Theoretical and experimental studies on molybdenum and stainless steel mirrors cleaning by high repetition rate laser beam
2011 (English)In: Fusion engineering and design, ISSN 0920-3796, Vol. 86, no 9-11, 1728-1731 p.Article in journal (Refereed) Published
Our studies were aimed to determine the damage threshold of molybdenum (Mo) and stainless steel (SS) mirrors to provide the maximum fluence which the mirror surfaces could withstand without affecting their reflectivity properties. A high repetition rate ytterbium fiber laser (20 kHz, 1.06 mu m, 120 ns) was applied. The experimental single-pulse and multiple-pulse damage thresholds were obtained. To calculate damage thresholds, a 1D analytical model which takes into account the temperature dependent absorptance and multiple-pulse damage based on plastic deformations accumulation was applied. The experimental damage thresholds and the theoretical ones are in a good agreement. Cleaning tests with the contaminated mirrors exposed in JET have been performed.
Place, publisher, year, edition, pages
2011. Vol. 86, no 9-11, 1728-1731 p.
Laser cleaning, Damage thresholds, Molybdenum, Stainless steel, Diagnostic mirror
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-58824DOI: 10.1016/j.fusengdes.2010.12.068ISI: 000297824000037ScopusID: 2-s2.0-80054050558OAI: oai:DiVA.org:kth-58824DiVA: diva2:474156
QC 201201092012-01-092012-01-092012-01-09Bibliographically approved