Data analysis methods and applications of the eddy current diagnostic system in the Keda Torus eXperiment device

Abstract

Since the establishment of the eddy current diagnostic system within the Keda Torus eXperiment (KTX) device, it has unveiled many applications. Recent developments have introduced innovative data analysis techniques alongside compelling experimental results, underscoring the necessity for a comprehensive summary of the system's data analysis approaches and broad applications. Notable features of the system encompass exceptional precision, the ability to encompass shell currents on the entirety of the closed boundary, vector detection of shell currents, and measurement of diverse physical quantities. In terms of data analysis methodologies, meticulous scrutiny of the null field region is conducted, and we reveal a distinctive characteristic within the complex shell current signals, namely the asymmetry of the amplitudes of ±n Fourier coefficients. Moreover, the Hodge decomposition emerges as a pivotal technique, allowing for the distinctive separation of shell currents into three orthogonal components based on their distinct spatial topological properties. With regard to practical applications, an in-depth examination of the vector potential and magnetic helicity flux densities are presented in detail, further highlighting the far-reaching utility of the system's capabilities.

Effects of magnetic helicity on 3D equilibria and self-organized states in KTX reversed field pinch

“…Figure 8 shows this relationship. The helicity flux density measurement system is implemented in KTX, and a similar linear relationship was obtained [28,32]. For KTX, when the average toroidal magnetic field ⟨B t ⟩ ≈ 0.26 T, we estimate that a plasma current of about 0.6 MA is needed to spontaneously transform into a three-dimensional state and when the current reaches 0.72 MA, the plasma can self-organize to form the SHAx state.…”