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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [1];  [3]; ORCiD logo [1];  [2];  [3];  [1]; ORCiD logo [3];  [1]; ORCiD logo [3];  [3]; ORCiD logo [4] more »;  [1]; ORCiD logo [3]; ORCiD logo [1];  [3];  [2];  [1] « less
  1. Max-Planck Inst. for Plasma Physics, Greifswald (Germany)
  2. Wigner Research Center for Physics, Budapest (Hungary)
  3. Forschungszentrum Julich (Germany)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; European Commission (EC)
Contributing Org.:
W7-X Team
OSTI Identifier:
1473872
Grant/Contract Number:  
633053
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 7; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

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., and Thomsen, H. Design, capabilities, and first results of the new laser blow-off system on Wendelstein 7-X. United States: N. p., 2018. Web. doi:10.1063/1.5037543.
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. Design, capabilities, and first results of the new laser blow-off system on Wendelstein 7-X. United States. doi:10.1063/1.5037543.
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., and Thomsen, H. Fri . "Design, capabilities, and first results of the new laser blow-off system on Wendelstein 7-X". United States. doi:10.1063/1.5037543. https://www.osti.gov/servlets/purl/1473872.
@article{osti_1473872,
title = {Design, capabilities, and first results of the new laser blow-off system on Wendelstein 7-X},
author = {Wegner, Th. and Geiger, B. and Kunkel, F. and Burhenn, R. and Schröder, T. and Biedermann, C. and Buttenschön, B. and Cseh, G. and Drews, P. and Grulke, O. and Hollfeld, K. and Killer, C. and Kocsis, G. and Krings, T. and Langenberg, A. and Marchuk, O. and Neuner, U. and Nicolai, D. and Offermanns, G. and Pablant, N. A. and Rahbarnia, K. and Satheeswaran, G. and Schilling, J. and Schweer, B. and Szepesi, T. and Thomsen, H.},
abstractNote = {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.},
doi = {10.1063/1.5037543},
journal = {Review of Scientific Instruments},
number = 7,
volume = 89,
place = {United States},
year = {2018},
month = {7}
}

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Cited by: 9 works
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Figures / Tables:

Figure 1 Figure 1: Schematic side view of the experimental setup with the result of the ray tracing calculation (red beam). The laser blow-off system is installed below the multi-purpose manipulator which is used for the positioning of the glass target holder inside the torus. The glass target holder, enlarged in themore » lower right corner, mounts 4 different glass targets at the same time.« less

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