EAST alternative magnetic configurations: modelling and first experiments

Heat and particle loads on the plasma facing components are among the most challenging issues to be solved for a reactor design. Alternative magnetic configurations may enable tokamak operation with a lower peak heat load than a standard single null (SN) divertor. This papers reports on the creation...

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Bibliographic Details
Published in:Nuclear fusion 2015-08, Vol.55 (8), p.83005-11
Main Authors: Calabrò, G., Xiao, B.J., Chen, S.L., Duan, Y.M., Guo, Y., Li, J.G., Liu, L., Luo, Z.P., Wang, L., Xu, J., Zhang, B., Albanese, R., Ambrosino, R., Crisanti, F., Pericoli Ridolfini, V., Villone, F., Viola, B., Barbato, L., De Magistris, M., De Tommasi, G., Giovannozzi, E., Mastrostefano, S., Minucci, S., Pironti, A., Ramogida, G., Tuccillo, A.A., Zagórski, R.
Format: Article
Language:English
Subjects:
alternative divertor configuration
Confinement
experiment
Nuclear fusion
Reactor design
Simulation
Superconductivity
tokamak
Tokamak devices
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Summary:Heat and particle loads on the plasma facing components are among the most challenging issues to be solved for a reactor design. Alternative magnetic configurations may enable tokamak operation with a lower peak heat load than a standard single null (SN) divertor. This papers reports on the creation and control of one of such alternatives: a two-null nearby divertor configuration. An important element of this study is that this two-null divertor was produced on a large superconducting tokamak as an experimental advanced superconducting tokamak. A preliminary experiment with the second null forming a configuration with significant distance between the two nulls and a contracting geometry near the target plates was performed in 2014. These configurations have been designed using the FIXFREE code and optimized with CREATE-NL tools and are discussed in the paper. Predictive edge simulations using the TECXY code are also presented by comparing the advanced divertor and SN configuration. Finally, the experimental results of ohmic and low confinement (L-mode) two-null divertor and SN discharges and interpretative two-dimensional edge simulations are discussed. Future experiments will be devoted to varying the distance between the two nulls in high confinement (H-mode) discharges.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/55/8/083005