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The effect of vacancies on the microwave surface resistance of niobium revealed by positron annihilation spectroscopy
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10.1063/1.4811090
/content/aip/journal/apl/102/23/10.1063/1.4811090
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/23/10.1063/1.4811090

Figures

Image of FIG. 1.
FIG. 1.

(a) Results of measurements on fine grain electropolished cavities before and after mild baking; (b) individual for samples 1-EP and 3-EP-MB; (c) temperature mapping boards attached to the outside cavity walls; three boards are removed for demonstration purposes; (d) single individual board with sensor numbering; (e) schematic showing how angle is measured around the rotational cavity axis; 36 boards are uniformly spaced with 10° separation; (f) local magnetic field at sensor locations and unfolded temperature maps of for unbaked and baked fine grain electropolished cavities at .

Image of FIG. 2.
FIG. 2.

(a) () for samples 6-BCP and 7-BCP-MB from the large grain BCP cavity, and fine grain cavity samples 4-BCP and 5-BCP-MB, which had additional BCP 50 m after they were cut out; (b) S-W plot for the same samples.

Image of FIG. 3.
FIG. 3.

() for fine grain electropolished samples before (1-EP, 2-EP), and after (1-EP-MB, 2-EP-MB, 3-EP-MB) mild baking at 120 °C vacuum bake for 48 h. Inset shows the change in () shape at low energies.

Tables

Generic image for table
Table I.

List of cutout samples investigated with VEPAS (EP, electropolishing; BCP, buffered chemical polishing; MB = mild baking − vacuum bake at 120 °C for 48 h).

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/content/aip/journal/apl/102/23/10.1063/1.4811090
2013-06-11
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The effect of vacancies on the microwave surface resistance of niobium revealed by positron annihilation spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/23/10.1063/1.4811090
10.1063/1.4811090
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