Cross-field and parallel dynamics of SOL filaments in TCV

Abstract Using recently installed scrape-off layer diagnostics on the tokamak à configuration variable, we characterise poloidal and parallel properties of turbulent filaments. We access both attached detached divertor conditions across a wide range core densities ( f G ? [0.09, 0.66]) in diverted L-mode plasma configurations. With gas puff imaging (GPI) diagnostic at outer midplane observed filaments with monotonic increase radial velocity (from 390 m s ?1 to 800 ) cross-field radii 8.5 mm 13.4 mm) increasing density. Interpreting filament behaviour context two-region model by Myra et al (2006 Phys. Plasmas 13 112502), find that they populate ideal-interchange regime C i discharges very low densities, resistive X RX )-point for all other discharges. The scaling versus size shows good agreement this interpretation. These results are discussed compared previous probe-based measurements similar conditions, which mostly placed TCV ballooning RB (Tsui 2018 25 072506). In addition, first time TCV, extension is studied magnetically aligning GPI outboard reciprocating probe divertor. being RX-point regimes, found extend beyond X-point into leg.