First Dust Study in JET with the ITER-Like Wall: Sampling, Analysis and Classification

First Dust Study in JET with the ITER-Like Wall: Sampling, Analysis and Classification

First Dust Study in JET with the ITER-Like Wall: Sampling, Analysis and Classification 150 150 Mathew
CCFE-PR(15)32

First Dust Study in JET with the ITER-Like Wall: Sampling, Analysis and Classification

Results of the first dust survey in JET with the ITER - Like Wall (JET - ILW) are presented. The sampling was performed using adhesive stickers from the divertor tiles where the greatest material deposition was detected after the first JET - ILW campaign in 2011 - 2012. The emphasis was especially on metal particles (Be and W) with the aim to determine the composition, size, surface topography and internal dust structure using a large set of methods: high - resolution scanning and transmission electron microscopy, focused ion beam, electron diffraction and also wavelength and energy dispersive X - ray spectroscopy. The most important was the identification of beryllium dust both in the form of flakes and droplets of diameter in the micrometer range. Tungsten, molybdenum, inconel constituents were identified along with many impurity species. The origin of various constituents in dust and also categories of particles are discussed.

Collection:
Journals
Journal:
Nuclear Fusion
Publisher:
IOP
Published date:
10/01/2015