Design, capabilities, and first results of the new laser blow-off system on Wendelstein 7-X

Wegner, Th.; Geiger, B.; Kunkel, F.; Burhenn, R.; Schröder, T.; Biedermann, C.; Buttenschön, B.; Cseh, G.; Drews, P.; Grulke, O.; Hollfeld, K.; Killer, C.; Kocsis, G.; Krings, T.; Langenberg, A.; Marchuk, O.; Neuner, U.; Nicolai, D.; Offermanns, G.; Pablant, N. A.; Rahbarnia, K.; Satheeswaran, G.; Schilling, J.; Schweer, B.; Szepesi, T.; Thomsen, H.

doi:10.1063/1.5037543

Title: Design, capabilities, and first results of the new laser blow-off system on Wendelstein 7-X

Journal Article · 20 July 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5037543 · OSTI ID:1473872

^[1]; Geiger, B. ^[1]; Kunkel, F. ^[1]; Burhenn, R. ^[1];

^[1]; Biedermann, C. ^[1];

^[1]; Cseh, G. ^[2];

^[3]; Grulke, O. ^[1]; Hollfeld, K. ^[3];

^[1]; Kocsis, G. ^[2]; Krings, T. ^[3]; Langenberg, A. ^[1];

^[3]; Neuner, U. ^[1];

^[3]; Offermanns, G. ^[3];

^[4] more »

Max-Planck Inst. for Plasma Physics, Greifswald (Germany)
Wigner Research Center for Physics, Budapest (Hungary)
Forschungszentrum Julich (Germany)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Here, we present a detailed overview and first results of the new laser blow-off system on the stellarator Wendelstein 7-X. The system allows impurity transport studies by the repetitive and controlled injection of different tracer ions into the plasma edge. A Nd:YAG laser is used to ablate a thin metal film, coated on a glass plate, with a repetition rate of up to 20 Hz. A remote-controlled adjustable optical system allows the variation of the laser spot diameter and enables the spot positioning to non-ablated areas on the target between laser pulses. During first experiments, clear spectral lines from higher ionization stages of the tracer ions have been observed in the X-ray to the extreme ultraviolet spectral range. The temporal behavior of the measured emission allows the estimate of transport properties, e.g., impurity transport times in the order of 100 ms. Although the strong injection of impurities is well detectable, the global plasma parameters are barely changed.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; European Commission (EC)

Contributing Organization:: W7-X Team

OSTI ID:: 1473872

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 7 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Prospects of X-ray imaging spectrometers for impurity transport: Recent results from the stellarator Wendelstein 7-X (invited) Langenberg, A.; Pablant, N. A.; Wegner, Th. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036536	journal	October 2018
Plasma impurities observed by a pulse height analysis diagnostic during the divertor campaign of the Wendelstein 7-X stellarator Kubkowska, M.; Czarnecka, A.; Fornal, T. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038850	journal	October 2018
Charge exchange recombination spectroscopy at Wendelstein 7-X Ford, O. P.; Vanó, L.; Alonso, J. A. Review of Scientific Instruments, Vol. 91, Issue 2 https://doi.org/10.1063/1.5132936	journal	February 2020
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Observation of anomalous impurity transport during low-density experiments in W7-X with laser blow-off injections of iron Geiger, B.; Wegner, Th.; Beidler, C. D. Nuclear Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1741-4326/aaff71	journal	February 2019
Overview of first Wendelstein 7-X high-performance operation Klinger, T.; Andreeva, T.; Bozhenkov, S. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab03a7	journal	June 2019
Plasma termination by excess pellet fueling and impurity injection in TJ-II, the Large Helical Device and Wendelstein 7-X Dinklage, A.; McCarthy, K. J.; Suzuki, C. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab17fd	journal	May 2019
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Overview of first Wendelstein 7-X high-performance operation Klinger, T.; Andreeva, T.; Bozhenkov, Sergey Technische Universität Berlin https://doi.org/10.14279/depositonce-15100	text	January 2019
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