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Pulsed laser deposition of yttrium photocathode suitable for use in radio-frequency guns

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Abstract

Yttrium (Y) thin film was grown by pulsed laser deposition (PLD) on a copper (Cu) polycrystalline substrate. Ex situ morphological and structural characterisations of the circular Y film of 1.2 µm thickness and 3 mm diameter have shown a very low droplet density on the film surface and a crystalline feature with a preferred orientation along the Y (100) plane. Moreover, Y thin film resulted in being very adherent to the Cu substrate and more scratch resistant than Cu bulk. A twin thin film was deposited also on a Cu backflange of a radio-frequency (RF) gun to test the suitability of the metallic thin film as photocathode. It was observed that the Y-coated photocathode was characterised by a quantum efficiency (QE) higher than that of the Cu bulk photocathode even if the presence of space charge effects didn’t allow deriving the absolute maximum value of QE of Y photocathode.

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Acknowledgements

This work was supported by the Italian National Institute of Nuclear Physics (INFN) and was partially funded by the Italian Ministry of Research in the framework of FIRB—Fondo per gli Investimenti della Ricerca di Base, Project no. RBFR12NK5K. We thank the technical support of Mr. D. Cannoletta for the XRD measurements. E. Broitman acknowledges financial support from the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO Mat LiU No 2009 00971).

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Authors and Affiliations

  1. Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento and Istituto Nazionale di Fisica Nucleare, 73100, Lecce, Italy

    A. Lorusso, F. Gontad & A. Perrone

  2. Elettra-Sincrotrone Trieste, in Area Science Park, 34149, Trieste, Italy

    M. Trovò, A. Demidovich & P. Cinquegrana

  3. IFM, Linköping University, 58183, Linköping, Sweden

    E. Broitman

  4. Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy

    E. Chiadroni

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  1. A. Lorusso
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  2. M. Trovò
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  3. A. Demidovich
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Correspondence to F. Gontad.

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Lorusso, A., Trovò, M., Demidovich, A. et al. Pulsed laser deposition of yttrium photocathode suitable for use in radio-frequency guns. Appl. Phys. A 123, 779 (2017). https://doi.org/10.1007/s00339-017-1396-1

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