M. Maraschek

Details der Publikationsliste

Zeitraum

1997 - 2009

Anzahl

469

Co-Autoren

Direct observation of current in type I ELM filaments on Asdex Upgrade (2009)

Vianello, N., Naulin, V., Schrittwieser, R., Muller, H. W., Zuin, M., Ionita, C., ...

Magnetically confined plasmas are often subject to relaxation oscillations accompanied by large transport events. This is particularly the case for the high confinement regime of tokamaks where these...

Bayesian analysis of magnetic island dynamics (2007)

R. Preuss, M. Maraschek, H. Zohm, V. Dose

The dynamics of neoclassical tearing modes (NTM) is theoretically described by the general-ized Rutherford equation for the magnetic island width [1, 2]: where µ0r τR τR

Plasma stability enhancement using EC-RH/CD in ASDEX upgrade. (2007)

Manini, A., Behler, K., Giannone, L., Hicks, N., Leuterer, F., Maraschek, M., ...

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

Overview of ASDEX Upgrade results-development of integrated operating scenarios for ITER (2005)

Günter,S., Angioni,C., Apostoliceanu,M., Atanasiu,C., Balden,M., Becker,G., ...

This article based on the 2004 Fusion Energy Conference contribution (Vilamoura, Portugal, 1-6 November 2004)

Overview of ASDEX Upgrade results-development of integrated operating scenarios for ITER (2005)

Günter, S., Angioni, C., Apostoliceanu, M., Atanasiu, C., Balden, M., Becker, G., ...

This article based on the 2004 Fusion Energy Conference contribution (Vilamoura, Portugal, 1-6 November 2004)

Studies of the 'Quiescent H-mode' regime in ASDEX Upgrade and JET (2005)

Suttrop, W., Hynonen, V., Kurki-Suonio, T., Lang, P. T., Maraschek, M., Neu, R., ...

The stationary edge localized mode (ELM)-free 'Quiescent H-mode' (QH-mode) regime, obtained with counter neutral beam injection, is studied in ASDEX Upgrade and Joint European Torus. QH-mode plasmas...

Sawtooth control experiments on ASDEX Upgrade (2005)

Muck, I., Goodman, T. P., Maraschek, M., Pereverzev, G. P., Ryter, F., Zohm, H.

In a fusion device, the so-called sawtooth instability can lead to the triggering of confinement limiting neoclassical tearing modes. On the other hand, the existence of sawteeth is desirable for the...

Active control of MHD instabilities by ECCD in ASDEX upgrade (2005)

Maraschek, M., Gantenbein, G., Goodman, T. P., Gunter, S., Howell, D. F., Leuterer, F., ...

The modification of the stability and the behaviour of core MHD with local electron cyclotron current drive (ECCD) is presented. Starting from the innermost resonant surface, the q = 1 surface, the...

Integrated exhaust scenarios with actively controlled ELMs (2005)

Lang, P. T., Kallenbach, A., Bucalossi, J., Conway, G. D., Degeling, A., Dux, R., ...

An integrated radiative high performance scenario has been established at ASDEX Upgrade based on simultaneous feedback control of the average divertor neutral particle and power flux in combination...

Local 3D perturbation experiments for probing the ELM stability (2005)

Lang, P. T., Hobirk, J., Horton, L. D., Kallenbach, A., Maraschek, M., Mertens, V., ...

Empirical estimates indicate that the transient divertor power load induced by type-I ELMs in the standard H-mode ITER scenario might result in intolerably short target life times. Significant...

Frequency control of type-I ELMs by magnetic triggering in ASDEX Upgrade (2004)

Lang, P. T., Degeling, A. W., Lister, J. B., Martin, Y. R., McCarthy, P. J., Sips, A. C. C., ...

Magnetic triggering of edge localized modes (ELMs) was reported first from TCV in ohmic plasmas showing type-III ELMs. This method, showing successful locking of the ELM frequency to an imposed...

ELM frequency control by continuous small pellet injection in ASDEX Upgrade (2003)

Lang,P. T., Neuhauser,J., Horton,L. D., Eich,T., Fattorini,L., Fuchs,J. C., ...

Injection of cryogenic deuterium pellets has been successfully applied in ASDEX Upgrade for external edge localized mode (ELM) frequency control in type-I ELMy H-mode discharge scenarios. A pellet...

ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak (2003)

Suttrop,W., Maraschek,M., Conway,G. D., Haas,G., Horton,L. D., ...

ELM-free H-mode plasmas with stationary plasma density and radiation level are obtained in the ASDEX Upgrade tokamak with large clearance between the last closed flux surface and the wall, and...

Neoclassical tearing modes on ASDEX Upgrade: improved scaling laws, high confinement at high βN and new stabilization experiments (2003)

Günter,S., Gantenbein,G., Gude,A., Igochine,V., Maraschek,M., Mück,A., ...

