Scientific Commons: H. Ehmler

island divertor operation and the modelling of the results with the EMC3/EIRENE code- confinement issues with emphasis on the differences to tokamaks (isotope effect, density scaling, lack of profile...

Island divertor experiments on the Wendelstein 7-AS stellarator (2007)

K. Mccormick, P. Grigull, R. Burhenn, R. Brakel, H. Ehmler, Y. Feng, ...

A new edge-based energy scaling law for W7-AS and its implications for boundary-island divertor operation (2007)

McCormick, K., Grigull, P., Ehmler, H., Pasch, E., NBI Team, ECRH Team, ...

Review of the acceptance tests of the W7-X superconducting magnets (2007)

Ehmler, H., Baldzuhn, J., Genini, L., Heyn, K., Sborchia, C., Schild, T., ...

AC modeling and impedance spectrum tests of the superconducting magnetic field coils for the Wendelstein 7-X fusion experiment (2007)

Ehmler, H., Koeppen, M.

Transport of Impurity Ions in the Wendelstein 7-AS Stellarator Plasma (2006)

Burhenn,R., Baldzuhn,J., Beidler,C., Brakel,R., Ehmler,H., Giannone,L., ...

Transport of Impurity Ions in the Wendelstein 7-AS Stellarator Plasma (2006)

Burhenn, R., Baldzuhn, J., Beidler, C., Brakel, R., Ehmler, H., Giannone, L., ...

Dynamics of poloidal flows and turbulence at the H-mode transition in W7-AS (2006)

Hirsch, M., Baldzuhn, J., Ehmler, H., Holzhauer, E., Wagner, F.

H-mode operational conditions and plasma edge rotation in W7-AS (2006)

Hirsch, M., Baldzuhn, J., Ehmler, H., Grigull, P., Holzhauer, E., Wagner, F., ...

Recent Results of the Cold Tests Performed on the Stellarator W7-X Coils (2006)

Baldzuhn, J., Ehmler, H., Hoelting, A., Sborchia, C., Hertel, K., Genini, L., ...

Comperative Analysis of Impulse and Impedance Tests to Detect Short Circuits within the W7-X Magnets (2006)

Ehmler, H., Fillunger, H., Baldzuhn, J., Maix, R. K., Jeckle, A., Parodi, S., ...

Manufacture and test of the non-planar coils for Wendelstein 7-X (2005)

Rummel,Th., Risse,K., Ehmler,H.

W7-AS: One step of the Wendelstein stellarator line (2005)

Wagner,F., Baeumel,S., Baldzuhn,J., Basse,N., Brakel,R., Burhenn,R., ...

Neutral pressure behavior for diverted discharges in the Wendelstein 7-AS Stellarator (2005)

McCormick,K., Grigull,P., Burhenn,R., Ehmler,H., Feng,Y., Giannone,L., ...

Physics, Technologies and Status of the Wendelstein 7-X Device (2005)

Wagner,F., Andreeva,T., Baldzuhn,J., Benndorf,A., Bolt,H., Boscary,J., ...

Manufacture and test of the non-planar coils for Wendelstein 7-X (2005)

Rummel, Th., Risse, K., Ehmler, H.

W7-AS: One step of the Wendelstein stellarator line (2005)

Wagner, F., Baeumel, S., Baldzuhn, J., Basse, N., Brakel, R., Burhenn, R., ...

Neutral pressure behavior for diverted discharges in the Wendelstein 7-AS Stellarator (2005)

McCormick, K., Grigull, P., Burhenn, R., Ehmler, H., Feng, Y., Giannone, L., ...

Physics, Technologies and Status of the Wendelstein 7-X Device (2005)

Wagner, F., Andreeva, T., Baldzuhn, J., Benndorf, A., Bolt, H., Boscary, J., ...

Dynamics of poloidal flows and turbulence at the H-mode transition in W7-AS (2004)

Hirsch,M., Ehmler,H., Baldzuhn,J., Holzhauer,E., Wagner,F.

Divertors for Helical Devices: Concepts, Plans, Results, and Problems (2004)

König,R., Grigull,P., McCormick,K., Feng,Y., Ehmler,H., Gadelmeier,F., ...

Impurity Transport Studies in the Wendelstein 7-AS Stellarator (2004)

Burhenn,R., Baldzuhn,J., Brakel,R., Ehmler,H., Giannone,L., Grigull,P., ...

Lithium beam charge exchange diagnostic for edge ion temperature measurements at the ASDEX Upgrade tokamak (2004)

Reich,M., Wolfrum,E., Schweinzer,J., Ehmler,H., Horton,L. D., Neuhauser,J., ...

Dynamics of poloidal flows and turbulence at the H-mode transition in W7-AS (2004)

Hirsch, M., Ehmler, H., Baldzuhn, J., Holzhauer, E., Wagner, F.

