Tritium transport experiments on the JET tokamak

• Published in: Plasma physics and controlled fusion Vol. 46; no. 12B; pp. B255 - B265
• Main Authors: Zastrow, K-D, Adams, J M, Baranov, Yu, Belo, P, Bertalot, L, Brzozowski, J H, Challis, C D, Conroy, S, de Baar, M, de Vries, P, Dumortier, P, Ferreira, J, Garzotti, L, Hender, T C, Joffrin, E, Kiptily, V, Mailloux, J, McDonald, D C, Neu, R, O'Mullane, M, Nave, M F F, Ongena, J, Popovichev, S, Stamp, M, Stober, J, Stork, D, Voitsekhovitch, I, Valovič, M, Weisen, H, Whiteford, A D, Zabolotsky, A
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Bristol IOP Publishing 01.12.2004; Institute of Physics
• Subjects: confinement; Exact sciences and technology; Magnetic confinement and equilibrium; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; plasma; Plasma macroinstabilities (magnetohydrodynamic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, rayleigh-taylor, etc.); Plasma properties; Tokamaks; Transport properties; Waves, oscillations, and instabilities in plasmas and intense beams; ICR heating; Tritium; Edge localized modes; Experimental study; Internal transport barrier; JET tokamak; H-mode plasma confinement; Reviews; Magnetic confinement; Plasma instability; Sawtooth instability; Tearing instability; Test method; Neutron emission; Plasma transport processes; Confined plasma; Fusion reactor fuel
• ISSN: 0741-3335; 1361-6587; 1361-6587
• DOI: 10.1088/0741-3335/46/12B/022

An overview is given of the experimental method, the analysis technique and the results for trace tritium experiments conducted on the JET tokamak in 2003. Observations associated with events such as sawtooth collapses, neo-classical tearing modes and edge localized modes are described. Tritium transport is seen to approach neo-classical levels in the plasma core at high density and low q(95), and in the transport barrier region of internal transport barrier (ITB) discharges. Tritium transport remains well above neo-classical levels in all other cases. The correlation of the measured tritium diffusion coefficient and convection velocity for normalized minor radii r/a = [0.65, 0.80] with the controllable parameters q95 and plasma density are found to be consistent for all operational regimes (ELMy H-mode discharges with or without ion cyclotron frequency resonance heating, hybrid scenario and ITB discharges). Scaling with local physics parameters is best described by gyro-Bohm scaling with an additional inverse beta dependence.