识别TdeV托卡马克等离子体的边界和中心位置

用虚壳原理可以得到TdeV托卡马克等离子体边界、电流中心和X点，用最小二乘法可以确定Glad-Shafranov方程解中的待定参数。用探针测量极向磁场，初始时等离子体电流被看作是线电流，然后被虚壳电流代替。这个虚壳电流在等离子体内部产生负的约束磁场，在等离子体外部产生的磁场与等离子体电流产生的磁场一致，所用的叠代法充分快，可以在两次放电间给出等离子体图象，重建的位形与TV成像非常一致。

IDENTIFICATION OF PLASMA BOUNDARY AND POSITION FOR THE TdeV TOKAMAK

Using a virtual-casing principle,the plasma boundary,plasma current center and X-point are identified for Tokamak de Varennes.Adaptive parameters in a polynomial,which is a solution of the Glad-Shafranov equation,are determined by a least square fit of the poloidal magnetic fields.Measurement of the magnetic field is performed using pick-up coils.The plasma current is initially regarded as one filament,then it is replaced by virtual-case currents,which produce a negative with same magnitudes confinement magnetic field inside the plasma.The iterative method is fast enough to get a picture for the plasma between the shots.The configuration reconstructed is in good agreement with the TV image taken by camera with a toroidal view.