Divertors for Helical Devices: Concepts, Plans, Results, and Problems (2004)

König, R., Grigull, P., McCormick, K., Feng, Y., Ehmler, H., Gadelmeier, F., ...

Impurity Transport Studies in the Wendelstein 7-AS Stellarator (2004)

Burhenn, R., Baldzuhn, J., Brakel, R., Ehmler, H., Giannone, L., Grigull, P., ...

Lithium beam charge exchange diagnostic for edge ion temperature measurements at the ASDEX Upgrade tokamak (2004)

Reich, M., Wolfrum, E., Schweinzer, J., Ehmler, H., Horton, L. D., Neuhauser, J., ...

Bolometer tomography at the density limit of the HDH mode in the W7-AS stellarator (2003)

Giannone,L., Brakel,R., Burhenn,R., Ehmler,H., Feng,Y., Grigull,P., ...

The installation of divertor plates in the W7-AS stellarator has allowed attainment of a high energy confinement regime at high density, where the radiation profiles reached steady state. In this...

Island divertor experiments on the Wendelstein 7-AS stellarator (2003)

McCormick,K., Grigull,P., Burhenn,R., Brakel,R., Ehmler,H., Feng,Y., ...

A promising new operational regime on the Wendelstein stellarator W7-AS has been discovered, fulfilling the conditions of optimal core behavior in combination with edge parameters suitable for...

Divertor operation in stellarators: results from W7-AS and implications for future devices (2003)

Grigull,P., McCormick,K., Renner,H., Masuzaki,S., König,R., Baldzuhn,J., ...

The research on divertors for stellarators is at the beginning. Extensive studies are being prepared on large helical device (LHD) and W7-X. W7-AS is now being operated with an open island divertor...

Influence of magnetic field configurations on divertor plasma parameters in the W7-AS stellarator (2003)

Grigull,P., McCormick,K., Feng,Y., Werner,A., Brakel,R., Ehmler,H., ...

The new island divertor in W7-AS enables quasi steady-state operation with NBI at very high density including scenarios with stable detachment from the targets. Experiments with reversed B-field...

Investigation of the beta-limit in the W7-AS stellarator (2003)

Weller,A., Geiger,J., Zarnstorff,M., Sallander,E., Klose,S., Werner,A., ...

Investigations of the performance and stability of high-beta plasmas have been restarted in W7-AS utilizing higher heating powers and the new divertor system. The combination of beneficial effects...

Major results from Wendelstein 7-AS stellarator (2003)

Wagner,F., Burhenn,R., Gadelmeier,F., Geiger,J., Hirsch,M., Laqua,H. P., ...

W7-AS operates with an island divertor, which utilises the natural edge islands of the low-shear stellarator configuration to divert the plasma. High densities (up to 4×1020m-3) and partly detached...

Impurity transport model for the normal confinement and high density H-mode discharges in Wendelstein 7-AS (2003)

Ida,K., Burhenn,R., McCormick,K., Pasch,E., Yamada,H., Yoshinuma,M., ...

An impurity transport model based on diffusivity and the radial convective velocity is proposed as a first approach to explain the differences in the time evolution of Al XII (0.776 nm), Al XI (55...

Effects of the New Island Divertor on the Plasma Performance in the W7-AS Stellarator (2003)

Grigull,P., McCormick,K., Baldzuhn,J., Burhenn,R., Brakel,R., Ehmler,H., ...

The island divertor in the W7-AS stellarator enables access to a new NBI-heated, high density operating regime with promising confinement properties. This regime — the High Density H-Mode —...

Impact of Island Geometry on Island Divertor Performance (2003)

Feng,Y., Sardei,F., Grigull,P., McCormick,K., Kisslinger,J., Reiter,D., ...

The Wendelstein W7-AS High Density H-Mode, A Mode for the Future? (2003)

McCormick,K., Burhenn,R., Grigull,P., Baldzuhn,J., Bäumel,S., Brakel,R., ...

Improved Performance of the W7-AS Stellarator with the New Island Divertor (2003)

Brakel,R., Grigull,P., McCormick,K., Burhenn,R., Feng,Y., Sardei,F., ...

The island divertor concept has successfully been realized at W7-AS. The divertor gives access to a new NBI-heated high density regime with densities up to 4×10²⁰m-3 and energy confinement well...

Island divertor experiments on the Wendelstein 7-AS stellarator (2003)

McCormick,K., Grigull,P., Burhenn,R., Brakel,R., Ehmler,H., Feng,Y., ...

Major results from Wendelstein 7-AS stellarator (2003)

Wagner,F., Burhenn,R., Gadelmeier,F., Geiger,J., Hirsch,M., Laqua,H. P., ...

