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427 results on '"Selvamanickam, V."'

1. Accelerator Magnet Development Based on COMB Technology with STAR Wires

Author

Kashikhin, V. V., Cohan, S., Lombardo, V., Turrioni, D., Mai, N., Chavda, A. K., Sambangi, U., Korupolu, S., Peram, J., Anil, A., Goel, C., Sandra, J. Sai, Yerraguravagari, V., Schmidt, R., Selvamanickam, V., Majkic, G., Galstyan, E., and Selvamanickam, K.

Subjects
Physics - Accelerator Physics
Abstract

This paper reports progress in the development of COMB magnet technology with STAR wires. A two-layer dipole magnet with 60 mm clear bore has been recently fabricated and tested in liquid nitrogen. The purpose of the test was to determine what kind of critical current degradation occurs in the process of winding the STAR wire into the COMB structure., Comment: CEC/ICMC23

Published
2023

2. Engineering current density over 5 kA mm-2 at 4.2 K, 14 T in thick film REBCO tapes

Author

Majkic, G, Pratap, R, Xu, A, Galstyan, E, Higley, HC, Prestemon, SO, Wang, X, Abraimov, D, Jaroszynski, J, and Selvamanickam, V

Subjects
HTS, YBCO, coated conductor, Condensed Matter Physics, Materials Engineering, Electrical and Electronic Engineering, General Physics
Abstract

We report on remarkably high in-field performance at 4.2 K achieved in >4 μm thick rare earth barium copper oxide (REBCO) samples with Zr addition. Two different samples have been measured independently at Lawrence Berkeley National Laboratory and the National High Magnetic Field Laboratory, achieving critical current densities (J c) of 12.21 MA cm-2 and 12.32 MA cm-2 at 4.2 K, 14 T (), respectively, which corresponds to equivalent critical current (I c) values of 2247 and 2119 A/4 mm. These I c values are about two times higher than the best reported performance of REBCO tapes to date and more than five times higher than the commercial HTS tapes reported in a recent study. The measured J c values, with a pinning force of ∼1.7 T N m-3 are almost identical to the highest value reported for thin (∼1 μm thick) REBCO at the field and temperature, but extended to very thick (>4 μm) films. This results in an engineering current density (J e) above 5 kA mm-2 at 4.2 K, 14 T, which is more than five times higher than Nb3Sn and nearly four times higher than the highest reported value of all superconductors other than REBCO at this field and temperature. The reported results have been achieved by utilizing an advanced metal organic chemical vapor deposition system. This study demonstrates the remarkable level of in-field performance achievable with REBCO conductors at 4.2 K and strong potential for high-field magnet applications.

Published
2018

5. Toward superconducting critical current by design

Author

Sadovskyy, I. A., Jia, Y., Leroux, M., Kwon, J., Hu, H., Fang, L., Chaparro, C., Zhu, S., Welp, U., Zuo, J. -M., Zhang, Y., Nakasaki, R., Selvamanickam, V., Crabtree, G. W., Koshelev, A. E., Glatz, A., and Kwok, W. -K.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

We present the new paradigm of critical current by design. Analogous to materials by design, it aims at predicting the optimal defect landscape in a superconductor for targeted applications by elucidating the vortex dynamics responsible for the bulk critical current. To highlight this approach, we demonstrate the synergistic combination of critical current measurements on commercial high-temperature superconductors containing self-assembled and irradiation tailored correlated defects by using large-scale time-dependent Ginzburg-Landau simulations for vortex dynamics., Comment: 12 pages, 6 figures; extended version

Published
2015
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8. Anisotropy of the irreversibility field for Zr-doped $(Y,Gd)Ba_2Cu_3O_{7-x}$ thin films up to 45T

Author

Tarantini, C., Jaroszynski, J., Kametani, F., Zuev, Y. L., Gurevich, A., Chen, Y., Selvamanickam, V., Larbalestier, D. C., and Christen, D. K.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science
Abstract

