Performance of an ITER CS1 Model Coil Conductor Under Transverse Cyclic Loading up to 40,000 Cycles

Nijhuis, A.; Ilyin, Y.; Abbas, Wouter; Haken, Bernard ten; Kate, H. Ten

doi:10.1109/tasc.2004.830666

Cited by 47 publications

(57 citation statements)

References 11 publications

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“…The total compression of the bundle goes up to 1100 m with a plastic component of roughly less than 50%. This is in good agreement with the dimensions of the cross section measured after the experiment [8].…”

Section: Cable Compression By Accumulated Loadsupporting

confidence: 90%

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Effect of Periodic Cyclic Deformation on the Voltage Current Transition of<tex>$hboxNb_3hboxSn$</tex>Strands Tested in the Novel ‘TARSIS’ Setup

Nijhuis

Ilyin

Wessel

et al. 2004

IEEE Trans. Appl. Supercond.

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Abstract-The sizable Nb 3 Sn Cable-In-Conduit Conductors (CICC) destined for the high field magnets in the International Thermonuclear Experimental Reactor (ITER), engender large transverse forces on the strands pressing the cable against one side of the inner conduit wall. This causes transverse compressive strain in the strands' crossover contacts accompanied by possible pinching and bending strain on top of the strain induced by the differential thermal contraction of the various conductor components. In the "Test ARangement for Strain Influence on Strands" (TARSIS), the influence of various principle deformation states (mechanical elasto-plastic behavior) that occur in a CICC can be studied separately and combined. Beside precise displacement and force measurements for stress-strain analysis, the voltage-current characteristics can be studied on strands from virgin state toward multi-cyclic loading. Here we present the first results on periodical strand bending with cyclic loading using four different bending wavelengths.

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Section: Cable Compression By Accumulated Loadsupporting

confidence: 90%

“…Fig. 4 shows the curves, compression versus applied force, of a Central Solenoid (CS1) conductor for various numbers of cycling and two applied peak loads [8]. A first press peak load of 450 kN/m is taken as an average for electromagnetic loading under ITER magnet operating conditions.…”

Section: Cable Compression By Accumulated Loadmentioning

confidence: 99%

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of<tex>$hboxNb_3hboxSn$</tex>Strands Tested in the Novel ‘TARSIS’ Setup

Nijhuis

Ilyin

Wessel

et al. 2004

IEEE Trans. Appl. Supercond.

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“…The values of E for ITER relevant Nb 3 Sn strand are reported to be on the order of 10 11 Pa for the axial modulus and on the order of 10 9 Pa for the transverse modulus at 4 K [11,[21][22][23][24][25][47][48][49][50][51][52]. Using these values, however, calculations show that direct axial strain in the Nb 3 Sn strands from axial stress is too small.…”

Section: Possible Link With Strand Strain Relaxationmentioning

confidence: 99%

Comparisons of internal self-field magnetic flux densities between recent Nb₃Sn fusion magnet CICC cable designs

Kwon¹

2016

Progress in Superconductivity and Cryogenics

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The Cable-In-Conduit-Conductor (CICC) for the ITER tokamak Central Solenoid (CS) has undergone design change since the first prototype conductor sample was tested in 2010. After tests showed that the performance of initial conductor samples degraded rapidly without stabilization, an alternate design with shorter sub-cable twist pitches was tested and discovered to satisfy performance requirements, namely that the minimum current sharing temperature (T cs ) remained above a given limit under DC bias. With consistent successful performance of ITER CS conductor CICC samples using the alternate design, an attempt is made here to revisit the internal electromagnetic properties of the CICC cable design to identify any correlation with conductor performance. Results of this study suggest that there may be a simple link between the Nb 3 Sn CICC internal self-field and its T cs performance. The study also suggests that an optimization process should exist that can further improve the performance of Nb 3 Sn based CICC.

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“…[5][6][7] The investigations of mechanical properties of cables under transverse electromagnetic loads have been tried and studied by many researchers. [8][9][10][11] However, the main factors that affect the thermodynamic behavior in the cross section of this complex geometry are still not well understood. 12 Various CICC configurations had been designed, produced and tested since the concept was first proposed by Hoenig et al 13 In most of the applications to date, CICCs are cooled by internal convection and the flow of liquid helium.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on transverse heat transfer properties in cross section of full size Nb3Sn CICC ITER conductor

2015

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The contact mechanical characteristics in the cross section of the Nb3Sn cable are sensitive to the cryogenic cooling and cyclic transverse electromagnetic loads, which may affect the cable’s performance. In this paper, based on a proposed discrete dynamic model (DEM), where the contact heat transfer among strands and the convective heat transfer in liquid helium are taken into account, the cooling process under two heat transfer mechanisms is performed. Simulation results show that the temperature variation of Poloidal Field Insert Sample (PFIS) cable with time agrees well with the existing experimental results, and the role of contact heat transfer cannot be neglected during cryogenic cooling. It is obtained from the further analysis that the effect of contact heat transfer becomes more prominent with the decrease of mass flow rate of liquid helium, which leads to the stress status within cable changed significantly. With the temperature boundary condition imposed on the cable radial direction, the effective thermal conductivity (ETC) of cable can be obtained. It can be found that the ETC increases with increasing the transverse loads and is sensitive to the low temperature environment, while it is not affected by load cycles basically. These results may provide the guide for the design and application of the future CICC conductors.

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Performance of an ITER CS1 Model Coil Conductor Under Transverse Cyclic Loading up to 40,000 Cycles

Cited by 47 publications

References 11 publications

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of<tex>$hboxNb_3hboxSn$</tex>Strands Tested in the Novel ‘TARSIS’ Setup

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of<tex>$hboxNb_3hboxSn$</tex>Strands Tested in the Novel ‘TARSIS’ Setup

Comparisons of internal self-field magnetic flux densities between recent Nb₃Sn fusion magnet CICC cable designs

Numerical investigation on transverse heat transfer properties in cross section of full size Nb3Sn CICC ITER conductor

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Performance of an ITER CS1 Model Coil Conductor Under Transverse Cyclic Loading up to 40,000 Cycles

Cited by 47 publications

References 11 publications

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of&lt;tex&gt;$hboxNb_3hboxSn$&lt;/tex&gt;Strands Tested in the Novel ‘TARSIS’ Setup

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of&lt;tex&gt;$hboxNb_3hboxSn$&lt;/tex&gt;Strands Tested in the Novel ‘TARSIS’ Setup

Comparisons of internal self-field magnetic flux densities between recent Nb3Sn fusion magnet CICC cable designs

Numerical investigation on transverse heat transfer properties in cross section of full size Nb3Sn CICC ITER conductor

Contact Info

Product

Resources

About

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of<tex>$hboxNb_3hboxSn$</tex>Strands Tested in the Novel ‘TARSIS’ Setup

Effect of Periodic Cyclic Deformation on the Voltage Current Transition of<tex>$hboxNb_3hboxSn$</tex>Strands Tested in the Novel ‘TARSIS’ Setup

Comparisons of internal self-field magnetic flux densities between recent Nb₃Sn fusion magnet CICC cable designs