Author/Authors :
Wisse، نويسنده , , M. and Marot، نويسنده , , L. and Widdowson، نويسنده , , A. and Rubel، نويسنده , , M. and Ivanova، نويسنده , , D. and Petersson، نويسنده , , P. and Doerner، نويسنده , , R.P. and Baldwin، نويسنده , , M.J. and Likonen، نويسنده , , J. and Alves، نويسنده , , E. and Hakola، نويسنده , , A. and Koivuranta، نويسنده , , S. and Steiner، نويسنده , , R. and Meyer، نويسنده , , E.، نويسنده ,
Abstract :
A set of seven polycrystalline mirror samples retrieved from the JET tokamak has been cleaned in vacuum using a pulsed laser system. The surfaces of samples exposed to plasma during 2008–2009 campaigns as part of the second phase of a comprehensive first mirror test contained a mixture of carbon, beryllium and tritium. For this reason, the samples were treated in a vacuum chamber constructed specially for this purpose. In some cases mirrors show an increase of the specular reflectivity after cleaning, though beryllium and carbon deposits were not fully removed. Additionally, three samples coated in PISCES-B with a 110–120 nm beryllium layer were subjected to laser cleaning tests as well.
Keywords :
Laser cleaning , Beryllium , ITER , First mirrors