The anisotropic irreversibility field B$_{Irr}$ of two $YBa_2Cu_3O_{7-x}$ thin films doped with additional rare earth (RE)=(Gd,Y) and Zr and containing strong correlated pins (splayed BaZrO$_{3}$ nanorods, and $RE_2O_3$ nanoprecipitates), has been measured over a very broad range up to 45T at temperatures 56 K

Published
2012
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9. Properties of recent IBAD-MOCVD Coated Conductors relevant to their high field, low temperature magnet use

Author

Braccini, V, Xu, A, Jaroszynski, J, Xin, Y, Larbalestier, D C, Chen, Y, Carota, G, Dackow, J, Kesgin, I, Yao, Y, Guevara, A, Shi, T, and Selvamanickam, V

Subjects
Condensed Matter - Superconductivity
Abstract

BaZrO3 (BZO) nanorods are now incorporated into production IBAD-MOCVD coated conductors. Here we compare several examples of both BZO-free and BZO-containing coated conductors using critical current (Ic) characterizations at 4.2 K over their full angular range up to fields of 31 T. We find that BZO nanorods do not produce any c-axis distortion of the critical current density Jc(theta) curve at 4.2 K at any field, but also that pinning is nevertheless strongly enhanced compared to the non-BZO conductors. We also find that the tendency of the ab-plane Jc(theta) peak to become cusp-like is moderated by BZO and we define a new figure of merit that may be helpful for magnet design - the OADI (Off-Axis Double Ic), which clearly shows that BZO broadens the ab-plane peak and thus raises Jc 5-30{\deg} away from the tape plane, where the most critical approach to Ic occurs in many coil designs. We describe some experimental procedures that may make critical current Ic tests of these very high current tapes more tractable at 4.2 K, where Ic exceeds 1000 A even for 4 mm wide tape with only 1 micron thickness of superconductor. A positive conclusion is that BZO is very beneficial for the Jc characteristics at 4.2 K, just as it is at higher temperatures, where the correlated c-axis pinning effects of the nanorods are much more obvious.

Published
2010
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25. Analysis of quench initiation in YBCO coated conductors using optical interferometric techniques

Author

Angurel, L.A., Martinez, E., Lera, F., Recuero, S., Andres, N., Arroyo, M.P., Yi-Yuan Xie, and Selvamanickam, V.

Subjects
Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Copper oxide superconductors -- Electric properties, Copper oxide superconductors -- Magnetic properties, Electric fields -- Analysis, Interferometers -- Usage, Yttrium -- Electric properties, Yttrium -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Published
2009

26. Progress in high throughput processing of long-length, high quality, and low cost IBAD MgO buffer tapes at SuperPower

Author

Xuming Xiong, Sungjin Kim, Zdun, K., Sambandam, S., Rar, A., Lenseth, K.P., and Selvamanickam, V.

Subjects
Aluminum oxide -- Electric properties, Aluminum oxide -- Magnetic properties, Coating processes -- Analysis, Ion bombardment -- Usage, Magnesium oxide -- Electric properties, Magnesium oxide -- Magnetic properties, Yttrium -- Electric properties, Yttrium -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Published
2009

27. Properties of YBCO on LaMn[O.sub.3]-capped IBAD MgO-templates without homo-epitaxial MgO layer

Author

Polat, O., Aytug, T., Paranthaman, M., Kyunghoon Kim, Yifei Zhang, Cantoni, C., Zuev, Y.L., Goyal, A., Thompson, J.R., Christen, D.K., Xuming Xiong, and Selvamanickam, V.

