Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current

Doan N. Nguyen; Pamidi V.P.S.S. Sastry; Justin Schwartz

doi:10.1063/1.2192435

Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current

Doan N. Nguyen, Pamidi V.P.S.S. Sastry, Justin Schwartz

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In AC loss measurements of superconductors using the four-terminal method, the voltage measured consists of two components. The loss voltage component is in phase with transport current while the inductive voltage is out of phase with transport current. Here we report on the use of a compensation coil to nearly cancel the inductive voltage. The loss voltage was amplified by a transformer amplifier and observed on a digital oscilloscope. The waveform of the measured voltage was compared with that of a calculated signal. The loss voltage was analytically calculated for a round wire using the critical state model. The effects of frequency on the waveform of the loss voltage are also studied. Finally, a comparison between waveforms of loss voltages obtained with sine-wave and triangle-wave transport currents are presented.

Original language	English (US)
Title of host publication	ADVANCES IN CRYOGENIC ENGINEERING
Subtitle of host publication	Transactions of the International Cryogenic Materials Conference, ICMC, Volume 52B
Pages	869-876
Number of pages	8
DOIs	https://doi.org/10.1063/1.2192435
State	Published - Mar 31 2006
Event	ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC - Keystone, CO, United States Duration: Aug 29 2005 → Sep 2 2005

Publication series

Name	AIP Conference Proceedings
Volume	824 II
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC
Country/Territory	United States
City	Keystone, CO
Period	8/29/05 → 9/2/05

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

10.1063/1.2192435

Cite this

Nguyen, D. N., Sastry, P. V. P. S. S., & Schwartz, J. (2006). Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current. In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC, Volume 52B (pp. 869-876). (AIP Conference Proceedings; Vol. 824 II). https://doi.org/10.1063/1.2192435

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title = "Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current",

abstract = "In AC loss measurements of superconductors using the four-terminal method, the voltage measured consists of two components. The loss voltage component is in phase with transport current while the inductive voltage is out of phase with transport current. Here we report on the use of a compensation coil to nearly cancel the inductive voltage. The loss voltage was amplified by a transformer amplifier and observed on a digital oscilloscope. The waveform of the measured voltage was compared with that of a calculated signal. The loss voltage was analytically calculated for a round wire using the critical state model. The effects of frequency on the waveform of the loss voltage are also studied. Finally, a comparison between waveforms of loss voltages obtained with sine-wave and triangle-wave transport currents are presented.",

author = "Nguyen, {Doan N.} and Sastry, {Pamidi V.P.S.S.} and Justin Schwartz",

note = "Copyright: Copyright 2008 Elsevier B.V., All rights reserved.; ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC ; Conference date: 29-08-2005 Through 02-09-2005",

year = "2006",

month = mar,

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Nguyen, DN, Sastry, PVPSS & Schwartz, J 2006, Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current. in ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC, Volume 52B. AIP Conference Proceedings, vol. 824 II, pp. 869-876, ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC, Keystone, CO, United States, 8/29/05. https://doi.org/10.1063/1.2192435

Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current. / Nguyen, Doan N.; Sastry, Pamidi V.P.S.S.; Schwartz, Justin.
ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC, Volume 52B. 2006. p. 869-876 (AIP Conference Proceedings; Vol. 824 II).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - In AC loss measurements of superconductors using the four-terminal method, the voltage measured consists of two components. The loss voltage component is in phase with transport current while the inductive voltage is out of phase with transport current. Here we report on the use of a compensation coil to nearly cancel the inductive voltage. The loss voltage was amplified by a transformer amplifier and observed on a digital oscilloscope. The waveform of the measured voltage was compared with that of a calculated signal. The loss voltage was analytically calculated for a round wire using the critical state model. The effects of frequency on the waveform of the loss voltage are also studied. Finally, a comparison between waveforms of loss voltages obtained with sine-wave and triangle-wave transport currents are presented.

AB - In AC loss measurements of superconductors using the four-terminal method, the voltage measured consists of two components. The loss voltage component is in phase with transport current while the inductive voltage is out of phase with transport current. Here we report on the use of a compensation coil to nearly cancel the inductive voltage. The loss voltage was amplified by a transformer amplifier and observed on a digital oscilloscope. The waveform of the measured voltage was compared with that of a calculated signal. The loss voltage was analytically calculated for a round wire using the critical state model. The effects of frequency on the waveform of the loss voltage are also studied. Finally, a comparison between waveforms of loss voltages obtained with sine-wave and triangle-wave transport currents are presented.

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Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current

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