24Datasets that include only the PM elemental composition and no other important constituents such as 25 ions and OC, should be treated carefully when used for source apportionment. This work is 26 demonstrating how a source apportionment study utilizing PMF 5.0 enhanced diagnostic tools can 27 achieve an improved solution with documented levels of uncertainty for such a dataset.The uncertainty 28 of the solution is rarely reported in source apportionment studies or it is reported partially. Reporting 29 the uncertainty of the solution is very important especially in the case of small datasets. PM2.5 samples 30 collected in Patras during the year 2011 were used. The concentrations of 22 elements (Z=11-33) were 31 determined using PIXE. Source apportionment analysis revealed that PM2.5 emission sources were 32 biomass burning (11%), sea salt (8%), shipping emissions (10%), vehicle emissions (33%), mineral dust 33 (2%) and secondary sulfates (33%) while unaccounted mass was 3%. Although Patras city center is 34 located in a very close proximity to the city's harbor, the contribution of shipping originating emissions 35 was never before quantified. As rotational stability is hard to be achieved when a small dataset is used 36 the rotational stability of the solution was thoroughly evaluated. A number of constraints were applied 37 to the solution in order to reduce rotational ambiguity. 38 39

The provision of a particle and power exhaust solution which is compatible with first-wall components and edge-plasma conditions is a key area of present-day fusion research and mandatory for a successful operation of ITER and DEMO. The work package plasma-facing components (WP PFC) within the European fusion programme complements with laboratory experiments, i.e. in linear plasma devices, electron and ion beam loading facilities, the studies performed in toroidally confined magnetic devices, such as JET, ASDEX Upgrade, WEST etc. The connection of both groups is done via common physics and engineering studies, including the qualification and specification of plasma-facing components, and by modelling codes that simulate edge-plasma conditions and the plasma-material interaction as well as the study of fundamental processes. WP PFC addresses these critical points in order to ensure reliable and efficient use of conventional, solid PFCs in ITER (Be and W) and DEMO (W and steel)

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