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ITER ECRH upper launcher torus diamond window : Prototyping, testing and qualification
- Source :
- Fusion engineering and design, 96-97, 593-596
- Publication Year :
- 2015
- Publisher :
- Elsevier, 2015.
-
Abstract
- The diamond window assembly is part of the ITER primary vacuum boundary and acts as the first tritium barrier and therefore it is classified as Safety/Protection Important Component (SIC/PIC). It consists of an ultra-low loss CVD diamond disk mounted in a system of metallic parts (copper/steel) and has to fulfil adequate transmission capability for high power mm-waves. High power RF experiments with a 1st window prototype had shown parasitic heating due to small gaps in the housing. After a design optimization directed to the mm-wave properties, the parasitic excitations of oscillations have been avoided in a 2nd prototype. This one is equipped with inserted waveguide structures, which cover gaps in the metallic structure of the window housing. From high power RF-measurements with a 0.86 MW/100 s pulse a loss tangent of 7.1 × 10−6 could be estimated, corresponding to an increase of temperature of only 120 mK between inlet and outlet of the cooling system. The diamond window assemblies cannot be entirely covered by codes and standards. To comply with the French safety regulations, instead an ad-hoc qualification programme is required, being developed in the framework of a contract between KIT and F4E. A new prototype (3rd) will be built, which is designed to fit to the single HELICOFLEX sealed waveguide structures of the ex-vessel mm-system of the EC upper launcher (UL). The testing programme ranges from mechanical to vacuum tests up to dielectric loss measurements at low and high power. A clear definition of the testing requirements and of the acceptance criteria is necessary as well as a complete documentation of the process.
- Subjects :
- Materials science
Mechanical Engineering
Mechanical engineering
Window (computing)
Diamond
engineering.material
law.invention
Power (physics)
Nuclear Energy and Engineering
Acceptance testing
law
engineering
Water cooling
Dissipation factor
General Materials Science
Dielectric loss
ddc:620
Waveguide
Engineering & allied operations
Civil and Structural Engineering
Subjects
Details
- Language :
- English
- ISSN :
- 09203796 and 18737196
- Database :
- OpenAIRE
- Journal :
- Fusion engineering and design, 96-97, 593-596
- Accession number :
- edsair.doi.dedup.....d4bb261c3dc4f20b52e741b376fc6d2b