Results 61 to 70 of about 6,348 (198)

Dwarf novae in the Hamburg quasar survey : rarer than expected [PDF]

, 2006
Aims. We report the discovery of five new dwarf novae that were spectroscopically identified in the Hamburg Quasar Survey (HQS),and discuss the properties of the sample of new dwarf novae from the HQS. Methods.
A. Aungwerojwit, A. Staude, Abbott, Andronov, Araujo-Betancor, Araujo-Betancor, Aungwerojwit, B. T. Gänsicke, Barker, Bergeron, Berriman, Bertin, Beuermann, Billington, Cannizzo, D. Engels, D. Mislis, D. Nogami, de Kool, E. T. Harlaftis, Fiedler, Gilliland, Gänsicke, Gänsicke, Gänsicke, Gänsicke, Gänsicke, H.-J. Hagen, Hagen, Hamilton, Hessman, Hessman, Horne, Howell, Howell, Jiang, Kato, Kato, King, King, Knigge, Kolb, Kolb, M. A. P. Torres, Martin, Mennickent, Monet, Nogami, O. Baernbantner, Osaki, P. Rodríguez-Gil, P. Schmeer, Paczynski, Patterson, Patterson, Patterson, Patterson, Patterson, Patterson, Patterson, Politano, R. E. Fried, R. Schwarz, Rappaport, Reimers, Renvoizé, Ringwald, Ritter, Rodríguez-Gil, Rodríguez-Gil, Rodríguez-Gil, Rodríguez-Gil, Rogoziecki, Roth, S. Araujo-Betancor, Scargle, Schneider, Schwarz, Schwarzenberg-Czerny, Schwarzenberg-Czerny, Shafter, Shafter, Shafter, Spruit, Stauffer, Szkody, Szkody, Tappert, Thorstensen, Thorstensen, Thorstensen, Tovmassian, Townsley, van Teeseling, Voges, Wade, Wu, Zhang   +97 more
core   +2 more sources

Global gyrokinetic analysis of Wendelstein 7-X discharge: unveiling the importance of trapped-electron-mode and electron-temperature-gradient turbulence

Nuclear Fusion
We present the first nonlinear, gyrokinetic, radially global simulation of a discharge of the Wendelstein 7-X-like stellarator, including kinetic electrons, an equilibrium radial electric field, as well as electromagnetic and collisional effects.
Felix Wilms, Alejandro Bañón Navarro, Thomas Windisch, Sergey Bozhenkov, Felix Warmer, Golo Fuchert, Oliver Ford, Daihong Zhang, Torsten Stange, Frank Jenko, the W7-X Team   +10 more
doaj   +1 more source

Study on resonant electron cyclotron heating by OSXB double mode conversion at the W7-X stellarator

Nuclear Engineering and Technology, 2018
Electromagnetic waves potentially have been used to heat overdense nuclear fusion plasmas through a double mode conversion from ordinary to slow extraordinary and finally to Electron Bernstein Wave (EBW) modes, OSXB.
S. Adlparvar, S. Miraboutalebi, S.M. Sadat Kiai, L. Rajaee   +3 more
doaj   +1 more source

Observation of non-thermal electrons outside the SOL in the Wendelstein 7-X stellarator

Nuclear Materials and Energy, 2022
Hot spots and bright patterns on plasma-facing components (PFC) in visible light are observed in electron cyclotron resonance heated (ECRH) plasmas at low densities in the stellarator Wendelstein 7-X.
C. Killer, P. Aleynikov, C. Biedermann, C.P. Dhard, P. Drews, Y. Gao, O. Grulke, M. Jakubowski, A. Knieps, G. Kocsis, D. Naujoks, A. Puig Sitjes, M. Spolaore, T. Stange, T. Szepesi, A. Tancetti, H. Thomsen   +16 more
doaj   +1 more source

Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501

, 1996
We report on a global CCD time-series photometric campaign to decode the pulsations of the nucleus of the planetary nebula NGC1501. The star is hot and hydrogen-deficient, similar to the pre-white-dwarf PG 1159 stars. NGC1501 shows pulsational brightness
Bond, H. E., Chen, J. -S., Ciardullo, R., Hashimoto, O., Ishida, T., Kambe, E., Kato, M., Kato, T., Kawaler, S., Kuroda, T., Leibowitz, E. M., Malasan, H., Mitsch, W., Ono, T., Roth, M. M., Soffner, T., Stover, R., Takeuti, M., Tamura, S., Yamasaki, A.   +19 more
core   +2 more sources

Impurities in a non-axisymmetric plasma: transport and effect on bootstrap current [PDF]

, 2015
Impurities cause radiation losses and plasma dilution, and in stellarator plasmas the neoclassical ambipolar radial electric field is often unfavorable for avoiding strong impurity peaking.
Braun, Stefanie, Helander, Per, Landreman, Matt, Mollén, Albert, Smith, Håkan M.   +4 more
core   +2 more sources

Validation of a synthetic fast ion loss detector model for Wendelstein 7-X

Nuclear Fusion
We present the first validated synthetic diagnostic for fast ion loss detectors (FILDs) in the Wendelstein 7-X (W7-X) stellarator. This model has been developed on, and validated against experimental data from, a FILD provided by the National Institute ...
A. LeViness, S.A. Lazerson, A. Jansen van Vuuren, J. Rueda-Rueda, M. Beurskens, S. Bozhenkov, K.J. Brunner, O.P. Ford, G. Fuchert, M. Garcìa-Muñoz, M. Isobe, C. Killer, J. Knauer, K. Ogawa, N. Pablant, E. Pasch, P. Poloskei, T. Romba, the W7-X Team   +18 more
doaj   +1 more source

Impact of impurities on the effective charge state distribution in the limiter plasmas of Wendelstein 7-X

Nuclear Materials and Energy, 2019
Carbon and oxygen have been identified as the two major impurities in the first limiter operational phase of the stellarator Wendelstein 7-X. We evaluate basic differences between these impurities regarding the effective charge state in the boundary ...
J. Cosfeld, M. Rack, D. Reiter, P. Drews, Y. Feng, D. Zhang   +5 more
doaj   +1 more source

Broadband Alfvénic excitation correlated to turbulence level in the Wendelstein 7-X stellarator plasmas

Nuclear Fusion, 2023
During the first operational phase (OP1) of the Wendelstein 7-X (W7-X) stellarator, poloidal magnetic field fluctuations, $\dot{B}_{\theta}$ , were measured in several different plasma scenarios with a system of Mirnov coils.
S. Vaz Mendes, K. Rahbarnia, C. Slaby, H. Thomsen, J. Schilling, M. Borchardt, R. Kleiber, A. Könies, J.-P. Bähner, A. von Stechow, T. Sunn Pedersen, T. Klinger, the W7-X Team   +12 more
doaj   +1 more source

Construction and assembly of WENDELSTEIN 7-X [PDF]

Fusion Engineering and Design, 2006
Abstract WENDELSTEIN 7-X (W7-X) is an optimised stellarator which shall demonstrate the reactor relevance of the HELIAS type magnetic configuration. The magnet configuration is produced by a set of 50 non-planar and 20 planar superconducting coils.
openaire   +2 more sources