The Determination of the Current Center Line of the TF Coils of ITER

Knaster, J.; Baynham, E.

doi:10.1109/tasc.2009.2039863

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…the position of point A of the CCL of the WP would have a positioning tolerance defined by an ellipse with minor and major radius (3.5 mm, 6 mm) centered in the theoretical position of the CCL [17], but the reality is that the manufactured position of the WP CCL, transferred within a tolerance of 0.3 mm to the TF coil case external walls, will serve as reference for the coil alignment. Both teams coincided in assigning the major contributions to the shift and tilt of the innermost CS modules CS1U and CS1L, the CS stack shift, and in particular the TF coils.…”

Section: Summary Of Results Of Error Field Calculationsmentioning

confidence: 99%

ITER non-axisymmetric error fields induced by its magnet system

Knaster

Amoskov

Formisano

et al. 2011

Fusion Engineering and Design

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Section: Summary Of Results Of Error Field Calculationsmentioning

confidence: 99%

ITER non-axisymmetric error fields induced by its magnet system

Knaster

Amoskov

Formisano

et al. 2011

Fusion Engineering and Design

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“…1, is the core of the TF magnets with its Dshape weighing 110 tons, measuring about 13 m high and 8 m wide, and with 134 winding turns. The CCL is defined as the geometrical barycenter of all the conductors in the cross-section plane (local 2D transverse frame) of the WP [3].…”

Section: Toroidal Field Coilmentioning

confidence: 99%

“…The measurement principle uses the symmetries of the WP to establish the displacement in the 2D local frame along the TF coil [3]. The Biot Savart law, (2), gives the magnetic flux density generated by a current line,…”

Section: Displacement Estimatementioning

confidence: 99%

“…Geometrical tracking of CCL location through these steps is complex. An accurate determination of the coil CCL is important since it becomes the reference for survey operations during the insertion and final installation phase [3]. Therefore, it is considered essential to learn the location of the CCL of the finished WP by undertaking warm magnetic measurements to determine its locus with precision better than 1 mm.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Measurement of the Current Center Line of the Toroidal Field Coil of ITER at Room Temperature

Deniau

Baynham²,

Buzio

et al. 2012

IEEE Trans. Appl. Supercond.

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Geometrical deformations and assembly errors in the ITER Toroidal Field (TF) coils will lead to magnetic field perturbations, which could degrade plasma confinement and eventually lead to disruption. Extensive computational studies of the influence of coil deformations and assembly errors on plasma behavior have given the basis for definition of the geometric tolerance of the Current Centre Line (CCL) of the winding pack of the TF coil. This paper describes an analysis method to establish the feasibility to measure the magnetic CCL locus of the final winding pack (WP) with accuracy better than 1 mm. The proposed method is based on arrays of gradient coils accurately mounted with respect to the WP fiducial marks and datum surfaces. The magnetic measurements will be performed at defined locations around the WP perimeter to characterize accurately the CCL locus. The analysis emphases the robustness and sensitivity of the method versus the measurement location and the TF coil 3D geometrical deformation. The analysis and proposed measurement techniques will be described in detail.Presented at the 22nd International Conference on Magnet Technology 12-16 September 2011, Marseille, France Geneva, Switzerland CERN-ATS-2012-048February 2012 Abstract 4KP1-6 1Abstract-Geometrical deformations and assembly errors in the ITER Toroidal Field (TF) coils will lead to magnetic field perturbations, which could degrade plasma confinement and eventually lead to disruption. Extensive computational studies of the influence of coil deformations and assembly errors on plasma behavior have given the basis for definition of the geometric tolerance of the Current Centre Line (CCL) of the winding pack of the TF coil. This paper describes an analysis method to establish the feasibility to measure the magnetic CCL locus of the final winding pack (WP) with accuracy better than 1 mm. The proposed method is based on arrays of gradient coils accurately mounted with respect to the WP fiducial marks and datum surfaces. The magnetic measurements will be performed at defined locations around the WP perimeter to characterize accurately the CCL locus. The analysis emphases the robustness and sensitivity of the method versus the measurement location and the TF coil 3D geometrical deformation. The analysis and proposed measurement techniques will be described in detail.

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“…For ITER magnets [2], the reference CCL of the toroidal field (TF) coils is defined [3]. Several contributions modeling such a measurement [4], [5], [6], [7], describing the validation of the measurement procedures [8], [9] as well as discussing manufacturing [10], [11] and assembly [12], [13] issues are available.…”

mentioning

confidence: 99%

Magnetic Determination of the Current Center Line for the Superconducting ITER TF Coils

Lerch

Buhagiar

Wassmer

et al. 2015

IEEE Trans. Appl. Supercond.

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The ITER tokamak includes 18 superconducting D-shaped toroidal field (TF) coils. Unavoidable shape deformations as well as assembly errors will lead to error fields in the final configuration, which can be modeled with the knowledge of the current center line (CCL). We are building a room temperature magnetic measurement system using low frequency ac excitation current through the TF coil and arrays of pick-up coils, fabricated with printed circuit board technology. Deviations from the expected shape of the CCL will be obtained by comparing the amplitude of magnetic flux measured at several locations around the perimeter of the TF coil, with values computed assuming the nominal current distribution. We present experimental results obtained with a cable placed in one turn groove of a full scale radial plate.

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The Determination of the Current Center Line of the TF Coils of ITER

Cited by 9 publications

References 5 publications

ITER non-axisymmetric error fields induced by its magnet system

ITER non-axisymmetric error fields induced by its magnet system

Magnetic Measurement of the Current Center Line of the Toroidal Field Coil of ITER at Room Temperature

Magnetic Determination of the Current Center Line for the Superconducting ITER TF Coils

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