O. Dumbrajs

Details der Publikationsliste

Zeitraum

1984 - 2009

Anzahl

239

Co-Autoren

Testing and development of a 1MW/170GHz coaxial-cavity gyrotron for ITER and the CRPP gyrotron test stand. (2009)

Porte, L., Alberti, S., Albajar, F., Avramides, K.A., Benin, P., Bin, W., ...

5th IAEA Technical Meeting on ECRH Physics and Technology for Large Fusion Devices, Gandhinagar, IND, February 18-20, 2009

Gyrotron mode competition calculations: investigations on the choice of numerical parameters. (2008)

Kern, S., Avramides, K.A., Beringer, M.H., Dumbrajs, O., Liu, Y.H.

Internat.Conf.on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), Pasadena, Calif., September 15-19, 2008

Status of the European 2 MW, 170 GHz coaxial cavity gyrotron for ITER. (2008)

Piosczyk, B., Alberti, S., Albajar, F., Avramidis, K., Benin, P., Bonicelli, T., ...

7th Internat.Workshop Strong Microwaves: Sources and Applications, Nizhny Novgorod, Russia, July 27 - August 2, 2008

Status of experiments on the EU 2MW coaxial cavity ITER gyrotron pre-prototype at FZK. (2008)

Kern, S., Rzesnicki, T., Gantenbein, G., Illy, S., Jin, J., Piosczyk, B., ...

15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Yosemite National Park, Calif., March 10-13, 2008

First experimental results from the EU 2 MW coaxial cavity ITER gyrotron prototype. (2008)

Goodman, T.P., Alberti, S., Droz, E., Fasel, D., Hogge, J.P., Porte, L., ...

15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Yosemite National Park, Calif., March 10-13, 2008

Progess of the European 2 MW, 170 GHz coaxial cavity gyrotron for ITER. (2008)

Thumm, M., Flamm, J., Gantenbein, G., Illy, S., Jin, J., Kern, S., ...

Workshop on RF-Heating Technology of Fusion Plasmas 2008, San Diego, Calif., September 10-12, 2008

Status of development of the 2MW, 170 GHz coaxial-cavity gyrotron for ITER. (2008)

Alberti, S., Albajar, F., Avramides, K.A., Benin, P., Bin, W., Bonicelli, T., ...

Internat.Conf.on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), Pasadena, Calif., September 15-19, 2008

Mode selection for a 170 GHz, 1 MW gyrotron. (2008)

Avramides, K.A., Dumbrajs, O., Kern, S., Pagonakis, I.Gr., Vomvoridis, J.L.

7th School of Fusion Physics and Technology, Volos, GR, April 14-19, 2008

Status of the 2 MW, 170 GHz coaxial cavity gyrotron for ITER. (2007)

Piosczyk, B., Albajar, F., Alberti, S., Benin, P., Bin, W., Bonicelli, T., ...

4th IAEA Technical Meeting on ECRH Physics and Technology for ITER, Wien, A, June 6-8, 2007

170 GHz, 2 MW coaxial cavity gyrotron - status. (2007)

Piosczyk, B., Albajar, F., Alberti, S., Benin, P., Bin, W., Bonicelli, T., ...

19th Joint Russian-German STC Workshop on ECRH and Gyrotrons, Karlsruhe/Stuttgart/Garching, July 18-24, 2007

Dual frequency operation of the W7-X gyrotron. (2007)

Michel, G., Braune, H., Erckmann, V., Laqua, H., Noke, F., Purps, F., ...

19th Joint Russian-German STC Workshop on ECRH and Gyrotrons, Karlsruhe/Stuttgart/Garching, July 18-24, 2007

Status of the 2 MW, 170 GHz coaxial cavity gyrotron for ITER. (2007)

Piosczyk, B., Rzesnicki, T., Albajar, F., Alberti, S., Benin, P., Bin, W., ...

Workshop on RF Heating Technology of Fusion Plasmas, Heidelberg, September 10- 12, 2007

High-power gyrotron development at Forschungszentrum Karlsruhe for fusion applications (2006)

Dammertz, G., Alberti, S., Arnold, A., Bariou, D., Brand, P., Braune, H., ...

