TY - GEN
T1 - Waveform of loss voltage in Ag-sheathed Bi2223 superconducting tape carrying AC transport current
AU - Nguyen, Doan N.
AU - Sastry, Pamidi V.P.S.S.
AU - Schwartz, Justin
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/3/31
Y1 - 2006/3/31
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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U2 - 10.1063/1.2192435
DO - 10.1063/1.2192435
M3 - Conference contribution
AN - SCOPUS:33845457680
SN - 0735403163
SN - 9780735403161
T3 - AIP Conference Proceedings
SP - 869
EP - 876
BT - ADVANCES IN CRYOGENIC ENGINEERING
T2 - ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC
Y2 - 29 August 2005 through 2 September 2005
ER -