New Electromagnetic Measurement Using High-Temperature Superconducting Coil

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In order to realize safe and economic fusion reactors, steady-state plasma operation is required. In this case, rea-time measurement of plasma energy and the feedback control of magnetic configuration is important. For the real-time plasma energy measurement, conventional diamagnetic sensors has been used so far. To apply this to long-pulse operations, new ideas or R&D's are required.For steady-state and real-time measurement of plasma energy there are several methods ; (1)conventional diamagnetic sensor, (2)the utilization of super-conducting coil system, and (3)novel method utilizing high-temperature superconducting sensor systems. Especially, we have been developing novel methods for helical confinement systems.In the case of method (1),it is impossible to measure more than several tens of minutes due to the property of integral circuits. In case (2),it is not easy to measure the plasma energy because of noise from coil power supply and SCR, especially in the case of the normal conducting coil systemIn this research, R&D of the measurement of the utilization of low-temperature superconducting coil in the Large Helical Device (LHD) has been carried out. The demonstration of the diamagnetic measurement method using the high-temperature superconducting sensor Bi2223 has been demonstrated. Moreover, as an extension of this Grand-In-Aid Research, a novel compact and spherical helical magnetic configuration has been explored.