In the first part of this paper, the status of the 140-GHz continuously operated gyrotrons with an output power of I MW for the stellarator Wendelstein 7-X will be described. With the first series...

High power gyrotron development in EU for present fusion experiments and for ITER. (2006)

Thumm, M., Alberti, S., Arnold, A., Bariou, D., Dammertz, G., Darbos, C., ...

Workshop on Electron Cyclotron Masers (ECMs) for Fusion Engineering and other Applications (EFEA-2006), Roorkee, IND, April 18, 2006

2 MW, CW, 170 GHz coaxial-cavity gyrotron - experimental results with the pre-prototype and status. (2006)

Piosczyk, B., Dammertz, G., Dumbrajs, O., Gantenbein, G., Illy, S., Jin, J., ...

18th Joint Russian-German STC Workshop on ECRH and Gyrotrons, Nizhny Novgorod, Russia, June 20-27, 2006

EU developments of the ITER ECRH system. (2006)

Henderson, M.A., Alberti, S., Benin, P., Bonicelli, T., Chavan, R., Campbell, D., ...

24th Symp.on Fusion Technology (SOFT 2006), Warszawa, PL, September 11-15, 2006

Development of a 2-MW, CW coaxial gyrotron at 170 GHz and test facility for ITER. (2005)

Hogge, J.P., Alberti, S., Arnold, A., Bariou, D., Benin, P., Bonicelli, T., ...

3rd IAEA Technical Meeting on ECRH Physics and Technology for ITER, Como, I, May 2-4, 2005

Gyrotron development in EU for present fusion experiments and for ITER. (2005)

Thumm, M., Alberti, S., Arnold, A., Bariou, D., Dammertz, G., Darbos, C., ...

7th Internat.High Energy Density and High Power RF Workshop, Kalamata, GR, June 13-17, 2005

Progress in the development of the 170 GHz coaxial cavity gyrotron for ITER. (2005)

Piosczyk, B., Alberti, S., Bariou, D., Benin, P., Bonicelli, T., Dammertz, G., ...

6th Internat.Workshop on Strong Microwaves in Plasmas, Nizhny-Novgorod, Russia, July 25 - August 1, 2005

170 GHz, 2 MW, CW coaxial cavity gyrotron. Experimental verification of the design. (2005)

Piosczyk, B., Rzesnicki, T., Dammertz, G., Dumbrajs, O., Illy, S., Jin, J., ...

IRMMW-THz 2005 : The Joint 30th Internat.Conf.on Infrared and Millimeter Waves and 13th Internat.Conf.on Terahertz Electronics, Williamsburg, Va., September 19-23, 2005

Autoregressive moving average model for analyzing edge localized mode time series on Axially Symmetric Divertor Experiment (ASDEX) Upgrade tokamak (2004)

Zvejnieks, G., Kuzovkov, V. N., Dumbrajs, O., Degeling, A. W., Suttrop, W., Urano, H., ...

An approach to analysis of time series of edge localized modes (ELMs) is proposed. It is based on the use of the autoregressive moving average model, which decomposes time series into deterministic...

The search for chaotic edge localized modes in ASDEX Upgrade (2004)

Hynonen, V., Dumbrajs, O., Degeling, A. W., Kurki-Suonio, T., Urano, H.

Time intervals between edge localized modes (ELMs) from the ASDEX Upgrade tokamak have been analysed to determine whether the ELM dynamics is chaotic (deterministic) or random (noise dominated). Two...

A 2-MW, 170-GHz coaxial cavity gyrotron. (2004)

Piosczyk, B., Dammertz, G., Dumbrajs, O., Drumm, O., Illy, S., Jin, J., ...

ICOPS 2003 : 30th IEEE Internat.Conf.on Plasma Science, Jeju, Korea, June 2-5, 2003

Development of a 2 MW, CW, 170 GHz coaxial cavity gyrotrons for ITER. (2004)

Hogge, J.P., Alberti, S., Arnold, A., Bariou, D., Beunas, A., Bonicelli, T., ...