In this paper, recent results on the physics of neoclassical tearing modes (NTMs) achieved on ASDEX Upgrade are reported. A scaling law for NTM decay has been found, showing that the minimum local...

Recent ECRH results in ASDEX Upgrade (2003)

Leuterer,F., Dux,R., Gantenbein,G., Goddman,T., Hobirk,J., Imbeaux,F., ...

We report about experiments in ASDEX Upgrade using our ECRH system with f = 140 GHz, P = 4 x 0.5 MW, and T = 2 sec. The following topics are covered: studies of modulated power deposition, studies of...

Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks (2003)

Joffrin,E., Challis,C. D., Conway,G. D., Garbet,X., Gude,A., Günter,S., ...

The formation of internal transport barriers (ITBs) has been experimentally associated with the presence of rational q surfaces in both JET and ASDEX Upgrade. The triggering mechanisms are related to...

Tolerable ELMs in conventional and advanced scenarios at ASDEX Upgrade (2003)

Gruber,O., Günter,S., Herrmann,A., Horton,L. D., Lang,P. T., Maraschek,M., ...

Recent ASDEX Upgrade experiments integrated benign type II ELMs (tolerable peak heat loads on target plates) with high performance. In both conventional and advanced H-modes, the operation window...

Neoclassical tearing modes on AUG: improved scaling laws, high confinement at high βN and new stabilization experiments (2003)

Günter,S., Gantenbein,G., Gude,A., Igochine,V., Maraschek,M., Sauter,O., ...

The accuracy of the scaling laws derived so far for the normalised beta values at the onset of neoclassical tearing modes is limited as the results depend on the presence and magnitude of seed...

Investigation of complex MHD activity by a combined use of various diagnostics (2003)

Igochine,V., Günter,S., Maraschek,M.

A new combined method for investigation of magnetohydrodynamic (MHD) activity in fusion experiments is proposed. The main advantages of this approach are the possibility of a direct comparison of...

MHD limits to tokamak operation and their control (2003)

Zohm,H., Gantenbein,G., Isayama,A., Keller,A., La Haye,R. J., Maraschek,M., ...

A review of magnetohydrodynamic limits to tokamak operation in terms of current, density and pressure is given. Although the current and density limits in a tokamak usually lead to disruptive...

Sawtooth, neo-classical tearing mode and error field studies in JET (2003)

Hender,T. C., Sauter,O., Alper,B., Angioni,C., De Baar,M. R., De Benedetti,M., ...

A range of ITER relevant plasma stability issues has been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawtooth seeds, scaling of m=2, n=1...

Disruption studies in ASDEX Upgrade (2003)

Pautasso,G., Egorov,S., Finken,K. H., Gruber,O., Herrmann,A., Fuchs,C. J., ...

Disruption generate large thermal and mechanical stresses on the tokamak components. For a future reactor disruptions have a significant impact on the design since all loading conditions must be...

Overview of ASDEX Upgrade results (2003)

Zohm,H., Angioni,C., Arslanbekov,R., Atanasiu,C., Becker,G., Becker,W., ...

Recent results from the ASDEX Upgrade experimental campaigns 2001 and 2002 are presented. An improved understanding of energy and particle transport emerges in terms of a 'critical gradient' model...

ELM frequency control by continuous small pellet injection in ASDEX Upgrade (2003)

Lang, P. T., Neuhauser, J., Horton, L. D., Eich, T., Fattorini, L., Fuchs, J. C., ...

Injection of cryogenic deuterium pellets has been successfully applied in ASDEX Upgrade for external edge localized mode (ELM) frequency control in type-I ELMy H-mode discharge scenarios. A pellet...

ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak (2003)

Suttrop, W., Maraschek, M., Conway, G. D., Haas, G., Horton, L. D., ...

ELM-free H-mode plasmas with stationary plasma density and radiation level are obtained in the ASDEX Upgrade tokamak with large clearance between the last closed flux surface and the wall, and...

Neoclassical tearing modes on ASDEX Upgrade: improved scaling laws, high confinement at high βN and new stabilization experiments (2003)

Günter, S., Gantenbein, G., Gude, A., Igochine, V., Maraschek, M., Mück, A., ...

In this paper, recent results on the physics of neoclassical tearing modes (NTMs) achieved on ASDEX Upgrade are reported. A scaling law for NTM decay has been found, showing that the minimum local...

Recent ECRH results in ASDEX Upgrade (2003)

Leuterer, F., Dux, R., Gantenbein, G., Goddman, T., Hobirk, J., Imbeaux, F., ...

We report about experiments in ASDEX Upgrade using our ECRH system with f = 140 GHz, P = 4 x 0.5 MW, and T = 2 sec. The following topics are covered: studies of modulated power deposition, studies of...

Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks (2003)

Joffrin, E., Challis, C. D., Conway, G. D., Garbet, X., Gude, A., Günter, S., ...

The formation of internal transport barriers (ITBs) has been experimentally associated with the presence of rational q surfaces in both JET and ASDEX Upgrade. The triggering mechanisms are related to...

Tolerable ELMs in conventional and advanced scenarios at ASDEX Upgrade (2003)

Gruber, O., Günter, S., Herrmann, A., Horton, L. D., Lang, P. T., Maraschek, M., ...

Recent ASDEX Upgrade experiments integrated benign type II ELMs (tolerable peak heat loads on target plates) with high performance. In both conventional and advanced H-modes, the operation window...

Neoclassical tearing modes on AUG: improved scaling laws, high confinement at high βN and new stabilization experiments (2003)

Günter, S., Gantenbein, G., Gude, A., Igochine, V., Maraschek, M., Sauter, O., ...

The accuracy of the scaling laws derived so far for the normalised beta values at the onset of neoclassical tearing modes is limited as the results depend on the presence and magnitude of seed...

Investigation of complex MHD activity by a combined use of various diagnostics (2003)

Igochine, V., Günter, S., Maraschek, M., ASDEX Upgrade Team

A new combined method for investigation of magnetohydrodynamic (MHD) activity in fusion experiments is proposed. The main advantages of this approach are the possibility of a direct comparison of...

MHD limits to tokamak operation and their control (2003)

Zohm, H., Gantenbein, G., Isayama, A., Keller, A., La Haye, R. J., Maraschek, M., ...

A review of magnetohydrodynamic limits to tokamak operation in terms of current, density and pressure is given. Although the current and density limits in a tokamak usually lead to disruptive...

Sawtooth, neo-classical tearing mode and error field studies in JET (2003)

Hender, T. C., Sauter, O., Alper, B., Angioni, C., De Baar, M. R., De Benedetti, M., ...

A range of ITER relevant plasma stability issues has been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawtooth seeds, scaling of m=2, n=1...

Disruption studies in ASDEX Upgrade (2003)

Pautasso, G., Egorov, S., Finken, K. H., Gruber, O., Herrmann, A., Fuchs, C. J., ...

Disruption generate large thermal and mechanical stresses on the tokamak components. For a future reactor disruptions have a significant impact on the design since all loading conditions must be...

Overview of ASDEX Upgrade results (2003)

Zohm, H., Angioni, C., Arslanbekov, R., Atanasiu, C., Becker, G., Becker, W., ...

Recent results from the ASDEX Upgrade experimental campaigns 2001 and 2002 are presented. An improved understanding of energy and particle transport emerges in terms of a 'critical gradient' model...

Overview of ASDEX upgrade results (2003)

Zohm, H., Angioni, C., Arslanbekov, R., Atanasiu, C., Becker, G., Becker, W., ...

Recent results from the ASDEX Upgrade experimental campaigns 2001 and 2002 are presented. An improved understanding of energy and particle transport emerges in terms of a 'critical gradient' model...

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...

Scaling of the marginal beta(p) of neoclassical tearing modes during power ramp-down experiments in ASDEX Upgrade (2003)

Maraschek, M., Sauter, O., Gunter, S., Zohm, H.

Based on the models describing the behaviour of neoclassical tearing modes (NTMs), fits for the seed-island triggered excitation and disappearance of these modes at small beta-values have been tested...

Neoclassical tearing modes on ASDEX upgrade: improved scaling laws, high confinement at high, beta N and new stabilization experiments (2003)

Gunter, S., Gantenbein, G., Gude, A., Igochine, V., Maraschek, M., Muck, A., ...

In this paper, recent results on the physics of neoclassical tearing modes (NTMs) achieved on ASDEX Upgrade are reported. A scaling law for NTM decay has been found, showing that the minimum local...

Bayesian Analysis of Magnetic Island Dynamics (2003)

R. Preuss, M. Maraschek, H. Zohm, V. Dose

We examine a first order differential equation with respect to time used to describe magnetic islands in magnetically confined plasmas. The free parameters of this equation are obtained by employing...

Steady state advanced scenarios at ASDEX Upgrade (2002)

Sips,A.C.C., Arslanbekov,R., Atanasiu,C., Becker,W., Becker,G., Behler,K., ...

Recent experiments at ASDEX Upgrade have achieved advanced scenarios with high beta(N) (> 3) and confinement enhancement over ITER98(y, 2) scaling, H-H98y2 = 1.1-1.5, in steady state. These...

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...

Bayesian analysis of magnetic island dynamics (2002)

Preuss, R., Maraschek, M., Zohm, H., Dose, V.

We examine a first order differential equation with respect to time coming up in the description of magnetic islands in magnetically confined plasmas. The free parameters of this equation are...

