Olgerts DUMBRAJS
|
Olgerts DUMBRAJS
Ph.D. in Physics
Full member (academician) of Latvian Academy of Sciences
Institute of Solid State Physics,
University of Latvia,
8 Kengaraga Str., LV-1063 RIGA, LatviaPhone: 371-7187-480 (office), 371-26359386
(mobile)
Fax: +371-713-2778, +371-2-225039
E-mail: olgerts.dumbrajs@lu.lv |
Born: February 16, 1942, Riga, Latvia
Main Research interests:
- Nuclear Physics
- Theoretical and Statistical Physics
- Plasma Physics
- Radio Physics (generation of infrared and millimeter waves)
- Deterministic Chaos
- Applied Mathematics
Education
- 1960-1966 B.S.+M.S. degrees: Dept. of Physics, Latvian State University, Riga, Latvia
- 1971 PhD degree: Moscow State University, Russia. Title of Thesis: ''Model independent
determination of real parts of hadron-hadron forward scattering amplitudes.''
Academic and Professional Experience
- 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.
Honours and Awards
Scientific Visits
- 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.
International expertise
Member of the International Coordinating Committee for the Development Program for the
Electron Cyclotron Wave Systems for the International Thermonuclear Experimental Reactor
Member of the Experts Group of the Fusion Program of the European Commission
INTAS Project Frequency tunable microwave sources for plasma applications
(coordinator)
INTAS Project Development and investigation of novel methods by gyrotron
efficiency enhancement by means of improved quality of the helical electron beam,
(participant)
Member of the European Plasma Physics Theory Committee
Latvias representative at Euratom STAC
Life member of the American Physical Society
Senior member of IEEE
Organiser of the 13th European Fusion Theory Conference to be held on 12-15 October
2009, Riga, Latvia
Fellowships
- In 2005 obtained a 24 months EURATOM fellowship for research topic
Stochastization of magnetic field lines and magnetic reconnection.
- In 2008 obtained a grant for the European project F4E-2008-GRT-08 Development
of the European Gyrotron.
Patents
- 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.
- O. Dumbrajs, A. Möbius, and M. Mühleisen . Ein in der Frequenz
einstellbares Gyrotron.
Patentanmeldung 19532785, Anmeldetag: 06.09.95. Deutsches Patentamt, München, 17.
April 1997.
- Dumbrajs. Innenleiter eines koaxialen Gyrotrons mit um den Umfang
gleichverteilten axialen Korrugationen.
Patentanmeldung 10040320.4, Anmeldetag: 17.08.2000. Deutsches Patentamt, München, 28.
Mai 2001.
Teaching Experience
- In 1967 I worked for 8 months as an assistant at the University of Latvia. During
this period I lectured at undergraduate level, giving courses on
"Electrodynamics", "Thermodynamics", and "Classical Field
Theory
- During my work at the Helsinki University of Technology (1993- 2005) I gave lectures on
Nuclear Physics and Introduction into Nonlinear Dynamics and
Chaos.
- I have supervised many BC and PhD theses in the fields Generation of Millimeter
Waves and Stellarator and tokamak physics.
PUBLICATIONS
Books:
O. Dumbrajs "Review of the mode competition in gyrotrons developed in
Russia."
Chapter in "Gyrotron Oscillators: Their Principles and Practice.
Editor C.J. Edgcombe, 1993, Taylor&Francis.
Review articles:
- 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).
- M.I. Airila and O. Dumbrajs. Stochastic
processes in gyrotrons.
Nuclear Fusion 43, 1446 (2003).
- O. Dumbrajs and G.S. Nusinovich. Coaxial
gyrotrons: past, present and future.
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.
Main (recent) papers
- 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 gyrotronsJ. 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 perturbationsPhys.
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 tokamakPlasma
Phys. Control.Fusion 53,085019 (2011).
Citations: more than 1900
Hirsh-index: 19
Journal |
IF2006 |
Number of papers |
Acta Phys. Pol. B |
0.882 |
3 |
Ann. Phys. |
3.019 |
1 |
Czech. J. Phys. |
0.568 |
1 |
Fortschr. der Physik |
2.007 |
3 |
Fusion Engin. Design |
0.598 |
1 |
IEEE Tr. Electron Devices |
2.052 |
1 |
IEEE Tr. Plasma Science |
1.144 |
23 |
Int. J. Electronics |
0.459 |
14 |
Int. J. Infrared Mill. Waves |
0.755 |
12 |
J. Appl. Phys. |
2.316 |
1 |
J. Comm. Tech. Electronics |
0.102 |
2 |
J. Exp. Theor. Phys. |
0.937 |
4 |
J. Part. Nucl. |
0.393 |
1 |
J. Phys. B |
2.024 |
2 |
J. Phys. G |
1.781 |
5 |
Nuovo Cimento B |
0.351 |
6 |
Nuclear Fusion |
3.278 |
8 |
Nuclear Physics A |
2.155 |
5 |
Nuclear Physics B |
5.199 |
15 |
Phys. Lett. B |
5.043 |
4 |
Phys. Plasmas |
2.258 |
17 |
Physics Reports |
10.438 |
1 |
Phys. Rev. A |
3.047 |
2 |
Phys. Rev. C |
3.327 |
5 |
Phys. Rev. D |
4.896 |
1 |
Phys. Rev. E |
2.438 |
1 |
Phys. Scripta |
1.161 |
1 |
Plasma Phys. Control. Fusion |
2.820 |
4 |
Rev. Scien. Instr. |
1.541 |
2 |
Teor. Mat. Fiz. |
0.626 |
2 |
Z. Naturforschung A |
0.904 |
9 |
Last update 8.06.2012