Note: Development of a multichannel magnetic probe array for magnetohydrodynamic activity studies in Sino-United Spherical Tokamak

The Review of Scientific Instruments
H ZhongZhe Gao

Abstract

A 30-channel movable magnetic probe radial array measuring the poloidal magnetic field's time derivative Ḃθhas been developed and installed on the Sino-United Spherical Tokamak to investigate the magnetohydrodynamic (MHD) activities in ohmic discharges. The probe array consists of thirty identical commercial chip inductors mounted on a slim printed circuit board and shielded by a customized quartz tube of 14 mm in outer diameter. With the application of instrumentation amplifiers, the system exhibits a good signal to noise ratio and the measured vertical field spatial distribution agrees well with the simulation result. The measured spatial and temporal distribution of Ḃθduring the MHD activities exhibits a clear phase reversal layer, which is a direct proof of tearing mode and provides a reliable indication of the magnetic island chain position.

References

Nov 3, 2010·The Review of Scientific Instruments·M W BongardA J Redd
Nov 7, 2012·The Review of Scientific Instruments·H GotaM Tuszewski

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Citations

Jul 11, 2021·The Review of Scientific Instruments·Zhengbo ChengWenbin Liu

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