Subjects
Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Copper oxide superconductors -- Electric properties, Copper oxide superconductors -- Magnetic properties, Lanthanum -- Electric properties, Lanthanum -- Magnetic properties, Magnesium oxide -- Electric properties, Magnesium oxide -- Magnetic properties, Manganese -- Electric properties, Manganese -- Magnetic properties, Yttrium -- Electric properties, Yttrium -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Published
2009

28. High performance 2G wires: from R&D to pilot-scale manufacturing

Author

Selvamanickam, V., Yimin Chen, Xuming Xiong, Xie, Y.Y., Martchevski, M., Rar, A., Yunfei Qiao, Schmidt, R.M., Knoll, A., Lenseth, K.P., and Weber, C.S.

Subjects
Chemical vapor deposition -- Usage, Copper oxide superconductors -- Electric properties, Copper oxide superconductors -- Magnetic properties, Electrical wire -- Composition, Electrical wire -- Design and construction, Yttrium -- Electric properties, Yttrium -- Magnetic properties, Zirconium -- Electric properties, Zirconium -- Magnetic properties, Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Published
2009

29. Effect of Mn addition on in-field behavior of IBAD/MOCVD Gd-YBCO second generation HTS tapes

Author

Mensah, R.J., Majkic, G., Yimin Chen, Selvamanickam, V., Putman, P., and Salama, K.

Subjects
Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Chemical vapor deposition -- Usage, High temperature superconductors -- Electric properties, High temperature superconductors -- Magnetic properties, Manganese -- Electric properties, Semiconductor doping -- Analysis, Business, Electronics, Electronics and electrical industries
Published
2009

30. Characterization of long-length, MOCVD-derived REBCO coated conductors

Author

Miller, D.J., Maroni, V.A., Hiller, J.M., Koritala, R.E., Yimin Chen, Black, J.L.R., and Selvamanickam, V.

Subjects
Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Chemical vapor deposition -- Usage, Copper oxide superconductors -- Electric properties, Copper oxide superconductors -- Magnetic properties, Raman spectroscopy -- Usage, Rare earth metals -- Magnetic properties, Rare earth metals -- Electric properties, Business, Electronics, Electronics and electrical industries
Published
2009

31. AC losses and magnetic coupling in multifilamentary 2G HTS conductors and tape arrays

Author

Marchevsky, M., Ed Zhang, Yiyuan Xie, Selvamanickam, V., and Ganesan, P.G.

Subjects
Electric currents -- Measurement, High temperature superconductors -- Electric properties, High temperature superconductors -- Magnetic properties, Magnetization -- Analysis, Superconducting magnets -- Design and construction, Business, Electronics, Electronics and electrical industries
Published
2009

32. Second-generation HTS conductor design and engineering for electrical power applications

Author

Yi-Yuan Xie, Marchevsky, M., Xun Zhang, Lenseth, K., Yimin Chen, Xuming Xiong, Yunfei Qiao, Rar, A., Gogia, B., Schmidt, R., Knoll, A., Selvamanickam, V., Pethuraja, G.G., and Dutta, P.

Subjects
Superconducting magnets -- Usage, Alternating current -- Measurement, Electric power systems -- Design and construction, High temperature superconductors -- Design and construction, Business, Electronics, Electronics and electrical industries
Published
2009

33. Recent developments in 2G HTS coil technology

Author

Hazelton, D.W., Selvamanickam, V., Duval, J.M., Larbalestier, D.C., Markiewicz, W.D., Weijers, H.W., and Holtz, R.L.

Subjects
Electric coils -- Design and construction, Electric coils -- Mechanical properties, High temperature superconductors -- Usage, Magnetic fields -- Analysis, Business, Electronics, Electronics and electrical industries
Published
2009

35. Strain analysis of [I.sub.c]([epsilon]) characteristic of YBCO coated conductor measured by a Walters spring

Author

Sugano, M., Choi, S., Miyazoe, A., Miyamatsu, K., Ando, T., Itoh, K., Kiyoshi, T., Wada, H., and Selvamanickam, V.

