Magnetic diagnostics

The magnetic diagnostic coils will be installed as the sensors of plasma control and in order to measure basic plasma parameters.  The magnetic diagnostic coils include magnetic field probes, Rogowski loops, one turn loops, diamagnetic loops and saddle coils and they are summarized in table 1. The magnetic coils for the poloidal magnetic field measurement will be installed for equilibrium reconstruction and plasma control. These coils will be installed both on the vacuum vessel and on the stabilizing plate.  They are utilized also for low frequency MHD modes. 

Type	Measurement	Number	Channel	Purpose
Magnetic probe for Plasma control	Poloidal magnetic field	23×2	46	Equilibrium reconstruction and plasma control. Low frequency MHD mode.
Magnetic probe for RWM control	Poloidal and radial magnetic field	108 (18(pol) x 6(tor))	216 (17 also for plasma control)	RWM control
Magnetic probe for MHD	Poloidal magnetic perturbation	32 + 9	41	MHD mode measurement
Rogowski loop	Plasma current	4	4	Around the plasma
Rogowski loop	VV eddy current	4	4	Around the vacuum vessel
Rogowski loop	VV eddy current	4	4	Along the inner wall of VV
Rogowski loop	SP eddy current	4	4	Around the stabilizing plate
Oneturn loop	Poloidal flux	34	34	Equilibrium reconstruction and plasma control
Diamagnetic loop	Diamagnetic flux	4 sets	8	Plasma stored energy
Saddle coils	Radial magnetic field	36 (18×2)	36	Low frequency MHD mode.Rotation and non- rotating MHD
Halo current	48	48	48
Total			426

Table 1 Magnetic Diagnostic Coils