Abstract
Space and time resolved measurements of the impurity particle fluxes in the scrape off layer (SOL) have been made on Frascati Tokamak Upgrade (FTU) by means of deposition probes. In this work experimental results are presented for ohmic plasma discharges with a molybdenum toroidal limiter, and with B T =6 T,I P =0.7 MA, n ̄ e = (0.8–1.3) ×10 20 m −3 . In the stationary phase the total collected molybdenum flux shows a large asymmetry between the electron and the ion side of the probes and the radial profiles are generally quite flat at low density. Simulations of the FTU SOL with the 2D multifluid numerical code EPIT reproduce the profile flatness only if a high perpendicular diffusion coefficient is assumed for the impurities. The code shows that the e −/i + asymmetry can be accounted for by the shorter magnetic connection length on the e − side (2.2 against 7 m).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
