Numerical Scaling with the COREDIV Code of JET Discharges with the ITER-Like Wall

• Published in: Contributions to plasma physics (1988) Vol. 54; no. 4-6; pp. 347 - 352
• Main Authors: Telesca, G., Ivanova-Stanik, I., Zagörski, R., Brezinsek, S., Giroud, C., Van Ooost, G., JET EFDA contributors
• Format: Journal Article
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.06.2014; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: Core plasma; Density; Edge plasma; Electron density; Flux; impurity; Integrated modelling; JET; Mathematical models; Nonlinearity; Plasma physics; Transport; Walls
• ISSN: 0863-1042; 1521-3986
• DOI: 10.1002/ctpp.201410052

After the code parameters have been fixed by the numerical modeling of a well diagnosed JET pulse, the electron density and the input power have been changed, resulting in 4 density scans (〈ne〉 in the range 3.8 – 8.2 x 1019m‐3) at Pin = 17, 22, 27, 32 MW. At any given power level, W flux decreases with increasing 〈ne〉 as a consequence of the decrease in Te at the target plates. Also the W concentration in the core (cW) decreases, but this not necessarily leads to reduced core radiation. Indeed, while at high Pin the core radiation decreases with density, at low Pin it increases. At high 〈ne〉 the increase in the input power leads to enhanced PradPrad, leaving, however, nearly unchanged the power radiated fraction frad Indeed, the increase in frad withPin is observed only at low 〈ne〉, up to a level of about frad = 0.4. These numerical results, linked to the non‐linear self‐consistent physics of W production and transport, suggest the best conditions are achieved when the level of the electron density is adapted to the level of the available Pin. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)