Bolometer tomography at the density limit of the HDH mode in the W7-AS stellarator (2003)

Giannone, L., Brakel, R., Burhenn, R., Ehmler, H., Feng, Y., Grigull, P., ...

The installation of divertor plates in the W7-AS stellarator has allowed attainment of a high energy confinement regime at high density, where the radiation profiles reached steady state. In this...

Island divertor experiments on the Wendelstein 7-AS stellarator (2003)

McCormick, K., Grigull, P., Burhenn, R., Brakel, R., Ehmler, H., Feng, Y., ...

A promising new operational regime on the Wendelstein stellarator W7-AS has been discovered, fulfilling the conditions of optimal core behavior in combination with edge parameters suitable for...

Divertor operation in stellarators: results from W7-AS and implications for future devices (2003)

Grigull, P., McCormick, K., Renner, H., Masuzaki, S., König, R., Baldzuhn, J., ...

The research on divertors for stellarators is at the beginning. Extensive studies are being prepared on large helical device (LHD) and W7-X. W7-AS is now being operated with an open island divertor...

Influence of magnetic field configurations on divertor plasma parameters in the W7-AS stellarator (2003)

Grigull, P., McCormick, K., Feng, Y., Werner, A., Brakel, R., Ehmler, H., ...

The new island divertor in W7-AS enables quasi steady-state operation with NBI at very high density including scenarios with stable detachment from the targets. Experiments with reversed B-field...

Investigation of the beta-limit in the W7-AS stellarator (2003)

Weller, A., Geiger, J., Zarnstorff, M., Sallander, E., Klose, S., Werner, A., ...

Investigations of the performance and stability of high-beta plasmas have been restarted in W7-AS utilizing higher heating powers and the new divertor system. The combination of beneficial effects...

Major results from Wendelstein 7-AS stellarator (2003)

Wagner, F., Burhenn, R., Gadelmeier, F., Geiger, J., Hirsch, M., Laqua, H. P., ...

W7-AS operates with an island divertor, which utilises the natural edge islands of the low-shear stellarator configuration to divert the plasma. High densities (up to 4×1020m-3) and partly detached...

Impurity transport model for the normal confinement and high density H-mode discharges in Wendelstein 7-AS (2003)

Ida, K., Burhenn, R., McCormick, K., Pasch, E., Yamada, H., Yoshinuma, M., ...

An impurity transport model based on diffusivity and the radial convective velocity is proposed as a first approach to explain the differences in the time evolution of Al XII (0.776 nm), Al XI (55...

Effects of the New Island Divertor on the Plasma Performance in the W7-AS Stellarator (2003)

Grigull, P., McCormick, K., Baldzuhn, J., Burhenn, R., Brakel, R., Ehmler, H., ...

The island divertor in the W7-AS stellarator enables access to a new NBI-heated, high density operating regime with promising confinement properties. This regime — the High Density H-Mode —...

Impact of Island Geometry on Island Divertor Performance (2003)

Feng, Y., Sardei, F., Grigull, P., McCormick, K., Kisslinger, J., Reiter, D., ...

The Wendelstein W7-AS High Density H-Mode, A Mode for the Future? (2003)

McCormick, K., Burhenn, R., Grigull, P., Baldzuhn, J., Bäumel, S., Brakel, R., ...

Improved Performance of the W7-AS Stellarator with the New Island Divertor (2003)

Brakel, R., Grigull, P., McCormick, K., Burhenn, R., Feng, Y., Sardei, F., ...

The island divertor concept has successfully been realized at W7-AS. The divertor gives access to a new NBI-heated high density regime with densities up to 4×10²⁰m-3 and energy confinement well...

Island divertor experiments on the Wendelstein 7-AS stellarator (2003)

McCormick, K., Grigull, P., Burhenn, R., Brakel, R., Ehmler, H., Feng, Y., ...

Charge-Exchange Spectroscopy at the W7-AS Stellarator Employing a High-Energy Li Beam (2003)

Ehmler, H., Baldzuhn, J., McCormick, K., Kreter, A., Klinger, T.

Experimental Check of Neoclassical Preditions for the Radial Electric Field in a Stellarator (2003)

Ehmler, H., Turkin, Y., Beidler, C.D., Maaßberg, H., Dinklage, A., Baldzuhn, J., ...

A new quasi-stationary, very high density plasma regime on the W7-AS stellarator (2002)

Jaenicke,R., Bäumel,S., Baldzuhn,J., Brakel,R., Burhenn,R., Ehmler,H., ...

Stellarators have the intrinsic property of steady state operation. However, on present-day stellarators the pulse length is usually not only limited due to technical reasons, but also by physical...

