Results 71 to 80 of about 6,348 (198)

Photometric monitoring of the young star Par 1724 in Orion

, 2009
We report new photometric observations of the 200000 year old naked weak-line run-away T Tauri star Par 1724, located north of the Trapezium cluster in Orion. We observed in the broad band filters B, V, R, and I using the 90cm Dutch telescope on La Silla,
Alekseev, Baliunas, Broeg, Broeg, Burke, Cutispoto, Cutispoto, Cutispoto, Cutispoto, Dworetsky, Galadi-Enriquez, Horne, Jones, Kazarovets, Lafler, Landolt, Lenz, Morel, Mugrauer, Neuhäuser, Parenago, Scargle, Schwabe, Tanner   +23 more
core   +2 more sources

Bayesian modelling of multiple plasma diagnostics at Wendelstein 7-X

Nuclear Fusion
Inference of electron density and temperature has been performed using multiple, diverse sets of plasma diagnostic data at Wendelstein 7-X. Predictive models for the interferometer, Thomson scattering and helium beam emission spectroscopy (He-BES ...
Sehyun Kwak, U. Hoefel, M. Krychowiak, A. Langenberg, J. Svensson, H. Trimino Mora, Y.-C. Ghim, the W7-X Team   +7 more
doaj   +1 more source

Investigation of a low frequency coherent mode in Wendelstein 7-X with island divertor

Nuclear Fusion, 2023
During the island divertor operation of W7-X, especially in standard magnetic configuration (with 5/5 island chain in the scrape-off-layer (SOL)), quasi-periodic electromagnetic oscillation is observed.
H.M. Xiang, A. Krämer-Flecken, X. Han, T. Windisch, G. Weir, K. Rahbarnia, J. Schilling, H. Thomsen, S.vaz Mendes, A. Knieps, M. Vécsei, M. Otte, S. Zoletnik, G. Anda, D. Dunai, D. Zhang, P. Kornejew, J. Huang, T. Zhang, X.D. Lin, X. Gao, Y. Liang, the W7-X team   +22 more
doaj   +1 more source

Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma

, 2017
The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fusion energy sources.
Helander, Per, Mollén, Albert, Newton, Sarah L., Smith, Håkan M.   +3 more
core   +1 more source

On O-X mode conversion in 2D inhomogeneous plasma with a sheared magnetic field

, 2009
The conversion of an ordinary wave to an extraordinary wave in a 2D inhomogeneous slab model of the plasma confined by a sheared magnetic field is studied analytically.Comment: sub.
A Yu Popov, Bateman H, Davies B, Gospodchikov E D, Gospodchikov E D, Gospodchikov E D Shalashov A G, Irzak M A, Maslov V P, Popov A Yu, Tokman M D   +9 more
core   +1 more source

Collective Thomson scattering diagnostic at Wendelstein 7-X [PDF]

Review of Scientific Instruments, 2019
A Collective Thomson Scattering (CTS) diagnostic is installed at Wendelstein 7-X for ion temperature measurements in the plasma core. The diagnostic utilizes 140 GHz gyrotrons usually used for electron cyclotron resonance heating (ECRH) as a source of probing radiation.
D. Moseev, M. Stejner, T. Stange, I. Abramovic, H. P. Laqua, S. Marsen, N. Schneider, H. Braune, U. Hoefel, W. Kasparek, S. B. Korsholm, C. Lechte, F. Leipold, S. K. Nielsen, M. Salewski, J. Rasmussen, M. Weißgerber, R. C. Wolf   +17 more
openaire   +4 more sources

In-vessel inspection of arc traces on the W7-X plasma facing components after the operation phase OP2.1

Nuclear Materials and Energy
Updated distribution of arc traces across the interior walls after the operation phase 2.1 of Wendelstein 7-X (W7-X) is reported. A total of 105 new arc places were found, with 95% of them located around the stainless steel panels, diagnostic ports, and ...
D. Hwangbo, C.P. Dhard, S. Kajita, D. Naujoks, Y. Gao   +4 more
doaj   +1 more source

Wall conditioning throughout the first carbon divertor campaign on Wendelstein 7-X

Nuclear Materials and Energy, 2018
Controlling the recycling of hydrogen and the release of impurities from the plasma facing components proved to be essential and challenging throughout the first divertor campaign on W7-X. This paper discusses the conditioning requirements throughout the
Tom Wauters, Andrei Goriaev, Arturo Alonso, Juergen Baldzuhn, Rudolf Brakel, Sebastijan Brezinsek, Andreas Dinklage, Heinz Grote, Joris Fellinger, Oliver P. Ford, Ralf König, Heinrich Laqua, Dmitry Matveev, Torsten Stange, Lilla Vanó   +14 more
doaj   +1 more source

Concurrent operation of 10 gyrotrons at W7-X experience and improvement opportunities

EPJ Web of Conferences, 2018
At the stellarator Wendelstein 7-X (W7-X) Electron Cyclotron Resonance Heating (ECRH) is the main heating system for steady-state operation and was the only available heating system during the operation phase OP1.2a in 2017.
Braune H., Brunner K.J., Laqua H.P., Marsen S., Moseev D., Noke F., Purps F., Schneider N., Schulz T., Stange T., Uhren P., Wilde F.   +11 more
doaj   +1 more source

Microlensing events from the 11-year observations of the Wendelstein Calar Alto Pixellensing Project

, 2015
We present the results of the decade-long M31 observation from the Wendelstein Calar Alto Pixellensing Project (WeCAPP). WeCAPP has monitored M31 from 1997 till 2008 in both R- and I-filters, thus provides the longest baseline of all M31 microlensing ...
Bender, R., Koppenhoefer, J., Lee, C. -H., Riffeser, A., Seitz, S.   +4 more
core   +1 more source