EC assisted start-up experiments reproduction in FTU and AUG for simulations of the ITER case

G. Granucci, D. Ricci, M. Cavinato, D. Farina, L. Figini, M. Mattei, J. Stober, O. Tudisco

Research output: Contribution to conferencePaper

Abstract

The breakdown and plasma start-up in ITER are well known issues studied in the last few years in many tokamaks with the aid of calculation based on simplified modeling. The thickness of ITER metallic wall and the voltage limits of the Central Solenoid Power Supply strongly limit the maximum toroidal electric field achievable (0.3 V/m), well below the level used in the present generation of tokamaks. In order to have a safe and robust breakdown, the use of Electron Cyclotron Power to assist plasma formation and current rump up has been foreseen. This has raised attention on plasma formation phase in presence of EC wave, especially in order to predict the required power for a robust breakdown in ITER. Few detailed theory studies have been performed up to nowadays, due to the complexity of the problems. A simplified approach, extended from that proposed in ref[1] has been developed including a impurity multispecies distribution and an EC wave propagation and absorption based on GRAY code. This integrated model (BK0D) has been benchmarked on ohmic and EC assisted experiments on FTU and AUG, finding the key aspects for a good reproduction of data. On the basis of this, the simulation has been devoted to understand the best configuration for ITER case. The dependency of impurity distribution content and neutral gas pressure limits has been considered. As results of the analysis a reasonable amount of power (1 - 2 MW) seems to be enough to extend in a significant way the breakdown and current start up capability of ITER. The work reports the FTU data reproduction and the ITER case simulations. © 2014 AIP Publishing LLC.
Original languageEnglish
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event20th Topical Conference on Radiofrequency Power in Plasmas - , Italy
Duration: 1 Jan 2014 → …

Conference

Conference20th Topical Conference on Radiofrequency Power in Plasmas
CountryItaly
Period1/1/14 → …

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Granucci, G., Ricci, D., Cavinato, M., Farina, D., Figini, L., Mattei, M., ... Tudisco, O. (2014). EC assisted start-up experiments reproduction in FTU and AUG for simulations of the ITER case. Paper presented at 20th Topical Conference on Radiofrequency Power in Plasmas, Italy. https://doi.org/10.1063/1.4864596