Centre Karlsruhe, Germany.
2005 (three months) guest professor at Fukui University, Japan.
2006 (three months) guest professor at Fukui University, Japan.
2007 (three months) guest professor at Fukui University, Japan.
2010 (three months) guest professor at Fukui University, Japan.
2012 (three months) guest professor at Fukui University, Japan.
O. Dumbrajs and A. Möbius. "Verfahren zur Erhöhung und/oder Sicherstellung des Wirkungsgrades eines Gyrotrons und Gyrotron zur Durchführung des Verfahrens."
Patentanmeldung 4236149.4, Anmeldetag: 27.10.92. Deutsches Patentamt, München, 27. Oktober 1995.
Patentanmeldung 19532785, Anmeldetag: 06.09.95. Deutsches Patentamt, München, 17. April 1997.
Patentanmeldung 10040320.4, Anmeldetag: 17.08.2000. Deutsches Patentamt, München, 28. Mai 2001.
During my work at the Helsinki University of Technology (1993- 2005) I gave lectures on Nuclear Physics and Introduction into Nonlinear Dynamics and Chaos.
O. Dumbrajs "Review of the mode competition in gyrotrons developed in Russia."
Editor C.J. Edgcombe, 1993, Taylor&Francis.
O. Dumbrajs. "Strong interaction and numerical analytic continuation."
Sov. J. Part. Nucl. 6, 132 (1973).
S. Dubnicka and O. Dumbrajs. "Analyticity in hadron-nuclei binary reactions."
Phys. Reports 19C, 141 (1975).
O. Dumbrajs and M. Staszel. "Forward dispersion relations: two decades of life."
Postepy Fizyki 27, 253 (1976).
O. Dumbrajs. "Inverse problem in nuclear and particle physics."
Postepy Fizyki 28, 417 (1977).
O. Dumbrajs, R. Koch, G. Oades, H. Behrens, J.J. De Swart, and P. Kroll. "Compilation of coupling constants and low-energy scattering parameters."
Nucl. Phys. B216, 277 (1983).
Nuclear Fusion 43, 1446 (2003).
IEEE Transactions on Plasma Science, 32, 934 (2004).
Papers: more than 190 refereed papers and more than 110 reports in proceedings of international scientific conferences.
O. Dumbrajs, V. Igochine, D. Constantinescu, H. Zohm, and ASDEX Upgrade team. Stochastization as a possible cause of fast reconnection in the frequently interrupted regime of neoclassical tearing modes. Phys. Plasmas 12, 110704 (2005).
V. Igochine, O. Dumbrajs, D. Constantinescu, H. Zohm, G. Zvejnieks. Stochastization as a possible cause for fast reconnection during MHD mode activity in the ASDEX Upgrade tokamak. Nuclear Fusion 46, 741 (2006).
O. Dumbrajs, V. Igochine, and H. Zohm. "Diffusion in a stochastic magnetic field in ASDEX Upgrade." Nucl. Fusion 48, 024011 (2008).
D. Constantinescu, O. Dumbrajs, V. Igochine, and B. Weyssow. "On the accuracy of some mapping techniques used to study the magnetic field dynamics in tokamaks." Nucl. Fusion 48, 024017 (2008).
O. Dumbrajs and T. Idehara. "Hysteresis in mode competition in high power 170 GHz gyrotron for ITER." Int. J. Infrared Millimeter Waves 29, 232 (2008).
O. Dumbrajs, Y. Kominis and G.S. Nusinovich.Electron dynamics in the process of mode switching in gyrotrons. Physics of Plasmas 16, 013102 (2009).
O. Dumbrajs, V. Igochine, A. Gude, M. Maraschek, and H. Zohm. Temporal evolution of neoclassical tearing modes in the frequently interrupted regime. Physics of Plasmas 17, 053104 (2010).
O. Dumbrajs and G.S. Nusinovich. To the theory of high-power gyrotrons with uptapered resonators. Phys. Plasmas 17, 053104 (2010).
O. Dumbrajs.Influence of possible reflections on the operation of European ITER gyrotronsJ. Infrared Milli.Terahz. Waves 31, 892 (2010).
O. Dumbrajs, T. Idehara, and S.Sabchevski.Design of an optimized resonant cavity for a compact sub-Terahertz gyrotron J.Infrared Milli. Terahz. Waves 31, 1115 (2010.
O. Dumbrajs, and T. Idehara.Frequency tunable gyrotron FU CW VA for measuring hyperfine split of positronium J.Infrared Milli. Terahz. Waves 31,1265 (2010).
V. Igochine, J. Boom, I. Classen, O.Dumbrajs, K. Lackner, G. Pereverzev, H.Zohm and ASDEX-U team.Structure and dynamics of sawteeth crashes in ASDEX Upgrade Phys. Plasmas 17, 122506 (2010).
D. Constantinescu, O. Dumbrajs, V. Igochine, K. Lackner, R. Meyer-Spasche and H. Zohm. A low-dimensional model system for quasi-periodic plasma perturbationsPhys. Plasmas 18, 062307 (2011).
Erzhong Li, Liqun Hu, V. Igochine, O. Dumbrajs, and Kaiyun Chen.Understanding complex magnetohydrodynamic activities associated with a relaxation in HT-7 tokamakPlasma Phys. Control.Fusion 53,085019 (2011).

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