Test Results of the First US ITER TF Conductor in SULTAN

Martovetsky, N.; Hatfield, D.; Miller, J.R.; Gung, C.; Schultz, J.; Cheggour, Najib; Goodrich, Loren F.; Bruzzone, Pierluigi; Stepanov, B.; Wesche, R.; Seeber, B.

doi:10.1109/tasc.2009.2018204

Cited by 23 publications

(24 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We observed a "relaxation" on the strand in the high field region of the TFUS1 sample [16] using penetrating voltage taps that are installed on the same strand of the cable.…”

Section: Speculation About Tcs Growth Nature In the Selected Cs Condumentioning

confidence: 95%

“…There were a few conductors where Tcs saturation versus cycles was observed, like TFUS1 [16] after several hundred cycles. The most impressive is the saturation in the CS conductors with the short twist pitches [4][5][6].…”

Section: Observation Of the Broadness Of Transition Correlation With mentioning

confidence: 99%

“…If Tcs decreases slightly and To does not change significantly after short cycling history, like in USTF1 [16], it may mean that there is a some strain redistribution inside the cable that is not accompanied by the extended filament fracture. Obviously, this strain re-distribution is more favorable in the original condition than the one after the cycles.…”

Section: Speculation About Tcs Growth Nature In the Selected Cs Condumentioning

confidence: 99%

See 2 more Smart Citations

Correlation between degradation and broadness of the transition in CICC

Martovetsky¹

2013

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Cable in Conduit Conductor (CICC) performance is characterized in terms of relationships involving the electric field (E), voltage (V), temperature (T), current (I), magnetic field (B), and strain. Development of the electrical field in the V-T or V-I transitions in CICC is exponential, and in the coordinates log E vs T or log E vs I looks as a straight line.ITER Nb3Sn CICCs show degradation of properties versus load cycles that could be attributed to plastic deformation of the Nb3Sn strands or fracture of the superconducting filaments. The degradation is expressed in terms of reduction of the current sharing temperature Tcs or critical current Ic, respectively. It was noticed long ago that degradation is accompanied by a significant broadening of the V-T or V-I transition, that looks like a change in the slope in the semi-log coordinate plot. This paper presents some systematic observations of correlations between the critical parameters and broadness of the transition in many conductors tested in CICC. In most cases, the broadness of the transition seems to be a more sensitive indicator of the conductor damage even in cases when Tcs degradation is not clearly seen. Tcs degradation typically becomes obvious later in the cycling, especially after warm up and following cooldown and more cycling.In some cases, a CICC manifests temporary or even a permanent growth of Tcs with load cycles, especially in the latest measurements of the CS conductors with short twist pitches. A possible mechanism of degradation that allows qualitative explanation of this phenomenon is discussed, which is supported by the voltage measurements on the cable in TFUS1 with the voltage taps penetrating the jacket to the cable. IntroductionSince middle of 1990's, when an intensive development of the Nb3Sn CICC took place, a wealth of data on degradation of the high current Nb3Sn CICC has been developed. However, this knowledge has not yet produced a quantitative correlation that would allow predicting performance of the CICC from the properties of the strand, cabling pattern, void fraction and jacket properties and geometry.

show abstract

“…We observed a "relaxation" on the strand in the high field region of the TFUS1 sample [16] using penetrating voltage taps that are installed on the same strand of the cable.…”

Section: Speculation About Tcs Growth Nature In the Selected Cs Condumentioning

confidence: 95%

Section: Observation Of the Broadness Of Transition Correlation With mentioning

confidence: 99%

Section: Speculation About Tcs Growth Nature In the Selected Cs Condumentioning

confidence: 99%

See 1 more Smart Citation

Correlation between degradation and broadness of the transition in CICC

Martovetsky¹

2013

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…They are made from strands supplied by nine different companies in five DA's, four of them using bronze and the others "internal Sn" technique for the Nb 3 Sn strand assembly. More detail about the conductor layouts can be found in [10][11][12][13][14][15].…”

Section: Description Of the Iter Tf Prototype Conductorsmentioning

confidence: 99%

Qualification tests for ITER TF conductors in SULTAN

Bruzzone

Stepanov

Wesche

2009

Fusion Engineering and Design

Self Cite

View full text Add to dashboard Cite

“…The brittle nature of most of the technological superconductors, and the ever-increasing challenges that the mechanical forces on the conductor pose in large-scale and high magnetic-field applications, have made strain measurements so crucial for the development of these applications. An example of such demanding applications in terms of strain tolerance is the International Thermonuclear Experimental Reactor (ITER) currently under construction [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Strain and Magnetic-Field Characterization of a Bronze-Route ${\rm Nb}_{3}{\rm Sn}$ ITER Wire: Benchmarking of Strain Measurement Facilities at NIST and University of Twente

Cheggour

Nijhuis

Krooshoop

et al. 2012

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

A benchmarking experiment was conducted to compare strain measurement facilities at the National Institute of Standards and Technology (NIST) and the University of Twente. The critical current of a bronze-route wire, which was fabricated for the International Thermonuclear Experimental Reactor (ITER), was measured as a function of axial strain and magnetic field in liquid helium at both institutes. NIST used a Walters' spring strain device and University of Twente used a bending beam ("Pacman") apparatus. The ITER bronze-route wire investigated had a very high irreversible strain limit that allowed comparing data over a wide range of applied strain between 1% and 1%. Similarities of the data obtained by use of the two apparatuses were remarkable, despite the many differences in their design and techniques.

show abstract

Test Results of the First US ITER TF Conductor in SULTAN

Cited by 23 publications

References 8 publications

Correlation between degradation and broadness of the transition in CICC

Correlation between degradation and broadness of the transition in CICC

Qualification tests for ITER TF conductors in SULTAN

Strain and Magnetic-Field Characterization of a Bronze-Route ${\rm Nb}_{3}{\rm Sn}$ ITER Wire: Benchmarking of Strain Measurement Facilities at NIST and University of Twente

Contact Info

Product

Resources

About