EXPERIMENTAL STUDIES OF TRANSVERSE STRESS EFFECTS ON THE CRITICAL CURRENT OF SUB-SIZED NIOBIUM-TIN SUPERCONDUCTING CABLES

2010 ◽  
Author(s):  
L. Chiesa ◽  
M. Takayasu ◽  
J. V. Minervini ◽  
U. (Balu) Balachandran
Keyword(s):  
Critical Current ◽  
Experimental Studies ◽  
Transverse Stress ◽  
Stress Effects ◽  
Superconducting Cables

Experimental Studies of Transverse Stress Effects on the Critical Current of a Sub-Sized ${\rm Nb}_{3}{\rm Sn}$ Superconducting Cable

2007 ◽  
Vol 17 (2) ◽  
pp. 1386-1389 ◽  
Author(s):  
L. Chiesa ◽  
M. Takayasu ◽  
J. V. Minervini ◽  
C. Gung ◽  
P. C. Michael ◽  
...  
Keyword(s):  
Critical Current ◽  
Experimental Studies ◽  
Transverse Stress ◽  
Stress Effects

Transverse Compressive Stress Effects on the Critical Current of Bi-2223 Tapes

2007 ◽  
Vol 546-549 ◽  
pp. 1923-1926
Author(s):  
Cheng Shan Li ◽  
Eric Mossang ◽  
B. Bellin ◽  
Andre Sulpice ◽  
A. Antonevici ◽  
...  
Keyword(s):  
Critical Current ◽  
Compressive Stress ◽  
Cross Section ◽  
Tensile Strain ◽  
Transverse Stress ◽  
Stress Effects ◽  
Bending Strain ◽  
Section Size ◽  
Processing Defects ◽  
Irregular Interface

Bi-2223 tapes are usually subjected to tensile strain, bending strain and compressive stress in the process of fabrication and applications. In this study, we have measured the critical current of Bi-2223 tapes as a function of transverse compressive stress. The effects of the cross section size and processing defects on the stress characteristics of AgMn-alloy sheathed Bi-2223 tapes are compared. The experimental results showed that the onset transverse compressive stress for degradation of Ic was lower in the thinner tape with a thin Ag sheath due to the stress concentration on the irregular interface. The bubbled tapes were more sensitive to the transverse stress compared to the nonbubbled tapes.

Reversible Transverse Stress Effects on the Critical Current of an Internal Tin ${\rm Nb}_{3}{\rm Sn}$Strand Under Axial Strain

2010 ◽  
Vol 20 (3) ◽  
pp. 1451-1454 ◽  
Author(s):  
Sangjun Oh ◽  
Soo-Hyeon Park ◽  
Chulhee Lee ◽  
Heekyung Choi ◽  
Wonwoo Park ◽  
...  
Keyword(s):  
Critical Current ◽  
Axial Strain ◽  
Transverse Stress ◽  
Stress Effects

Critical-current degradation in Nb3Al wires due to axial and transverse stress

1993 ◽  
Vol 20 ◽  
pp. 271-275 ◽  
Author(s):  
T. Kuroda ◽  
H. Wada ◽  
S.L. Bray ◽  
J.W. Ekin
Keyword(s):  
Critical Current ◽  
Transverse Stress

Review of Stress Effects on Dopant Solubility in Silicon and Silicon-Germanium Layers

2009 ◽  
Vol 156-158 ◽  
pp. 173-180 ◽  
Author(s):  
Nicholas S. Bennett ◽  
Chihak Ahn ◽  
Nicholas E.B. Cowern ◽  
Peter Pichler
Keyword(s):  
Silicon Germanium ◽  
Experimental Studies ◽  
Close Correlation ◽  
Theoretical Treatment ◽  
Strained Si ◽  
Early Theory ◽  
Stress Effects ◽  
Experimental Findings ◽  
First Time ◽  
Strained Sige

We present a review of both theoretical and experimental studies of stress effects on the solubility of dopants in silicon and silicon-germanium materials. Critical errors and limitations in early theory are discussed, and a recent treatment incorporating charge carrier induced lattice strain and correct statistics is presented. Considering all contributing effects, the strain compensation energy is the primary contribution to solubility enhancement in both silicon and silicon-germanium for dopants of technological interest. An exception is the case of low-solubility dopants, where a Fermi level contribution is also found. Explicit calculations for a range of dopant impurities in Si are presented that agree closely with experimental findings for As, Sb and B in strained Si. The theoretical treatment is also applied to account for stress effects in strained SiGe structures, which also show close correlation with recently derived experimental results for B-doped strained SiGe which are presented here for the first time.

The transverse stress effect on the critical current of jelly-roll multifilamentary Nb/sub 3/Al wires

1991 ◽  
Vol 27 (2) ◽  
pp. 1829-1830 ◽  
Author(s):  
D. Zeritis ◽  
Y. Iwasa ◽  
T. Ando ◽  
Y. Takahashi ◽  
M. Nishi ◽  
...  
Keyword(s):  
Critical Current ◽  
Stress Effect ◽  
Transverse Stress ◽  
Jelly Roll

Critical current measurements on superconducting cables

1983 ◽  
Vol 19 (3) ◽  
pp. 720-723 ◽  
Author(s):  
M. Garber ◽  
W. Sampson ◽  
M. Tannenbaum
Keyword(s):  
Critical Current ◽  
Superconducting Cables

Recent R&D on Superconducting Wires for High-Field Magnet

2014 ◽  
Vol 783-786 ◽  
pp. 2081-2090 ◽  
Author(s):  
Xin Zhe Jin ◽  
Tatsushi Nakamoto ◽  
Kiyosumi Tsuchiya ◽  
Akira Yamamoto ◽  
Toru Ogitsu ◽  
...  
Keyword(s):  
Critical Current ◽  
High Field ◽  
Materials Science ◽  
Rapid Heating ◽  
High Temperature Superconductors ◽  
Experimental Studies ◽  
High Energy ◽  
Superconducting Wires ◽  
Neutron Diffractometer ◽  
High Field Magnet

Development for superconducting wires of materials such as Nb3Al and the high-temperature superconductors (HTS such as REBCO, Bi2223, and Bi2212) has been carried out for high-field magnet applications. It is known that these types of wire exhibit very different characteristics and performance for different applications. The development of Nb3Al wire for high-field accelerator magnet has resulted in remarkable achievements in critical current using a Rapid Heating and Quenching (RHQ) method by High Energy Accelerator Research Organization (KEK) and National Institute for Materials Science (NIMS). As one example of a characteristic of Nb3Al, the strain sensitivity of the critical current in the RHQ-Nb3Al wire is better than that of Nb3Sn wire. A strain study is needed to further the development of a high-filed magnet; therefore, we have carried out experimental studies using the neutron diffractometer at J-PARC Takumi. Researchers have recently achieved the highest critical current density for REBCO wires in a high-field above 15 T. For this reason, REBCO wire has been considered for high-field magnet NMR applications in Riken. But several obstacles remain, including coil degradation, shielding current and thermal runaway. In this paper, R&D on recent advances for applications will be presented.

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