Applications of the CCS method to the diagnosis and the control for various types of magnetic confinement devices

CCS method has been used for the control of the real time operation of JT-60U, which verified the effectiveness of this method. This paper takes up devices except JT-60U, which was mentioned in Chapter 2, namely Tokamak devices KSTAR and JT-60SA, spherical Tokamak devices QUEST and CPD, reverse magnetic pinch type device RELAX, and 3-D helical type device LHD, and explains how CCS method was applied and improved in accordance with the particularities of each real device. As for KSTAR, JT-60SA, QUEST, and RELAX, the existence of magnetic materials and the effects of eddy current flowing through the conductive materials such as a vacuum vessel were taken into account. In QUEST and RELAX, in particular, reverse analysis to make eddy current unknown values was performed. In RELAX, it was important to ensure the integration precision of eddy current flowing along the wall of the vacuum vessel. For LHD, new 3-D CCS method, where three components of vector potential were supposed to be unknown, was developed. The uncertainty of measurement signal in QUEST was conquered by regularization technique such as tensor singular value decomposition (TSVD) method or Tikhonov regularization method. In LHD, the number of unknown values is enormous due to its three dimensional system, and in RELAX, Cauchy condition and eddy current density coexist as unknown values. Therefore, the application of TSVD method and improved TSVD method for each was indispensable, and its application methods are introduced. (A.O.)