J. Ongena

Publication List Details

Period

1990 - 2009

Number

106

Co-Authors

ITER-relevant Heating and Current Drive Studies on JET (2008)

Ongena, J., Baranov, Yu, Bobkov, V.

22nd IAEA Fusion Energy Conference, Geneva, Switzerland, October 13-18, 2008

Energy for future centuries - Prospects for fusion power as a future energy source (2008)

Ongena, J., Van Oost, Guido

The current power consumption in different parts of the world and an estimate of the future energy needs of the world are given. The present energy supplies and prospects, the possible consequences...

Association"EURATOM- Belgian State" (2007)

J. Ongena, G. Van Oost

The current power consumption in different parts of the world and an estimate of the future energy needs of the world are given. The present energy supplies and prospects, the possible consequences...

Recent progress on the development and analysis of the ITPA global H-mode confinement database (2007)

McDonald, D. C., Cordey, J. G., Thomsen, K., Kardaun, Ojwf, Snipes, J. A., Greenwald, M., ...

This paper describes the updates to and analysis of the International Tokamak Physics Activity (ITPA) Global H-Mode Confinement Database version 3 (DB3) over the period 1994-2004. Global data, for...

The role of aspect ratio and beta in H-mode confinement scalings (2006)

Kaye, S. M., Valovic, M., Chudnovskiy, A., Cordey, J. G., McDonald, D., Meakins, A., ...

The addition of high power, low aspect ratio data from the NSTX and MAST experiments has motivated a new investigation of the effect of aspect ratio on confinement scaling. Various statistical...

Impurity-seeded ELMy H-modes in JET, with high density and reduced heat load (2005)

Monier-Garbet, P, Andrew, P, Belo, P, Bonheure, G, Corre, Y, Crombe, K, ...

Experiments performed at JET during the past two years show that, in high triangularity H-mode plasmas with I-p = 2.5 MA, n(e)/n(Gr) approximate to 1.0, it is possible to radiate separately up to...

Poloidal rotation dynamics, radial electric field, and neoclassical theory in the jet internal-transport-barrier region (2005)

Crombe, K, Andrew, Y, Brix, M, Giroud, C, Hacquin, S, Hawkes, N, ...

Results from the first measurements of a core plasma poloidal rotation velocity (v(theta)) across internal transport barriers (ITB) on JET are presented. The spatial and temporal evolution of the ITB...

Overview of transport, fast particle and heating and current drive physics using tritium in JET plasmas (2005)

Stork, D., Baranov, Y., Belo, P., Bertalot, L., Borba, D., Brzozowski, J. H., ...

Results are presented from the JET Trace Tritium Experimental (TTE) campaign using minority tritium (T) plasmas (n(T)/n(D) < 3%). Thermal tritium particle transport coefficients (D-T, nu(T)) are...

Overview of recent JET results in preparation for ITER operation: Interplay between technical and scientific progress (2005)

Pamela, J., Ongena, J., Borba, D., Buttery, R., Counsell, G., Felton, R., ...

Recent scientific and technical progress on JET is summarized. The scientific programme on JET over the last 2 years has benefited significantly from various technological developments: advanced real...

Scaling of the energy confinement time with beta and collisionality approaching ITER conditions (2005)

Cordey, J. G., Thomsen, K., Chudnovskiy, A., Kardaun, Ojwf, Takizuka, T., Snipes, J. A., ...

The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address...

Tritium transport experiments on the JET tokamak (2004)

Zastrow, K. D., Adams, J. M., Baranov, Y., Belo, P., Bertalot, L., Brzozowski, J. H., ...

An overview is given of the experimental method, the analysis technique and the results for trace tritium experiments conducted on the JET tokamak in 2003. Observations associated with events such as...

Towards the realization on JET of an integrated H-mode scenario for ITER (2004)

Ongena, J., Monier-Garbet, P., Suttrop, W., Andrew, P., Becoulet, M., Budny, R., ...

