Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Impact of helium implantation and ion-induced damage on reflectivity of molybdenum mirrors
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.ORCID-id: 0000-0002-8760-1137
Vise andre og tillknytning
2016 (engelsk)Inngår i: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584Artikkel i tidsskrift (Fagfellevurdert) Published
Resurstyp
Text
Abstract [en]

Molybdenum mirrors were irradiated with Mo and He ions to simulate the effect of neutron irradiation on diagnostic first mirrors in next-generation fusion devices. Up to 30 dpa were produced under molybdenum irradiation leading to a slight decrease of reflectivity in the near infrared range. After 3×1017 cm-2 of helium irradiation, reflectivity decreased by up to 20%. Combined irradiation by helium and molybdenum led to similar effects on reflectivity as irradiation with helium alone. Ion beam analysis showed that only 7% of the implanted helium was retained in the first 40nm layer of the mirror. The structure of the near-surface layer after irradiation was studied with scanning transmission electron microscopy and the extent and size distribution of helium bubbles was documented. The consequences of ion-induced damage on the performance of diagnostic components are discussed.

sted, utgiver, år, opplag, sider
Elsevier, 2016.
Emneord [en]
Diagnostic mirrors, Fusion, Helium, Ion-induced damage, Molybdenum, Fusion reactions, High resolution transmission electron microscopy, Infrared devices, Ion beams, Ions, Irradiation, Mirrors, Radiation, Reflection, Scanning electron microscopy, Transmission electron microscopy, Helium implantation, Helium irradiation, Implanted helium, Ion beam analysis, Near-infrared range, Near-surface layers, Scanning transmission electron microscopy, Neutron irradiation
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-188336DOI: 10.1016/j.nimb.2016.02.065ISI: 000382413500018Scopus ID: 2-s2.0-85007369348OAI: oai:DiVA.org:kth-188336DiVA, id: diva2:934785
Merknad

QC 20160609

Tilgjengelig fra: 2016-06-09 Laget: 2016-06-09 Sist oppdatert: 2017-11-30bibliografisk kontrollert
Inngår i avhandling
1. Impact of material migration on plasma-facing components in tokamaks
Åpne denne publikasjonen i ny fane eller vindu >>Impact of material migration on plasma-facing components in tokamaks
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Plasma-wall interaction plays an essential role in the performance and safety of a fusion reactor. This thesis focuses on the impact of material migration on plasma-facing components. It is based on experiments performed in tokamaks: JET, TEXTOR and ASDEX Upgrade. The objectives of the experiments were to assess fuel and impurity removal under ion cyclotron wall conditioning (ICWC) and plasma impact on diagnostic mirrors.

In wall conditioning studies, tracer techniques based on the injection of rare isotopes (15N, 18O) were used to determine conclusively the impact of the respective gases. For the first time, probe surfaces and wall components exposed to ICWC were examined by surface analysis methods. Discharges in hydrogen were the most efficient to erode carbon co-deposits, resulting in a reduction of the initial deuterium content by a factor of two. It was also found that impurities desorbed under ICWC are partly re-deposited on the wall.

Plasma impact on diagnostic mirrors was determined by surface analysis of test mirrors exposed at JET. Reflectivity of mirrors from the divertor region was severely decreased due to deposits of beryllium, deuterium, carbon and other impurities. This result points out the need to develop mirror maintenance procedures. Neutron damage on mirrors was simulated by ion irradiation in an ion implanter. It was shown that damage levels similar to those expected in the first wall of a fusion reactor do not produce a significant change in reflectivity.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2016. s. 54
Serie
TRITA-EE, ISSN 1653-5146
Emneord
Fusion, material migration, wall conditioning, diagnostic mirrors, plasma-facing materials
HSV kategori
Forskningsprogram
Fysik
Identifikatorer
urn:nbn:se:kth:diva-190903 (URN)978-91-7729-046-9 (ISBN)
Disputas
2016-09-15, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20160819

Tilgjengelig fra: 2016-08-19 Laget: 2016-08-18 Sist oppdatert: 2016-08-19bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopus

Søk i DiVA

Av forfatter/redaktør
Garcia-Carrasco, AlvaroPetersson, PerHallén, AndersRubel, Marek
Av organisasjonen
I samme tidsskrift
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 98 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf