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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Experimental Evidence for Electric Surface Resistance in Niobium
AU - Junginger, Tobias
AU - Aull, Sarah
AU - Weingarten, Wolfgang
AU - Welsch, Carsten Peter
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Identifying the loss mechanisms of niobium cavities enables an accurate determination of applications for future accelerator projects and points to research topics required to mitigate current limitations. For several cavities an increasing surface resistance above a threshold field, saturating at higher field has been observed. Measurements on samples give evidence that this effect is caused by the surface electric field. The measured temperature and frequency dependence is consistent with a model that accounts for these losses by interface tunnel exchange between localized states in dielectric oxides and the adjacent superconductor.
AB - Identifying the loss mechanisms of niobium cavities enables an accurate determination of applications for future accelerator projects and points to research topics required to mitigate current limitations. For several cavities an increasing surface resistance above a threshold field, saturating at higher field has been observed. Measurements on samples give evidence that this effect is caused by the surface electric field. The measured temperature and frequency dependence is consistent with a model that accounts for these losses by interface tunnel exchange between localized states in dielectric oxides and the adjacent superconductor.
KW - Accelerator cavities
KW - niobium
KW - superconducting accelerator cavities
KW - superconducting cavity resonators
KW - superconducting films
KW - superconducting materials measurements
KW - surface impedance
U2 - 10.1109/TASC.2017.2739646
DO - 10.1109/TASC.2017.2739646
M3 - Journal article
AN - SCOPUS:85028516944
VL - 27
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 7
M1 - 8012531
ER -