ELMy H-mode experiments at JET in 2000/mid-2002 have focused on discharges with normalized parameters for plasma density, energy confinement and beta similar to those of the ITER Q(DT) = 10 reference...

ELMy H-modes in JET helium-4 plasmas (2004)

McDonald, C., Cordey, J. G., Righi, E., Ryter, F., Saibene, G., Sartori, R., ...

ELMy H-modes in helium-4 plasmas provide valuable information on ELMy H-mode physics as well as a possible early low activation operational phase for next-step tokamaks, such as ITER. With this in...

Impurity-seeded plasma experiments on JET (2003)

Maddison, G. P., Brix, M., Budny, R., Charlet, M., Coffey, I., Cordey, J. G., ...

Scaling to larger tokamaks of high confinement plasmas with radiating edges, induced by impurities, is being studied through internationally collaborative experiments on JET. In campaigns till the...

Role of sawtooth in avoiding impurity accumulation and maintaining good confinement in JET radiative mantle discharges (2003)

Nave, M. F. F., Rapp, J., Bolzonella, T., Dux, R., Mantsinen, M. J., Budny, R., ...

Impurity injection in the JET ELMy H-mode regime has produced high-confinement, quasi-steady-state plasmas with densities close to the Greenwald density. However, at large Ar densities, a sudden loss...

Towards the realization on JET of an integrated H-mode scenario for ITER (2003)

Ongena, J., Monier-Garbet, P., Suttrop, W., Andrew, P., Bécoulet, M., Budny, R., ...

ELMy H-Mode experiments at JET since 2000 have focussed on the steady state and simultaneous realization of the ITER QDT=10 requirements in the normalized parameters for density, confinement and...

Simulation of the time behaviour of impurities in JET Ar-seeded discharges and its relation with sawtoothing and RF heating (2003)

Puiatti, M. E., Valisa, M., Mattioli, M., Bolzonella, T., Bortolon, A., Coffey, I., ...

In JET, Ar seeding has proven to be a successful means to reach quasi-stationary regimes that feature, simultaneously, high density, high confinement and an edge radiation belt without significant...

Reduction of divertor heat load in JET ELMy H-modes using impurity seeding techniques (2003)

Rapp, J., Monier-Garbet, P., Andrew, P., Dumortier, P., Eich, T., Fundamenski, W., ...

One of the most severe problems for fusion reactors is the power load on the divertor target plates. In order to reduce the power load in the divertor radiation cooling by seeding of impurities is...

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...

Integrated scenario in JET using real-time profile control (2003)

Joffrin, E., Crisanti, F., Felton, R., Litaudon, X., Mazon, D., Moreau, D., ...

The recent development of real-time measurements and control tools in JET has enhanced the reliability and reproducibility of the relevant ITER scenarios. Diagnostics such as charge exchange,...

Confinement properties of high density impurity seeded ELMy H- mode discharges at low and high triangularity on JET (2002)

Dumortier, P., Andrew, P., Bonheure, G., Budny, R. V., Buttery, R., Charlet, M., ...

The design value for ITER is based on operation at n/n(GW) = 0.85, beta(n) = 1.8 and H98(y, 2) = 1. These values have been routinely achieved in JET in argon seeded ELMy H-mode discharges in...

Seeding of impurities in JET H-mode discharges to mitigate the impact of ELMs (2002)

Jachmich, S., Maddison, G., Beurskens, M. N. A., Dumortier, P., Eich, T., Messiaen, A., ...

ELMy H-mode is one of the foreseen operational scenarios for ITER-FEAT. Good confinement and density is usually associated with Type I ELMs, which, however, will have a severe impact on the divertor...

Optimization of pellet scenarios for long pulse fuelling to high densities at JET (2002)

Lang, P. T., Alper, B., Baylor, L. R., Beurskens, M., Cordey, J. G., Dux, R., ...

