2026
article
OpenAlex
H.M. Xiang, Andreas Krämer-Flecken, Xiang Han, Jia Huang et autres
Abstract A frequency modulated continues wave (FMCW) reflectometry with heterodyne detection has been developed for electron density profile measurement in front of the ion cyclotron resonance heating (ICRH) antenna on Wendelstein 7-X (W7-X). The dual-band setup consists of one band at E-band …
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Accès ouvert
2025
article
OpenAlex
I. Stepanov, Johannes Peter Kallmeyer, Dirk A. Hartmann, Michel Vervier et autres
us, de, be
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Accès ouvert
2024
article
OpenAlex
O. Grulke, Christopher G. Albert, P. Aleynikov, K. Aleynikova et autres
Abstract After a long device enhancement phase, scientific operation resumed in 2022. The main new device components are the water cooling of all plasma facing components and the new water-cooled high heat flux divertor units. Water cooling allowed for the first long-pulse …
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2023
article
OpenAlex
J. Ongena, D. Castaño-Bardawil, K. Crombé, Y. Kazakov et autres
be, de
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2023
conference-paper
OpenAlex
K. Crombé, J. Buermans, D. Castaño-Bardawil, A. Goriaev et autres
The study of discharge initiation by an Ion Cyclotron Range of Frequency (ICRF) antenna is of importance for operational scenarios at low magnetic field in e.g., ITER and Wendelstein 7-X. At low magnetic fields ohmic breakdown is difficult because of relatively short …
2023
conference-paper
OpenAlex
J. Ongena, D. Castaño-Bardawil, K. Crombé, Ye. O. Kazakov et autres
Accès ouvert
2021
article
OpenAlex
T. S. Pedersen, Ivana Matešić Abramović, P. Agostinetti, M. Agredano Torres et autres
Abstract We present recent highlights from the most recent operation phases of Wendelstein 7-X, the most advanced stellarator in the world. Stable detachment with good particle exhaust, low impurity content, and energy confinement times exceeding 100 ms, have been maintained for tens …
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Accès ouvert
2021
article
OpenAlex
D. Castaño-Bardawil, Bernd Schweer, J. Ongena, W. Behr et autres
The newly developed ICRH antenna system for the stellarator W7-X will be available for Operational Phase 2.1. The design and application of various components in the ICRH system was validated using a prototype of the antenna box with straps. Electromagnetic characteristics were …
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Accès ouvert
2021
article
OpenAlex
Michael Hubeny, Daniel Höschen, Olaf Neubauer, R. Hoek et autres
The research on plasma facing components in view of plasma wall interactions is advancing towards a new level with the availability of long pulse plasma machines. With Wendelstein 7-X (W7-X) the first stellarator provides steady-state discharges with up to 30 min in …
de
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Accès ouvert
2020
conference-paper
OpenAlex
J. Ongena, André Messiaen, Ye. O. Kazakov, Bernd Schweer et autres
An important test for W7-X is to demonstrate confinement of fast trapped ions at volume averaged beta values up to 5%, corresponding to plasma densities above 1020 m−3. Energetic ions in W7-X with energies 50 < E < 100 keV mimic alphas …
be, de
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2019
article
OpenAlex
J. Ongena, Bernd Schweer, M. Vervier, V. Borsuk et autres
de
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Accès ouvert
2018
conference-paper
OpenAlex
J. Ongena, André Messiaen, Ye. O. Kazakov, Bernd Schweer et autres
An important aim of W7-X is to demonstrate fast ion confinement at volume averaged beta values up to 5%, corresponding to plasma densities above 10 20 m -3 .To this end, an ICRH system is prepared for W7-X, with RF power up …
de
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