Design and construction of high-frequency magnetic probe system on the HL-2A tokamak

Abstract

A high-frequency magnetic probe system is designed, calibrated and constructed on the HL-2A tokamak. To investigate the factors which affect the probe frequency response, the inductance and capacitance in the probe system are analyzed using an equivalent circuit. Suitable sizes and turn number of the coil, and the length of transmission cable are optimized based on the theory and detailed test in the calibration. To deal with the frequency response limitation and bake-out, the ceramic grooved technique is used and the probe is wound with a bare copper wire. A cascade filter is manufactured with a suitable bandwidth as well as a good phase consistency between channels. The system has been used in the experiment to measure high frequency (≤300 kHz) magnetohydrodynamic fluctuations, which can meet the requirement of physical analysis on HL-2A.

A new electromagnetic probe array diagnostic for analyzing electrostatic and magnetic fluctuations in EAST plasmas

“…In fusion plasma research, magnetic probes are widely used for taking stationary and fluctuating magnetic field measurements, such as in DIII-D [1,2], Alcator C-Mod [3], NSTX-U [4], JET [5], ASDEX Upgrade [6,7], MAST [8], TCV [9], WEST [10], EAST [11,12], T-10 [13], HL-2A [14], J-TEXT [15,16], KTX [17], SUNIST [18,19], KSTAR [20], W7-X [21], LHD [22], and H-1NF [23], etc. The electrostatic probes are also frequently employed to provide the plasma potential, electron density and temperature and many other physical parameter measurements in the scape-off layer or divertor region [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”