Pellet injection was investigated for its fuelling capability to high densities in ELMy H mode discharges at JET. Applying the high field side launch system, optimized refuelling scenarios were...

High density operation at JET by pellet refuelling (2002)

Lang, P. T., Alper, B., Baylor, L. R., Beurskens, M., Cordey, J. G., Dux, R., ...

Several approaches are used at JET to achieve operation at high density with good energy confinement. One of them is the injection of solid fuel pellets to realize efficient particle refuelling by...

Characteristics and scaling of energy and particle losses during Type I ELMs in JET H-modes (2002)

Loarte, A., Becoulet, M., Saibene, G., Sartori, R., Campbell, D. J., Eich, T., ...

Recent experiments on the Type I ELMy H-mode regime performed at JET with improved diagnostics have expanded the range of parameters for the study of Type I ELM energy and particle losses. Deviations...

High density, high performance high-confinement-mode plasmas in the Joint European Torus (JET) (2002)

Suttrop, W., Ongena, J., Becoulet, M., Cordey, J. G., Dumortier, P., Huysmans, G. T. A., ...

Recent experiments at the Joint European Torus [Rebut , Fusion Eng. Des. 22, 7 (1993)] aim to improve confinement quality in high-confinement-mode (H-mode) plasmas at high densities. Energy...

Long timescale density peaking in JET (2002)

Valovic, M., Rapp, J., Cordey, J. G., Budny, R., McDonald, D. C., Garzotti, L., ...

Long timescale density peaking has been observed in JET plasmas leading to densities exceeding the Greenwald value. These neutral beam heated discharges are characterized by type-I ELMS and good...

High density, high performance high-confinement-mode plasmas in the Joint European Torus (JET) (2002)

Suttrop, W., Ongena, J., Becoulet, M., Cordey, J. G., Dumortier, P., Huysmans, G. T. A., ...

Recent experiments at the Joint European Torus [Rebut , Fusion Eng. Des. 22, 7 (1993)] aim to improve confinement quality in high-confinement-mode (H-mode) plasmas at high densities. Energy...

Recent progress on JET towards the ITER reference mode of operation at high density (2001)

Ongena, J., Suttrop, W., Becoulet, M., Cordey, G., Dumortier, P., Eich, T., ...

Recent progress towards obtaining high density and high confinement in JET as required for the ITER reference scenario at Q = 10 is summarized. Plasmas with simultaneous confinement H-98(y.2) = 1 and...

Predictive modelling of JET plasmas with edge and core transport barriers (2001)

Parail, V., Baranov, Y., Becoulet, A., Castaldo, C., Corriga, G., Challis, C., ...

Proceedings of the 28th EPS Conference on 28th EPS Conference on Controlled Fusion and Plasma Physics. Funchal, Madeira, PT, 18 - 22 June 2001. Europhysics Conference Abstracts, Contributed Papers...

Improved Confinement with Edge Radiative Cooling at High Densities and High Heating Power in TEXTOR (1994)

Messiaen, A. M., Ongena, J., Samm, U., Unterberg, B., Vandenplas, P.E., Van Oost, G., ...

This version is available at http://dx.doi.org/10.1088/0029-5515/34/6/I06 Copyright © IOP Publishing Ltd.

Improved Confinement in TEXTOR (1993)

Ongena, J., Conrads, H., Gaigneaux, M., Messiaen, A. M., Weynants, R. R., Barbian, E., ...

This version is available at http://dx.doi.org/10.1088/0029-5515/33/2/I08 Copyright © IOP Publishing Ltd.

High Power ICRH and NB Heating Results in TEXTOR (1990)

Messiaen, A. M., Conrads, H., Gaigneaux, M., Ongena, J., Weynants, R. R., Bertschinger, G., ...

This version is available at http://dx.doi.org/10.1088/0741-3335/32/11/005 Copyright © IOP Publishing Ltd.