Temporal evolution of neoclassical tearing modes and its effect on confinement reduction in ASDEX Upgrade (2002)

Gude,A., Günter,S., Maraschek,M., Zohm,H.

It is shown that (3,2) neoclassical tearing modes (NTMs) in ASDEX Upgrade can, under similar external control parameters, occur at significantly different values of beta(N), with the NTMs occurring...

q=1 advanced tokamak experiments in JET and comparison with ASDEX Upgrade (2002)

Joffrin,E., Wolf,R., Alper,B., Baranov,Y., Challis,C. D., De Baar,M., ...

The ASDEX Upgrade advanced tokamak scenario with central q close to 1 has been reproduced on JET. For almost identical q profiles, the comparative analysis does show similar features like the...

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 ß plasmoid formation, drift and striations during pellet ablation in ASDEX Upgrade (2002)

Müller,H. W., Dux,R., Kaufmann,M., Lang,P. T., Lorenz,A., Maraschek,M., ...

The ablated material of a frozen hydrogen isotope pellet which is injected into a hot tokamak plasma forms a high beta plasmoid. This diamagnetic plasmoid is accelerated to the magnetic low field...

On-line prediction and mitigation of disruptions in ASDEX Upgrade (2002)

Pautasso,G., Tichmann,C., Egorov,S., Zehetbauer,T., Gruber,O., Maraschek,M., ...

An on-line predictor of the time to disruption has been installed on the ASDEX Upgrade tokamak. It is suitable either for avoidance of disruptions or for mitigation of those that are unavoidable. The...

Temporal evolution of neoclassical tearing modes and its effect on confinement reduction in ASDEX Upgrade (2002)

Gude, A., Günter, S., Maraschek, M., Zohm, H.

It is shown that (3,2) neoclassical tearing modes (NTMs) in ASDEX Upgrade can, under similar external control parameters, occur at significantly different values of beta(N), with the NTMs occurring...

q=1 advanced tokamak experiments in JET and comparison with ASDEX Upgrade (2002)

Joffrin, E., Wolf, R., Alper, B., Baranov, Y., Challis, C. D., De Baar, M., ...

The ASDEX Upgrade advanced tokamak scenario with central q close to 1 has been reproduced on JET. For almost identical q profiles, the comparative analysis does show similar features like the...

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...

High ß plasmoid formation, drift and striations during pellet ablation in ASDEX Upgrade (2002)

Müller, H. W., Dux, R., Kaufmann, M., Lang, P. T., Lorenz, A., Maraschek, M., ...

The ablated material of a frozen hydrogen isotope pellet which is injected into a hot tokamak plasma forms a high beta plasmoid. This diamagnetic plasmoid is accelerated to the magnetic low field...

On-line prediction and mitigation of disruptions in ASDEX Upgrade (2002)

Pautasso, G., Tichmann, C., Egorov, S., Zehetbauer, T., Gruber, O., Maraschek, M., ...

An on-line predictor of the time to disruption has been installed on the ASDEX Upgrade tokamak. It is suitable either for avoidance of disruptions or for mitigation of those that are unavoidable. The...

Steady state advanced scenarios at ASDEX Upgrade (2002)

Sips, A.C.C., Arslanbekov, R., Atanasiu, C., Becker, W., Becker, G., Behler, K., ...

Recent experiments at ASDEX Upgrade have achieved advanced scenarios with high beta(N) (> 3) and confinement enhancement over ITER98(y, 2) scaling, H-H98y2 = 1.1-1.5, in steady state. These...

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

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

This version is available at the following URL: http://dx.doi.org/10.1088/0029-5515/42/4/303

High density operation at JET by pellet refueling (2002)

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

This version is available at the following Publisher URL: http://dx.doi.org/10.1088/0741-3335/44/9/310

Sawtooth, Neo-Classical Tearing Mode and Error Field Studies in JET (2002)

T.C. Hender, O. Sauter, B. Alper, C. Angioni, M. Baar, M. Benedetti, ...

A range of ITER relevant plasma stability issues have been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawteeth seeds, scaling of (2,1)...

Observations of the Onset of the Energy Quench in ASDEX Upgrade Density Limit Disruptions (2002)

Francisco Salzedas, G. Pautasso, I. Nunes, W. Suttrop, M. Maraschek, M. E. Manso, ...

Tokamak major density limit disruptions are usually preceded by a m/n=2/1 tearing mode, that may or may not lock to the vessel wall. The complete destruction of energy confinement in these major...

Neoclassical tearing modes (2000)

Buttery, R. J., Gunter, S., Giruzzi, G., Hender, T. C., Howell, D., Huysmans, G., ...

Neoclassical tearing modes are one of the most serious concerns for operation on a next-step tokamak device. The modes occur on present tokamaks at normalized pressure (beta (N)) values comparable to...