Abstract
We have irradiated a double pancake coil of Bi-2223/Ag sheathed tape with high energy protons, which yield splayed columnar defects in the superconductor core of the tape. We report the critical current I{sub c} and current-voltage power law n value as a function of magnetic field at temperatures of 75-64 K for the coil and for a short sample taken from the coil. A novel apparatus using permanent magnets is used to apply a magnetic field in the coil radial direction. Both the coil and short sample show a strong enhancement in I{sub c} for magnetic fields along the c axis (tape normal or radial direction for the coil) compared to the performance of unirradiated tape. These results represent the first time a real superconducting device has been irradiated with high energy protons for the purpose of introducing splayed columnar defects to enhance performance.
Citation Formats
Coulter, J Y, Willis, J O, Maley, M P, and Ullmann, J L.
Improved critical currents in a Bi-2223/Ag coil using splayed columnar defects.
Netherlands: N. p.,
2004.
Web.
doi:10.1016/j.physc.2004.01.115.
Coulter, J Y, Willis, J O, Maley, M P, & Ullmann, J L.
Improved critical currents in a Bi-2223/Ag coil using splayed columnar defects.
Netherlands.
https://doi.org/10.1016/j.physc.2004.01.115
Coulter, J Y, Willis, J O, Maley, M P, and Ullmann, J L.
2004.
"Improved critical currents in a Bi-2223/Ag coil using splayed columnar defects."
Netherlands.
https://doi.org/10.1016/j.physc.2004.01.115.
@misc{etde_20618509,
title = {Improved critical currents in a Bi-2223/Ag coil using splayed columnar defects}
author = {Coulter, J Y, Willis, J O, Maley, M P, and Ullmann, J L}
abstractNote = {We have irradiated a double pancake coil of Bi-2223/Ag sheathed tape with high energy protons, which yield splayed columnar defects in the superconductor core of the tape. We report the critical current I{sub c} and current-voltage power law n value as a function of magnetic field at temperatures of 75-64 K for the coil and for a short sample taken from the coil. A novel apparatus using permanent magnets is used to apply a magnetic field in the coil radial direction. Both the coil and short sample show a strong enhancement in I{sub c} for magnetic fields along the c axis (tape normal or radial direction for the coil) compared to the performance of unirradiated tape. These results represent the first time a real superconducting device has been irradiated with high energy protons for the purpose of introducing splayed columnar defects to enhance performance.}
doi = {10.1016/j.physc.2004.01.115}
journal = []
issue = {1-2}
volume = {412-414}
journal type = {AC}
place = {Netherlands}
year = {2004}
month = {Oct}
}
title = {Improved critical currents in a Bi-2223/Ag coil using splayed columnar defects}
author = {Coulter, J Y, Willis, J O, Maley, M P, and Ullmann, J L}
abstractNote = {We have irradiated a double pancake coil of Bi-2223/Ag sheathed tape with high energy protons, which yield splayed columnar defects in the superconductor core of the tape. We report the critical current I{sub c} and current-voltage power law n value as a function of magnetic field at temperatures of 75-64 K for the coil and for a short sample taken from the coil. A novel apparatus using permanent magnets is used to apply a magnetic field in the coil radial direction. Both the coil and short sample show a strong enhancement in I{sub c} for magnetic fields along the c axis (tape normal or radial direction for the coil) compared to the performance of unirradiated tape. These results represent the first time a real superconducting device has been irradiated with high energy protons for the purpose of introducing splayed columnar defects to enhance performance.}
doi = {10.1016/j.physc.2004.01.115}
journal = []
issue = {1-2}
volume = {412-414}
journal type = {AC}
place = {Netherlands}
year = {2004}
month = {Oct}
}