13th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Nizhny Novgorod, Russia, May 17-20, 2004

Development of advanced high power gyrotrons for EC H&CD applications in fusion plasmas. (2004)

Piosczyk, B., Arnold, A., Borie, E., Dammertz, G., Dumbrajs, O., Heidinger, R., ...

13th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Nizhny Novgorod, Russia, May 17-20, 2004

2 MW, CW, 170 GHz coaxial cavity gyrotron. (2004)

Piosczyk, B., Arnold, A., Budig, H., Dammertz, G., Illy, S., Jin, J., ...

Displays and Vacuum Electronics : Proc.of the 10th Triennial ITG-Conf., Garmisch-Partenkirchen, May 3-4, 2004

Progress in the development of the 170 GHz coaxial cavity gyrotron. (2004)

Piosczyk, B., Rzesnicki, T., Arnold, A., Budig, H., Dammertz, G., Dumbrajs, O., ...

Conference Digest of the Joint 29th Internat.Conf.on Infrared and Millimeter Waves and 12th Internat.Conf.on Terahertz Electronics, Karlsruhe, September 27 - October 1, 2004

Reflections in gyrotrons with radial output: consequences for the ITER coaxial gyrotron. (2004)

Dumbrajs, O., Nusinovich, G.S., Piosczyk, B.

Conference Digest of the Joint 29th Internat.Conf.on Infrared and Millimeter Waves and 12th Internat.Conf.on Terahertz Electronics, Karlsruhe, September 27 - October 1, 2004

Research on advanced high power gyrotrons at FZK. (2004)

Piosczyk, B., Arnold, A., Dammertz, G., Dumbrajs, O., Heidinger, R., Illy, S., ...

15th Internat.Conf.on High-Power Particle Beams, St.Petersburg, Russia, July 19-23, 2004

Experiments on a 170 GHz coaxial cavity gyrotron. (2004)

Piosczyk, B., Arnold, A., Budig, H., Dammertz, G., Dumbrajs, O., Heidinger, R., ...

23rd Symp.on Fusion Technology (SOFT), Venezia, I, September 20-24, 2004

Development of high power gyrotrons for fusion plasma applications in the EU. (2004)

Tran, M.Q., Alberti, S., Arnold, A., Bariou, D., Borie, E., Dammertz, G., ...

Conference Digest of the Joint 29th Internat.Conf.on Infrared and Millimeter Waves and 12th Internat.Conf.on Terahertz Electronics, Karlsruhe, September 27 - October 1, 2004

Overview of JET results (2003)

Pamela, J., Solano, E. R., Adams, J. M., Agarici, G., Agarici, M., Akhter, H., ...

Scientific and technical activities on JET focus on the issues likely to affect the ITER design and operation. Our understanding of the ITER reference mode of operation, the ELMy H-mode, has...

Towards a 2 MW, CW, 170 GHz coaxial cavity gyrotron for ITER. (2003)

Piosczyk, B., Arnold, A., Budig, H., Dammertz, G., Dumbrajs, O., Drumm, O., ...

22nd Symp.on Fusion Technology (SOFT), Helsinki, SF, September 9-13, 2002

Hysteresis in gyrotrons. (2003)

Dumbrajs, O., Idehara, T., Iwata, Y., Mitsudo, S., Ogawa, I., Piosczyk, B.

Proc.of the 2nd Internat.Workshop on Far Infrared Technologies, Fukui, J, September 12-13, 2002

Development of a 2 MW, CW, 170 GHz coaxial cavity gyrotrons for ITER. (2003)

Piosczyk, B., Alberti, S., Arnold, A., Beunas, A., Borie, E., Budig, H., ...

20th IEEE/NPSS Symp.on Fusion Engineering, San Diego, Calif., October 14-17, 2003

A coaxial cavity gyrotron - recent results and future plans. (2003)

Piosczyk, B., Budig, H., Dammertz, G., Dumbrajs, O., Drumm, O., Illy, S., ...

