Journal
PLASMA SCIENCE & TECHNOLOGY
Volume 25, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2058-6272/ace87d
Keywords
EAST; magnetic diagnostics; MHD; disruption; FOCS
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In EAST long-pulsed discharge, the use of electric magnetic diagnosis and magnetic measurement calibration methods play an important role in monitoring and controlling the plasma state and boundary, reducing measurement errors and integrator drift errors, and providing accuracy for the plasma control system.
In EAST long-pulsed discharge (hundreds of seconds), electric magnetic diagnosis (EMD) is very important, since EMD not only monitors tokamak security status but also provides accurate measurement accuracy for reconstruction of the plasma boundary. To avoid current measurement drift, a fiber optic current sensor, based on the Faraday effect, is developed and used for poloidal and plasma current feedback control for the first time, relative current measurement accuracy is within 0.5%. To ensure plasma boundary control accuracy, a detailed set of magnetic measurement calibration methods is developed before the plasma discharge. The maximum relative error is less than 1%, the corresponding control accuracy is within 1 cm. To minimize integrator drift error, a long-pulse integrator test is essential, the corresponding drift error needs to be subtracted in plasma control system. Besides, the saddle coil and Mirnov coil not only help to detect MHD issues, but are also utilized for plasma disruption prediction during the long-pulse discharge.
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