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Measurement of 2/1 intrinsic error field of Joint TEXT tokamak
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Image of FIG. 1.
FIG. 1.

A diagram showing the position of the SRMP coils and the poloidal and toroidal Mirnov arrays. The SRMP cosine coils are shown in green and the sine ones are in purple.

Image of FIG. 2.
FIG. 2.

The vectors of the 2/1 components of the radial magnetic field at r = a surface produced by SRMP. The amplitudes of the vectors are given in G/kA and the phases are given in the coordinate of CS. E11 is obtained by configuring the coils of cos1, cos2, cos3, sin1, and sin2 as “− + + − +.”

Image of FIG. 3.
FIG. 3.

Evolution of dBθ/dt and its frequency during the ramp up of the SRMP coil current.

Image of FIG. 4.
FIG. 4.

The method used to measure the intrinsic error field by sweeping the phase of the SRMP field. C2 represents the vectors of SRMP field obtained by circle fitting when mode locking occurs and C1 represents the actual locking threshold of total perturbation. The error field is given by the blue vector O1O.

Image of FIG. 5.
FIG. 5.

Distribution of the probes of the poloidal Mirnov array. The probe located at the outermost is numbered the first. The toroidal angle of the poloidal array is 258.75° in CS.

Image of FIG. 6.
FIG. 6.

Computed (dashed) and experimental (solid) Mirnov signals of the 1st (red), 3rd (purple), 5th (cyan), and 23rd (blue) probe of the poloidal array. A1 and A2 are set to 1.04 × 108 and 3.8 × 107 in the computation.


Generic image for table
Table I.

Plasma parameters for torques estimation.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurement of 2/1 intrinsic error field of Joint TEXT tokamak