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Tracer-Encapsulated Solid Pellet (TESPEL) injection system for Wendelstein 7-X
Impurity confinement in fusion plasmas is mainly determined by transport mechanisms in the core region. For the Wendelstein 7-X stellarator, its island divertor is expected to screen effectively external impurity sources in the scrape-off layer at higher densities. However, the unique feature of Tra...
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| Published in: | Review of scientific instruments 2018-10, Vol.89 (10), p.10K112-10K112 |
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| Main Authors: | , , , , , , |
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| Language: | English |
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| cited_by | cdi_FETCH-LOGICAL-c421t-b6453a1bb10db99a0bf7731ede52cb79c71c56605001d4e0302b72903b82ae603 |
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| cites | cdi_FETCH-LOGICAL-c421t-b6453a1bb10db99a0bf7731ede52cb79c71c56605001d4e0302b72903b82ae603 |
| container_end_page | 10K112 |
| container_issue | 10 |
| container_start_page | 10K112 |
| container_title | Review of scientific instruments |
| container_volume | 89 |
| creator | Bussiahn, R. Tamura, N. McCarthy, K. J. Burhenn, R. Hayashi, H. Laube, R. Klinger, T. |
| description | Impurity confinement in fusion plasmas is mainly determined by transport mechanisms in
the core region. For the Wendelstein 7-X stellarator, its island divertor is expected to
screen effectively external impurity sources in the scrape-off layer at higher densities.
However, the unique feature of Tracer-Encapsulated Solid Pellet (TESPEL) injection,
releasing impurities at a well-localized radial position directly in the core plasma,
enables investigating such transport mechanisms. This paper reports on the detailed design
of a completely new TESPEL injection system, which has been designed by the National
Institute for Fusion Science, Toki, Japan, and is currently being installed at
Max-Planck-Institut für Plasmaphysik, Greifswald, Germany, for the Wendelstein 7-X. This
injector consists of a storage and injection unit, attached to a system of guiding tubes
which run through 3 successive differential pumping stages. A light-gate system and an
optical observation system are used to determine the location of the deposited tracers.
Laboratory tests carried out by shooting TESPELs onto a sample foil showed good
performance after careful realignment of the guiding tubes. |
| doi_str_mv | 10.1063/1.5038844 |
| format | article |
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the core region. For the Wendelstein 7-X stellarator, its island divertor is expected to
screen effectively external impurity sources in the scrape-off layer at higher densities.
However, the unique feature of Tracer-Encapsulated Solid Pellet (TESPEL) injection,
releasing impurities at a well-localized radial position directly in the core plasma,
enables investigating such transport mechanisms. This paper reports on the detailed design
of a completely new TESPEL injection system, which has been designed by the National
Institute for Fusion Science, Toki, Japan, and is currently being installed at
Max-Planck-Institut für Plasmaphysik, Greifswald, Germany, for the Wendelstein 7-X. This
injector consists of a storage and injection unit, attached to a system of guiding tubes
which run through 3 successive differential pumping stages. A light-gate system and an
optical observation system are used to determine the location of the deposited tracers.
Laboratory tests carried out by shooting TESPELs onto a sample foil showed good
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the core region. For the Wendelstein 7-X stellarator, its island divertor is expected to
screen effectively external impurity sources in the scrape-off layer at higher densities.
However, the unique feature of Tracer-Encapsulated Solid Pellet (TESPEL) injection,
releasing impurities at a well-localized radial position directly in the core plasma,
enables investigating such transport mechanisms. This paper reports on the detailed design
of a completely new TESPEL injection system, which has been designed by the National
Institute for Fusion Science, Toki, Japan, and is currently being installed at
Max-Planck-Institut für Plasmaphysik, Greifswald, Germany, for the Wendelstein 7-X. This
injector consists of a storage and injection unit, attached to a system of guiding tubes
which run through 3 successive differential pumping stages. A light-gate system and an
optical observation system are used to determine the location of the deposited tracers.
Laboratory tests carried out by shooting TESPELs onto a sample foil showed good
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the core region. For the Wendelstein 7-X stellarator, its island divertor is expected to
screen effectively external impurity sources in the scrape-off layer at higher densities.
However, the unique feature of Tracer-Encapsulated Solid Pellet (TESPEL) injection,
releasing impurities at a well-localized radial position directly in the core plasma,
enables investigating such transport mechanisms. This paper reports on the detailed design
of a completely new TESPEL injection system, which has been designed by the National
Institute for Fusion Science, Toki, Japan, and is currently being installed at
Max-Planck-Institut für Plasmaphysik, Greifswald, Germany, for the Wendelstein 7-X. This
injector consists of a storage and injection unit, attached to a system of guiding tubes
which run through 3 successive differential pumping stages. A light-gate system and an
optical observation system are used to determine the location of the deposited tracers.
Laboratory tests carried out by shooting TESPELs onto a sample foil showed good
performance after careful realignment of the guiding tubes.</abstract><cop>United States</cop><pmid>30399711</pmid><doi>10.1063/1.5038844</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0002-6408-0922</orcidid><orcidid>https://orcid.org/0000000264080922</orcidid><oa>free_for_read</oa></addata></record> |
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| source | American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); AIP_美国物理联合会现刊（与NSTL共建） |
| title | Tracer-Encapsulated Solid Pellet (TESPEL) injection system for Wendelstein 7-X |
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