15th Joint Russian-German STC Workshop on ECRH and Gyrotrons, Karlsruhe/Stuttgart/Garching, June 25 - July 1, 2003

A 2 MW, CW, 170 GHz gyrotron for ITER. (2002)

Piosczyk, B., Alberti, S., Arnold, A., Borie, E., Budig, H., Dammertz, G., ...

19th IAEA Fusion Energy Conf., Lyon, F, October 14-19, 2002

A coaxial cavity gyrotron. Experimental results and data for a technical design. (2002)

Piosczyk, B., Arnold, A., Budig, H., Dammertz, G., Drumm, O., Dumbrajs, O., ...

14th Joint Russian-German Workshop on ECRH and Gyrotrons, Nizhny Novgorod/Moskva, June 25 - July 2, 2002

On the negative-mass instability in gyrotrons (2001)

Dumbrajs, O., Nikkola, P., Piosczyk, B.

Space-charge effects (so-called negative-mass instability) as the reason for electron energy spread arising in the region of the electron drift between the cathode and the cavity of a gyrotron are...

On the negative-mass instability in gyrotrons. (2001)

Dumbrajs, O., Nikkola, P., Piosczyk, B.

International Journal of Electronics, 88(2001) S.215-24

Advanced high power gyrotrons for fusion applications. (2001)

Piosczyk, B., Arnold, A., Dammertz, G., Illy, S., Kuntze, M., Koppenburg, K., ...

Displays and Vacuum Electronics : Contributions to the 9th ITG-Conf., Garmisch-Partenkirchen, May 2-3, 2001

Progress in the development of advanced high power gyrotrons. (2001)

Piosczyk, B., Arnold, A., Borie, E., Dammertz, G., Drumm, O., Dumbrajs, O., ...

Proc.of the 2nd IEEE Internat.Vacuum Electronics Conf ; IVEC 2001 ; Noordwijk, NL, April 2-4, 2001

Coaxial cavity gyrotron - present status and recent results. (2001)

Piosczyk, B., Arnold, A., Budig, H., Dammertz, G., Drumm, O., Dumbrajs, O., ...

13th Joint Russian-German Workshop on ECRH and Gyrotrons (STC-Meeting), IPP Greifswald, July 16-21, 2001

Mode selection for 2 MW, CW 170 GHz coaxial cavity gyrotron. (2001)

Dumbrajs, O., Piosczyk, B., Iatrou, C.T.

13th Joint Russian-German Workshop on ECRH and Gyrotrons (STC-Meeting), IPP Greifswald, July 16-21, 2001

Maximum entropy method and oscillations in the diffraction cone (2000)

Dumbrajs, O., Kontros, J., Lengyel, A.

The maximum entropy method has been applied to investigate the oscillating structure in the pbarp- and pp-elastic scattering differential cross-section at high energy and small momentum transfer....

Space charge effects as a source of electron energy spread and efficiency degradation in gyrotrons (2000)

Bratman, V. L., Dumbrajs, O., Nikkola, P., Savilov, A. V.

Space charge effects (so-called negative-mass instability) as the reason for electron energy spread developing in the region of the electron drift between the cathode and the cavity of a gyrotron are...

165 GHz, TE§3§1§,§1§7 coaxial gyrotron. (2000)

Piosczyk, B., Arnold, A., Dammertz, G., Dumbrajs, O., Kuntze, M., Pavelyev, A.B., ...

12th Joint Russian-German Meeting on ECRH and Gyrotrons, Nizhny Novgorod, Russia, June 21-28, 2000

Design considerations for a multi-megawatt coaxial cavity gyrotron at 170 GHz. (2000)

Dumbrajs, O., Iatrou, Ch., Pavelyev, A.B., Piosczyk, B., Thumm, M.

12th Joint Russian-German Meeting on ECRH and Gyrotrons, Nizhny Novgorod, Russia, June 21-28, 2000

Frequency-step-tunable high-power gyrotrons for plasma physics applications. (1999)

Dammertz, G., Dumbrajs, O., Koppenburg, K., Piosczyk, B., Thumm, M.

