Kalman filter density reconstruction in ICRH discharges on ASDEX Upgrade

被引:6
作者
Bosman, T. O. S. J. [1 ,2 ,3 ]
Kudlacek, O. [4 ]
Fable, E. [4 ]
van Berkel, M. [3 ]
Felici, F. [5 ]
Bock, A. [4 ]
Luda, T. [4 ]
de Baar, M. R. [1 ,3 ]
机构
[1] Eindhoven Univ Technol, Dept Mech Engn, Control Syst Technol Grp, POB 513, NL-5600 MB Eindhoven, Netherlands
[2] Eindhoven Univ Technol, Dept Appl Phys, Sci & Technol Nucl Fus Grp, POB 513, NL-5600 MB Eindhoven, Netherlands
[3] DIFFER Dutch Inst Fundamental Energy Res, Energy Syst & Control Grp, POB 6336, Eindhoven, Netherlands
[4] Max Planck Inst Plasma Phys, Garching, Germany
[5] Ecole Polytech Fed Lausanne EPFL, Swiss Plasma Ctr, CH-1015 Lausanne, Switzerland
关键词
Density reconstruction; AUG; Kalman filter; LIMITS; INTERFEROMETRY; INVERSION;
D O I
10.1016/j.fusengdes.2021.112510
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
Plasma density is one of the key quantities that need to be controlled in real-time as it scales directly with fusion power and, if left uncontrolled, density limits can be reached leading to a disruption. On ASDEX Upgrade (AUG), the real-time measurements are the line-integrated density, measured by the interferometers, and the average density derived from the bremsstrahlung measured by spectroscopy. For control, these measurements are used to reconstruct the radial density profile using an extended Kalman filter (EKF). However, in discharges where ion cyclotron resonance heating (ICRH) is used, the measurements from the interferometers are corrupted and the reconstructed density is false. In this paper, the existing EKF implementation is improved, implemented and experimentally verified on AUG. The new EKF includes a new particle transport model in the prediction model RAPDENS as well as a new representation of ionization and recombination. Furthermore, an algorithm was introduced that is capable of detecting the corrupt diagnostics; this algorithm is based on the rate of change of the innovation residual. The changes to the RAPDENS observer resulted in better density reconstruction in ICRH discharges where corrupt measurement occur. The new version has been implemented on the real-time control system at AUG and functions properly in ICRH discharges.
引用
收藏
页数:11
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