Modelling of 3D fields due to ferritic inserts and test blanket modules in toroidal geometry at ITER
Journal article, 2016

Computations in toroidal geometry are systematically performed for the plasma response to 3D magnetic perturbations produced by ferritic inserts (FIs) and test blanket modules (TBMs) for four ITER plasma scenarios: the 15 MA baseline, the 12.5 MA hybrid, the 9 MA steady state, and the 7.5 MA half-field helium plasma. Due to the broad toroidal spectrum of the FI and TBM fields, the plasma response for all the n = 1-6 field components are computed and compared. The plasma response is found to be weak for the high-n (n > 4) components. The response is not globally sensitive to the toroidal plasma flow speed, as long as the latter is not reduced by an order of magnitude. This is essentially due to the strong screening effect occurring at a finite flow, as predicted for ITER plasmas. The ITER error field correction coils (EFCC) are used to compensate the n = 1 field errors produced by FIs and TBMs for the baseline scenario for the purpose of avoiding mode locking. It is found that the middle row of the EFCC, with a suitable toroidal phase for the coil current, can provide the best correction of these field errors, according to various optimisation criteria. On the other hand, even without correction, it is predicted that these n = 1 field errors will not cause substantial flow damping for the 15 MA baseline scenario.

3D magnetic fields

ITER TBM

plasma response

Author

Yueqiang Liu

Chalmers, Earth and Space Sciences, Plasma Physics and Fusion Energy

S. Akaslompolo

Aalto University

M. Cavinato

Fusion for Energy

F. Koechl

Culham Lab

Taina Kurki-Suonio

Aalto University

L. Li

Forschungszentrum Jülich

Donghua University

V. Parail

Culham Lab

G. Saibene

Fusion for Energy

K. Sarkimaki

Aalto University

S. Sipila

Aalto University

J. Varje

Aalto University

Nuclear Fusion

0029-5515 (ISSN)

Vol. 56 6 Art. no. 066001- 066001

Subject Categories

Physical Sciences

DOI

10.1088/0029-5515/56/6/066001

More information

Latest update

3/19/2018