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Nanomechanical and ...
Nanomechanical and electrical properties of Nb thin films deposited on Pb substrates by pulsed laser deposition as a new concept photocathode for superconductor cavities
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- Gontad, F (författare)
- University of Salento, Department of Mathematics and Physics
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- Lorusso, A (författare)
- University of Salento, Department of Mathematics and Physics
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- Panareo, M (författare)
- University of Salento, Department of Mathematics and Physics
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- Monteduro, A (författare)
- University of Salento, Department of Mathematics and Physics
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- Maruccio, G (författare)
- University of Salento, Department of Mathematics and Physics
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- Broitman, Esteban, 1958- (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Tunnfilmsfysik, Thin Film Physics
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- Perrone, A (författare)
- University of Salento, Department of Mathematics and Physics
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(creator_code:org_t)
- Elsevier BV, 2015
- 2015
- Engelska.
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Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 804, s. 132-136
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https://liu.diva-por... (primary) (Raw object)
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http://liu.diva-port...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
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