Subjects
Electric currents -- Measurement, Superconductors -- Evaluation, Business, Electronics, Electronics and electrical industries
Abstract

Critical current ([I.sub.c])-strain characteristic of YBCO coated conductor is measured by using a Walters spring (WASP). The results have shown that combined strain of bending and tensile strains are regarded as simple summation in the present YBCO coated conductor.

Published
2008

38. Second generation high-temperature superconducting wires for fault current limiter applications

Author

Xie, Y.Y., Tekletsadik, K., Hazelton, D., and Selvamanickam, V.

Subjects
High temperature superconductors -- Usage, High temperature superconductors -- Electric properties, Electric fault location -- Methods, Electrical wire -- Electric properties, Business, Electronics, Electronics and electrical industries
Abstract

The evaluation of second-generation (2G) High Temperature Superconducting (HTS) wires for fault current limiter (FCL) applications is discussed. Results suggest that the 2G HTS conductor was successful in limiting the fault current to 32 kA at the first peak with 3.2 kA in the HTS elements.

Published
2007

39. Recent progress in second-generation HTS conductor scale-up at superpower

Author

Selvamanickam, V., Y. Chen, X. Xiong, Y.Y. Xie, Reeves, J.L., Zhang, X., Y. Qiao, Lenseth, K.P., Schmidt, R.M., Rar, A., and Hazelton, D.W.

Subjects
High temperature superconductors -- Electric properties, Electric coils -- Analysis, Thick films -- Electric properties, Business, Electronics, Electronics and electrical industries
Abstract

Various advancements have been made in the development of [YBa.sub.2][Cu.sub.3][O.sub.x] (YBCO) second generation HTS conductor scale-up at superpower. These conductors are found to exhibit very high values of the critical current.

Published
2007

43. Texture development and superconducting properties of YBCO thick films deposited on buffered metal substrates at various deposition rates

Author

Yijie Li, K. Zdun, L. Hope, J. Xie, Corcoran, S., Qiao, Y., Reeves, J., Lenseth, K., and Selvamanickam, V.

Subjects
Microstructure -- Analysis, Thick films -- Research, Superconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Reporting the investigation on the texture development and superconducting properties of YBCO films deposited on buffered metal substrates during our scale-up process is presented. The results demonstrate that high quality YBCO thick films with high critical current carrying ability is fabricated by PLD at very high deposition rate on buffered metal substrates.

Published
2003

46. Advances in fabrication of Ag-clad Bi-2223 superconductors

Author

Balachandran, U., Lelovic, M., Prorok, B.C., Eror, N.G., Selvamanickam, V., and Haldar, P.

Subjects
High temperature superconductivity -- Research, High temperature superconductors -- Research, Metallic films -- Research, Thin films -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The powder-in-tube technique was used to fabricate multifilamentary silver-clad Bi-2223 tapes with the precursor powder containing Pb-added 2212, Ca2PbO4, alkaline-earth cuprate and CuO phases and having the overall stoichiometry of Bi-2223. Varying the mechanical and thermal processes during tape processing improved the transport current properties in these multifilament silver-clad Bi-2223 superconducting tapes. Experimental methods and findings are presented.

Published
1999

47. Y-Ba-Cu-O film deposition by metal organic chemical vapor deposition on buffered metal substrates

Author

Selvamanickam, V., Galinski, G., DeFrank, J., Trautwein, C., Haldar, P., Balachandran, U., Lanagan, M., and Chudzik, M.

Subjects
Semiconductor films -- Research, Superconductors -- Research, Thin films -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Metal Organic Chemical Vapor Deposition (MOCVD) was used to deposit YBa2Cu3Ox (YBCO) films on buffered metal substrates. A thermonuclear process was used to fabricate cube-textured nickel substrates. Thermal evaporation was then used to deposit epitaxial CeO2 films on these substrates. MOCVD was also used to deposit highly biaxially-textured YBCO films on both types of metal substrates. The results showed that a critical current density greater than 10 to the fifth power A/cm2 at 77 K has been achieved in YBCO films on metal substrates.

Published
1999

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