Journal Article FZJ-2019-04300

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Endoscopes for observation of plasma-wall interactions in the divertor of Wendelstein 7-X

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2019
Elsevier New York, NY [u.a.]

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Abstract: The stellarator Wendelstein 7-X is being prepared for long pulse operation. This includes diagnostics for investigation of plasma wall interaction processes. A versatile optical observation system has been developed for local characterization of the divertor plasma and the divertor target surface. The optical systems consist of two endoscopes each with perpendicular fields of view and the opportunity of tomographic reconstruction. Mirror based optics has been chosen in order to assure good optical properties independent of the wavelength. A narrow field of view allows for high spatial resolution while rotation of the first mirror covers the full poloidal divertor sections. An integrated shutter mechanism and a vacuum window far back minimize coating of optical components. For assessment of change of light transmission, a relative calibration function is implemented. The output light is split into wavelength ranges. Both, cameras equipped with narrow band filters as well as spectrometers are connected. The first endoscope was mounted at W7-X after successfully passing mechanical, optical and functional tests.

Classification:

Contributing Institute(s):
  1. Plasmaphysik (IEK-4)
  2. Nukleare Entsorgung und Reaktorsicherheit (IEK-6)
  3. Zentralinstitut für Technologie (ZEA-1)
Research Program(s):
  1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)

Appears in the scientific report 2019
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Embargoed OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; IF < 5 ; JCR ; NationallizenzNationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection
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Document types > Articles > Journal Article
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Institute Collections > IEK > IEK-6
Institute Collections > IEK > IEK-4
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 Record created 2019-08-20, last modified 2021-01-30


Published on 2018-11-16. Available in OpenAccess from 2020-11-16.:
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