Results 11 to 20 of about 3,977 (219)

Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100,000 [PDF]

Nature Communications, 2016
Early stellarator designs suffered from high particle losses, an issue that can be addressed by optimization of the coils. Here the authors measure the magnetic field lines in the Wendelstein 7-X stellarator, confirming that the complicated design of the
T. Sunn Pedersen, M. Otte, S. Lazerson, P. Helander, S. Bozhenkov, C. Biedermann, T. Klinger, R. C. Wolf, H. -S. Bosch, The Wendelstein 7-X Team   +9 more
doaj   +3 more sources

Predictive Correction Model for Corneal Back Surface Astigmatism With IOLMaster700 Keratometry Data in a Cataractous Population. [PDF]

Clin Exp Ophthalmol
ABSTRACT Background To develop and validate various models to predict total keratometry (TK) power vector components TKC0 and TKC45 from classical keratometry (K) KC0 and KC45 based on a large dataset of pre cataract surgery IOLMaster 700 measurements.
Langenbucher A, Hoffmann P, Cayless A, Szentmáry N, Riaz K, Gatinel D, Findl O, Pantanelli S, Yeo TK, Savini G, Wendelstein J.   +10 more
europepmc   +2 more sources

Deciphering the performance of different surface models for corneal topography. [PDF]

Ophthalmic Physiol Opt
Abstract Purpose To study the performance of different corneal surface models to be used for ray tracing. Models based on geometric surfaces and polynomial fits were compared and the differences discussed. Methods For this simulation study, five characteristic generic surface configurations were generated: (A) perfect biconic, (B) decentred biconic ...
Langenbucher A, Szentmáry N, Cayless A, Hoffmann P, Wendelstein J.   +4 more
europepmc   +2 more sources

Structural Cerebral Correlates of Perplexity: Exploring a Linguistic Marker in Cognitive Aging. [PDF]

Psych J
ABSTRACT Language changes are among the earliest indicators of cognitive decline in aging. Perplexity, a linguistic measure derived from information theory that quantifies speech predictability, has emerged as a potential marker for detecting early cognitive changes. However, its underlying neural substrates remain unclear.
Wang X, Herold CJ, Frankenberg C, Ablimit A, Schultz T, Kong L, Schröder J.   +6 more
europepmc   +2 more sources

Overdense plasma heating in Wendelstein 7-X(W7-X) stellarator

Results in Physics, 2017
High yield nuclear fusion operating in tokamak and stellarator need to heat plasma up to the required temperatures. As the confined plasma is overdensed, the electron cyclotron resonance heating (ECRH) is inefficient due to cut-off layer.
S. Adlparvar, S. Miraboutalebi, S.M. Sadat Kiai, L. Rajaee   +3 more
doaj   +2 more sources

Demonstration of reduced neoclassical energy transport in Wendelstein 7-X. [PDF]

Nature, 2021
0000-0002-4395-239XResearch on magnetic confinement of high-temperature plasmas has the ultimate goal of harnessing nuclear fusion for the production of electricity.
Beidler CD, Smith HM, Alonso A, Andreeva T, Baldzuhn J, Beurskens MNA, Borchardt M, Bozhenkov SA, Brunner KJ, Damm H, Drevlak M, Ford OP, Fuchert G, Geiger J, Helander P, Hergenhahn U, Hirsch M, Höfel U, Kazakov YO, Kleiber R, Krychowiak M, Kwak S, Langenberg A, Laqua HP, Neuner U, Pablant NA, Pasch E, Pavone A, Pedersen TS, Rahbarnia K, Schilling J, Scott ER, Stange T, Svensson J, Thomsen H, Turkin Y, Warmer F, Wolf RC, Zhang D, W7-X Team.   +39 more
europepmc   +2 more sources

Cryotechnology for Wendelstein 7-X

Fusion Engineering and Design, 2003
Abstract For the underlying task to cool the Wendelstein 7-X (W7-X) superconducting coil conductors and the divertor cryo-pumps, an extended cryo-system is required. Besides the magnet coils and cryo-pumps proper, the coil housings and supports, the thermal shields of the cryostat and cryo-pumps, and the current leads (CL) have to be cooled.
Schauer, F., Bau, H., Bozhko, Y., Brockmann, R., Nagel, M., Pietsch, M., Raatz, S.   +6 more
openaire   +3 more sources

Visible core spectroscopy at Wendelstein 7-X

Review of Scientific Instruments
This paper presents an overview of recent hardware extensions and data analysis developments to the Wendelstein 7-X visible core spectroscopy systems. These include upgrades to prepare the in-vessel components for long-pulse operation, nine additional spectrometers, a new line of sight array for passive spectroscopy, and a coherence imaging charge ...
W7-X Team, Ford, O. P., Langenberg, A., Romba, T., Pölöskei, P., Zanini, M., Bannmann, S., Gonda, T., Ida, K., Lopez Cansino, R., Pablant, N., De La Riva Villen, J., Swee, C., Yoshinuma, M., Alonso, A., Geiger, B., Perseo, V., Viezzer, E.   +17 more
openaire   +7 more sources

The ECRH-Power Upgrade at the Wendelstein 7-X Stellarator [PDF]

EPJ Web of Conferences, 2023
The existing ECRH system at W7-X consists of 10 gyrotrons, with output power levels ranging from 0.6 MW up to 1.0 MW each at a frequency of 140 GHz, quasi-optical transmission lines and microwave launchers at the plasma vessel.
Laqua H. P., Avramidis K. A., Braune H., Chelis I., Gantenbein G., Illy S., Ioannidis Z., Jelonnek J., Jin J., Krier L., Lechte C., Leggieri A., Legrand F., Marsen S., Moseev D., Oosterbeek H., Rzesnicki T., Ruess T., Stange T., Thumm M., Tigelis I., Wolf R. C.   +21 more
doaj   +1 more source

Status of WENDELSTEIN 7-X construction [PDF]

Proceedings of the 19th IEEE/IPSS Symposium on Fusion Engineering. 19th SOFE (Cat. No.02CH37231), 2003
WENDELSTEIN 7-X, being under construction at the Greifswald branch of the Max-Planck-Institut fur Plasmaphysik, has the objective to prove the reactor relevance of a HELIAS type stellarator. Energy and particle confinement will be investigated in an optimised magnetic configuration and stationary operation of a reactor relevant divertor system will be ...
Wanner, M., Erckmann, V., Feist, J. H., Gardebrecht, W., Hartmann, D., Krampitz, R., Niedermeyer, H., Renner, H., Rummel, T., Schauer, F., Wegener, L., Wesner, F., Müller, G. A., Kasparek, W., Thumm, Manfred . a. ., Dammertz, G.   +15 more
openaire   +9 more sources