Note: A calibration method to determine the lumped-circuit parameters of a magnetic probe.

This paper describes a novel method to determine the lumped-circuit parameters of a magnetic inductive probe for calibration by using Helmholtz coils with high frequency power supply (frequency range: 10 kHz-400 kHz). The whole calibration circuit system can be separated into two parts: "generator" circuit and "receiver" circuit. By implementing the Fourier transform, two analytical lumped-circuit models, with respect to these separated circuits, are constructed to obtain the transfer function between each other. Herein, the precise lumped-circuit parameters (including the resistance, inductance, and capacitance) of the magnetic probe can be determined by fitting the experimental data to the transfer function. Regarding the fitting results, the finite impedance of magnetic probe can be used to analyze the transmission of a high-frequency signal between magnetic probes, cables, and acquisition system.

[1]  S. Mirnov.  A probe method for measuring the displacement of the current channel in cylindrical and toroidal discharge vessels , 1965 .

[2]  J. Booske,et al.  Broadband calibration for magnetic probes for use in the Maryland spheromak , 1987 .

[3]  T. Shi,et al.  Experimental observation of beta-induced Alfvén eigenmodes during strong tearing modes on the EAST tokamak in fast-electron plasmas , 2013 .

[4]  S. Sharapov,et al.  First evidence of Alfvén wave activity in KSTAR plasmas , 2013, 1301.4708.

[5]  Ming Zhang,et al.  The reconstruction and research progress of the TEXT-U tokamak in China , 2011 .

[6]  W. Amatucci,et al.  Broadband calibration of radio-frequency magnetic induction probes , 2006 .

[7]  Ambrogio Fasoli,et al.  Fast magnetic fluctuation diagnostics for Alfvén eigenmode and magnetohydrodynamics studies at the Joint European Torus , 2000 .

[8]  L. C. Appel,et al.  Calibration of the high-frequency magnetic fluctuation diagnostic in plasma devices , 2005 .

[9]  K. W. Gentle,et al.  Diagnostics for magnetically confined high-temperature plasmas , 1995 .

[10]  E. J. Strait,et al.  Magnetic diagnostic system of the DIII-D tokamak , 2006 .

[11]  Q. Hu,et al.  Observation of beta-induced Alfvén Eigenmode in J-TEXT tokamak , 2015 .

[12]  CurrentDrive,et al.  Chapter?8: Plasma operation and control , 1999 .

[13]  G. Yuan,et al.  Observation of energetic-particle-induced GAM and nonlinear interactions between EGAM, BAEs and tearing modes on the HL-2A tokamak , 2013 .

[14]  L. Zakharov,et al.  Phenomenology of major and minor disruptions in high β deuterium and tritium tokamak fusion test reactor plasma , 1998 .

[15]  E. B. Turner,et al.  Construction and Calibration Techniques of High Frequency Magnetic Probes , 1965 .

[16]  F. Hofmann,et al.  Magnetic measurements on the TCV tokamak , 1998 .