Internat.University Conf.Electronics and Radiophysics of Ultra-High Frequencies, St.Petersburg, Russia, May 24-28, 1999

Multifrequency operation of a gyrotron. (1999)

Dumbrajs, O., Anderer, J., Illy, S., Piosczyk, B., Thumm, M., Zavolsky, N.A.

Research Workshop of the Israel Science Foundation on Cyclotron Resonance Masers and Gyrotrons, Kibbuz Ma'ale Hachamisha, IL, May 18-21, 1998

Frequency-step-tunable megawatt gyrotrons for the D-band (110-170 GHz). (1999)

Thumm, M., Arnold, A., Borie, E., Braz, O., Dammertz, G., Dumbrajs, O., ...

Seminar of the Japanese Society on Infrared Science and Technology, Tokyo, J, October 1, 1999

Impact of edge electric fields on particle transport and dynamics in Tokamaks (1998)

Dumbrajs, O., Heikkinen, Jukka, Karttunen, Seppo, Kiviniemi, T., Kurki-Suonio, T., Pättikangas, Timo, ...

17th International Conference on Fusion Energy. Ykohama, JP, 18 - 24 Oct. 1998. Paper IAEA-F1-CN-69/THP2/10

Measurements of electron beam energy spread. (1998)

Piosczyk, B., Dammertz, G., Illy, S., Dumbrajs, O.

10th Joint Russian-German Meeting on ECRH and Gyrotrons, Nizhny Novgorod, Russia, June 16-22, 1998

Advanced operation regimes of coaxial gyrotron. (1998)

Dumbrajs, O., Anderer, J., Illy, S., Piosczyk, B., Thumm, M.

Research Workshop of the Israel Science Foundation on Cyclotron-Resonance Masers and Gyrotrons, Kibbutz Ma'ale Hachamisha, IL, May 18-21, 1998

Development of a 1.5 MW, 140 GHz coaxial gyrotron. (1995)

Piosczyk, B., Braz, O., Dammertz, G., Iatrou, C.T., Kern, S., Möbius, A., ...

Invited and Contributed Papers pres.at the 20th Internat.Conf.on Infrared and Millimeter Waves, Lake Buena Vista, Orlando, Fla., December 11-14, 1995

Mode selection and design of a harmonic gyrotron for plasma diagnostics. (1995)

Dumbrajs, O., Koponen, J., Iatrou, C.T., Piosczyk, B., Thumm, M.

Invited and Contributed Papers pres.at the 20th Internat.Conf.on Infrared and Millimeter Waves, Lake Buena Vista, Orlando, Fla., December 11-14, 1995

Gyrotrons for technological applications. (1994)

Dumbrajs, O., Thumm, M.

International Journal of Electronics, 76(1994) S.351-64

A 500 kW, 140 GHz gyrotron in an asymmetric volume mode for fusion plasma application. (1993)

Borie, E., Gantenbein, G., Dammertz, G., Dumbrajs, O., Geist, T., Kuntze, M., ...

Proc.of the 8th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Gut-Ising, October 19-21, 1992

Gyrotron cavities with reduced mode conversion. (1993)

Thumm, M., Dumbrajs, O.

Proc.of the 2nd Internat.Workshop on Electron Cyclotron Resonance Heating Transmission Systems, San Diego, Calif., December 9-11, 1992

Development of a 0.5 MW/140 GHz gyrotron oscillator for fusion plasma applications. (1993)

Nickel, H.U., Borie, E., Dammertz, G., Dumbrajs, O., Gantenbein, G., Kuntze, M., ...

Mikrowellen und Optronik : 7. Kongressmesse fuer Hoechstfrequenztechnik, Sindelfingen, 25.-27.Mai 1993 ; Conf.Proc S.423-27

The 140 GHz beam transmission system for ECRH a W7-AS: recent developments and operational experience. (1993)

Kasparek, W., Kopp, K.W., Mueller, G.A., Schueller, P.G., Erckmann, V., Baumgaertner, H., ...

