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DTSTAMP:20260317T125044Z
UID:https://www.ipp.mpg.de/events/44321/14160
DTSTART:20260121T133000Z
DTEND:20260121T143000Z
CLASS:PUBLIC
CREATED:20260109T091958Z
DESCRIPTION: The Electron Cyclotron Resonance Heating system for the Divert
 or Tokamak Test (DTT) relies on a series of mirrors to inject high-frequen
 cy millimetre waves into the reactor vessel. The last launching mirrors tr
 ansmit microwaves directly into the plasma while withstanding extreme cond
 itions in the tokamak ports. Significant challenges include magnetic torqu
 es that could affect steering\, intense heat loads\, and flux of energetic
  neutrals. Developing mirrors that withstand this environment and remain e
 ffective in microwave reflection\, without increasing roughness-related oh
 mic losses\, is crucial. A current investigation involves combining a diel
 ectric ceramic substrate with tungsten coatings to optimize performance an
 d lifetime. In this project\, three types of tungsten multilayers were dep
 osited on ceramic substrates with radio-frequency magnetron sputtering. Th
 e coatings were analysed in their morphology\, composition\, adhesion\, an
 d electrical resistivity\, and exposed to fusion-relevant plasmas in a lin
 ear device. Results indicated good adhesion and maintenance of the coating
 ’s morphology post-exposure. Comparison with an established model sugges
 ted an erosion enhancement mechanism\, and preliminary SRIM-2013 simulatio
 ns explored the impact of impurities on sputtering. Additionally\, a first
  estimation of ohmic losses provided insight into their magnitude. The pro
 ject represents the first experimental study on this innovative approach\,
  and the extensive characterization provided a solid assessment of the coa
 ting production effectiveness and of the coating's main properties.\nSpeak
 er: Alice Buzzoni
LAST-MODIFIED:20260109T092029Z
LOCATION: Seminarraum D3 / Zoom
ORGANIZER;CN=IPP:mailto:
SUMMARY:Wall Forum:  Production and analysis of metallic coatings on cerami
 c substrates for the electron cyclotron heating launching mirror of DTT 
URL;VALUE=URI:https://www.ipp.mpg.de/events/44321/14160
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