New advanced operational regime on the W7-AS stellarator (2002)

McCormick,K., Grigull,P., Burhenn,R., Brakel,R., Ehmler,H., Feng,Y., ...

A promising new plasma operational regime on the Wendelstein stellarator W7-AS has been discovered. It is extant above a threshold density and characterized by flat density profiles, high energy and...

Carbon concentration in the Wendelstein 7-AS stellarator measured with the high-energy Li beam (2002)

Ehmler,H., McCormick,K., Wolfrum,E., Burhenn,R., Grigull,P., Klinger,T., ...

Limits of ion-beam depth-profiling as used in diffusion studies on oxidation-sensitive materials (2002)

Ehmler,H., Rehmet,A., Rätzke,K., Faupel,F.

Comparative study of intrinsic edge impurities in the W7-AS stellarator during high confinement discharges (2002)

Ehmler,H., Burhenn,R., Baldzuhn,J., Dinklage,A., Giannone,L., Hartmann,D., ...

Comparative study of intrinsic edge impurities in the W7-AS stellarator during high confinement discharges (2002)

Ehmler,H., Burhenn,R., Baldzuhn,J., Dinklage,A., Giannone,L., Hartmann,D., ...

Island divertor experiments on the W7-AS stellarator (2002)

Gadelmeier,F., Grigull,P., McCormick,K., Brakel,R., Burhenn,R., Ehmler,H., ...

Bolometer tomography and density limit of the high density H-mode in the W7-AS Stellarator (2002)

Giannone,L., McCormick,K., Baldzuhn,J., Brakel,R., Burhenn,R., Ehmler,H., ...

Overview on recent W7-AS results (2002)

Jaenicke,R., Bäumel,S., Baldzuhn,J., Brakel,R., Burhenn,R., Ehmler,H., ...

Plasma performance of Wendelstein 7-AS with the new boundary-island divertor modules (2002)

McCormick,K., Grigull,P., Burhenn,R., Brakel,R., Ehmler,H., Feng,Y., ...

Performance and stability of high-β discharges in W7-AS (2002)

Weller,A., Geiger,J., Werner,A., Klose,S., Baldzuhn,J., Brakel,R., ...

Optimised Confinement discharges with high ion temperatures after installation of the island divertor in W7-AS (2002)

Kreter,A., Baldzuhn,J., Ehmler,H., Hirsch,M., Kick,M., Kislyakov,A., ...

Carbon concentration in the Wendelstein 7-AS stellarator measured with the high-energy Li beam (2002)

Ehmler, H., McCormick, K., Wolfrum, E., Burhenn, R., Grigull, P., Klinger, T., ...

Limits of ion-beam depth-profiling as used in diffusion studies on oxidation-sensitive materials (2002)

Ehmler, H., Rehmet, A., Rätzke, K., Faupel, F.

A new quasi-stationary, very high density plasma regime on the W7-AS stellarator (2002)

Jaenicke, R., Bäumel, S., Baldzuhn, J., Brakel, R., Burhenn, R., Ehmler, H., ...

Stellarators have the intrinsic property of steady state operation. However, on present-day stellarators the pulse length is usually not only limited due to technical reasons, but also by physical...

New advanced operational regime on the W7-AS stellarator (2002)

McCormick, K., Grigull, P., Burhenn, R., Brakel, R., Ehmler, H., Feng, Y., ...

A promising new plasma operational regime on the Wendelstein stellarator W7-AS has been discovered. It is extant above a threshold density and characterized by flat density profiles, high energy and...

Comparative study of intrinsic edge impurities in the W7-AS stellarator during high confinement discharges (2002)

Ehmler, H., Burhenn, R., Baldzuhn, J., Dinklage, A., Giannone, L., Hartmann, D., ...

Comparative study of intrinsic edge impurities in the W7-AS stellarator during high confinement discharges (2002)

Ehmler, H., Burhenn, R., Baldzuhn, J., Dinklage, A., Giannone, L., Hartmann, D., ...

Island divertor experiments on the W7-AS stellarator (2002)

Gadelmeier, F., Grigull, P., McCormick, K., Brakel, R., Burhenn, R., Ehmler, H., ...

Bolometer tomography and density limit of the high density H-mode in the W7-AS Stellarator (2002)

Giannone, L., McCormick, K., Baldzuhn, J., Brakel, R., Burhenn, R., Ehmler, H., ...

Overview on recent W7-AS results (2002)

Jaenicke, R., Bäumel, S., Baldzuhn, J., Brakel, R., Burhenn, R., Ehmler, H., ...

Plasma performance of Wendelstein 7-AS with the new boundary-island divertor modules (2002)

McCormick, K., Grigull, P., Burhenn, R., Brakel, R., Ehmler, H., Feng, Y., ...