The effect of vacancies on the microwave surface resistance of niobium revealed by positron annihilation spectroscopy
Using variable-energy positron annihilation spectroscopy, we demonstrate that a different near-surface vacancy concentration accompanies drastic differences in surface resistance of superconducting niobium cavities for particle acceleration. Our data suggest that vacuum baking at 120 °C leads to the...
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| Veröffentlicht in: | Applied physics letters 2013-06, Vol.102 (23) |
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| container_title | Applied physics letters |
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| creator | Romanenko, A. Edwardson, C. J. Coleman, P. G. Simpson, P. J. |
| description | Using variable-energy positron annihilation spectroscopy, we demonstrate that a different near-surface vacancy concentration accompanies drastic differences in surface resistance of superconducting niobium cavities for particle acceleration. Our data suggest that vacuum baking at 120 °C leads to the doping of a near-surface layer with vacancy-hydrogen complexes, and that higher vacancy-type defect concentration distinguishes electropolished from chemically etched cavities. Our findings may help to explain a strong dependence of cavity performance on heat and chemical treatments, and may be of interest to other physics fields including cavity quantum electrodynamics (QED), microresonators, and single photon detectors. |
| doi_str_mv | 10.1063/1.4811090 |
| format | Article |
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| ispartof | Applied physics letters, 2013-06, Vol.102 (23) |
| issn | 0003-6951 1077-3118 |
| language | eng |
| recordid | cdi_crossref_primary_10_1063_1_4811090 |
| source | AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection |
| title | The effect of vacancies on the microwave surface resistance of niobium revealed by positron annihilation spectroscopy |
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