Proc.of the 2nd Internat.Workshop on Electron Cyclotron Resonance Heating Transmission Systems, San Diego, Calif., December 9-11, 1992

Entwicklung von 140 GHz gyrotrons hoher Leistung am KfK. (1992)

Piosczyk, B., Borie, E., Dammertz, G., Dumbrajs, O., Gantenbein, G., Geist, T., ...

Vakuumelektronik und Displays : Vortraege der ITG-Fachtagung, Garmisch-Partenkirchen, 4.-5.Mai 1992

The 140 GHz TE10,4 gyrotron at KfK, present status and near future prospects. (1992)

Baumgaertner, H., Borie, H., Budig, H., Dammertz, G., Dumbrajs, O., Gantenbein, G., ...

Proc.of the 4th Russian-German Meeting on ECRH and Gyrotrons, Nizhny Novgorod, GUS, May 15-17, 1992

Optimization of high order volume mode cavities with respect to mode conversion and mode competition. (1992)

Dumbrajs, O., Gantenbein, G., Thumm, M.

Proc.of the 4th Russian-German Meeting on ECRH and Gyrotrons, Nizhny Novgorod, GUS, May 15-17, 1992

A cavity with reduced mode conversion for gyrotrons. (1992)

Thumm, M., Dumbrajs, O., Pretterebner, J., Wagner, D.

International Journal of Infrared and Millimeter Waves, 13(1992) S.825-40

Development of high power 140 GHz gyrotrons for fusion plasma applications. (1992)

Thumm, M., Borie, E., Dammertz, G., Dumbrajs, O., Gantenbein, G., Geist, T., ...

IEE Colloquium on New Developments and Applications of Microwave Tubes, London, GB, April 13, 1992

Resonator for a frequency-step tunable gyrotron. (1990)

Dumbrajs, O., Piosczyk, B.

International Journal of Electronics, 68(1990) S.885-90

Experimental results of the KfK 140 GHz gyrotron. (1990)

Borie, E., Dammertz, G., Dumbrajs, O., Gantenbein, G., Geist, T., Hochschild, G., ...

2nd Joint USSR-FRG Meeting on ECRH and Gyrotrons, Moskva, SU, June 18-23, 1990

Design of high power gyrotrons for KfK. (1990)

Borie, E., Dammertz, G., Dumbrajs, O., Gantenbein, G., Geist, T., Hochschild, G., ...

2nd Joint USSR-FRG Meeting on ECRH and Gyrotrons, Moskva, SU, June 18-23, 1990

Possible operation of the KfK gyrotron at harmonics. (1989)

Dumbrajs, O., Wenzelburger, H.

International Journal of Infrared and Millimeter Waves, 9(1988) S.1067-86

Resonator with a curved wall for a gyrotron. (1989)

Dumbrajs, O., Wenzelburger, H.

IEEE Transactions on Plasma Science, 17(1989) S.840-43

A complex cavity with mode conversion for gyrotrons. (1988)

Dumbrajs, O., Borie, E.

International Journal of Electronics, 65(1988) S.285-95

Complex cavity with mode conversion for gyrotrons. (1988)

Dumbrajs, O., Borie, E.

International Journal of Electronics, 65(1988) S.285

Mode competition in a complex cavity for gyrotrons. (1987)

Dumbrajs, O., Joedicke, B.

12th Annual Internat.Conf.on Infrared and Millimeter Waves, Lake Buena Vista, Fla., December 14-18, 1987

Calculation of eigenmodes of tapered gyrotron resonators. (1986)

Borie, E., Dumbrajs, O.

International Journal of Electronics, 60(1986) S.143-54

Parameter studies for a 150 GHz gyrotron at KfK. (1986)

Borie, E., Dumbrajs, O., Joedicke, B.

10th Annual Internat.Conf.on Infrared and Millimeter Waves, Lake Buena Vista, Fla., December 8-13, 1985

A complex cavity with mode conversion for gyrotrons. (1986)

Borie, E., Dumbrajs, O.

11th Annual Internat.Conf.on Infrared and Millimeter Waves, Pisa, I, October 25-30, 1986