<div class="csl-bib-body">
<div class="csl-entry">Arredondo Parra, R., Moreno Quicios, R., Ploeckl, B., Birkenmeier, G., Herrmann, A., Kocsis, G., Laggner, F., Lang, P. T., Lunt, T., Macian-Juan, R., Rohde, V., Sellmair, G., Szepesi, T., Wolfrum, E., Zeidner, W., & Neu, R. (2016). A compact lithium pellet injector for tokamak pedestal studies in ASDEX Upgrade. <i>Review of Scientific Instruments</i>, <i>87</i>(2), 023508. https://doi.org/10.1063/1.4942122</div>
</div>
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dc.identifier.issn
0034-6748
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/149979
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dc.description.abstract
Experiments have been performed at ASDEX Upgrade, aiming to investigate the impact of lithium in
an all-metal-wall tokamak and attempting to enhance the pedestal operational space. For this purpose,
a lithium pellet injector has been developed, capable of injecting pellets carrying a particle content
ranging from 1.82 ⇥ 1019 atoms (0.21 mg) to 1.64 ⇥ 1020 atoms (1.89 mg). The maximum repetition
rate is about 2 Hz. Free flight launch from the torus outboard side without a guiding tube was
realized. In such a configuration, angular dispersion and speed scatter are low, and a transfer efficiency
exceeding 90% was achieved in the test bed. Pellets are accelerated in a gas gun; hence special care
was taken to avoid deleterious e↵ects by the propellant gas pulse. Therefore, the main plasma gas
species was applied as propellant gas, leading to speeds ranging from 420 m/s to 700 m/s. In order
to minimize the residual amount of gas to be introduced into the plasma vessel, a large expansion
volume equipped with a cryopump was added into the flight path. In view of the experiments, an
optimal propellant gas pressure of 50 bars was chosen for operation, since at this pressure maximum
efficiency and low propellant gas flux coincide. This led to pellet speeds of 585m/s ± 32m/s. Lithium
injection has been achieved at ASDEX Upgrade, showing deep pellet penetration into the plasma,
though pedestal broadening has not been observed yet.
en
dc.language.iso
en
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dc.publisher
AIP PUBLISHING
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dc.relation.ispartof
Review of Scientific Instruments
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dc.subject
Instrumentation
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dc.title
A compact lithium pellet injector for tokamak pedestal studies in ASDEX Upgrade
en
dc.type
Artikel
de
dc.type
Article
en
dc.description.startpage
023508
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dc.type.category
Original Research Article
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tuw.container.volume
87
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tuw.container.issue
2
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
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wb.publication.intCoWork
International Co-publication
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tuw.researchTopic.id
M2
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.value
100
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dcterms.isPartOf.title
Review of Scientific Instruments
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tuw.publication.orgunit
E134-03 - Forschungsbereich Atomic and Plasma Physics