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Title: A near infra-red video system as a protective diagnostic for electron cyclotron resonance heating operation in the Wendelstein 7-X stellarator

The Wendelstein 7-X stellarator is a large nuclear fusion device based at Max-Planck-Institut für Plasmaphysik in Greifswald in Germany. The main plasma heating system for steady state operation in W7-X is electron cyclotron resonance heating (ECRH). During operation, part of plama facing components will be directly heated by the non-absorbed power of 1 MW rf beams of ECRH. In order to avoid damages of such components made of graphite tiles during the first operational phase, a near infra-red video system has been developed as a protective diagnostic for safe and secure ECRH operation. Both the mechanical design housing the camera and the optical system are very flexible and respect the requirements of steady state operation. The full system including data acquisition and control system has been successfully tested in the vacuum vessel, including on-line visualization and data storage of the four cameras equipping the ECRH equatorial launchers of W7-X.
Authors:
; ; ;  [1] ; ; ;  [2]
  1. Max-Planck-Institut für Plasmaphysik (IPP), D-17491 Greifswald (Germany)
  2. IRFM, CEA-Cadarache, 13108 Saint Paul lez Durance Cedex (France)
Publication Date:
OSTI Identifier:
22482597
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 11; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAMS; CAMERAS; CONTROL SYSTEMS; DATA ACQUISITION; DESIGN; ECR HEATING; GRAPHITE; OPERATION; OPTICAL SYSTEMS; STEADY-STATE CONDITIONS; THERMONUCLEAR DEVICES