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Nanomechanical and electrical properties of Nb thin films deposited on Pb substrates by pulsed laser deposition as a new concept photocathode for superconductor cavities
University of Salento, Department of Mathematics and Physics.
University of Salento, Department of Mathematics and Physics.
University of Salento, Department of Mathematics and Physics.
University of Salento, Department of Mathematics and Physics.
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2015 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 804, 132-136 p.Article in journal (Refereed) Published
Abstract [en]

We report a design of photocathode, which combines the good photoemissive properties of lead (Pb) and the advantages of superconducting performance of niobium (Nb) when installed into a superconducting radio-frequency gun. The new configuration is obtained by a coating of Nb thin film grown on a disk of Pb via pulsed laser deposition. The central emitting area of Pb is masked by a shield to avoid the Nb deposition. The nanomechanical properties of the Nb film, obtained through nanoindentation measurements, reveal a hardness of 2.8±0.3 GPa, while the study of the electrical resistivity of the film shows the appearance of the superconducting transitions at 9.3 K and 7.3 K for Nb and Pb, respectively, very close to the bulk material values. Additionally, morphological, structural and contamination studies of Nb thin film expose a very low droplet density on the substrate surface, a small polycrystalline orientation of the films and a low contamination level. These results, together with the acceptable Pb quantum efficiency of 2×10−5 found at 266 nm, demonstrate the potentiality of the new concept photocathode.

Place, publisher, year, edition, pages
2015. Vol. 804, 132-136 p.
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-122032DOI: 10.1016/j.nima.2015.09.064ISI: 000364133700018OAI: oai:DiVA.org:liu-122032DiVA: diva2:861469
Note

Funding agencies: Italian National Institute of Nuclear Physics (INFN); Italian MIUR through the Project FIRB Futuro in Ricerca [RBFR12NK5K]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]

Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2016-09-28Bibliographically approved

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Broitman, Esteban
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Thin Film PhysicsFaculty of Science & Engineering
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Inorganic Chemistry

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