Mg-based photocathodes prepared by ns, ps and fs PLD for the production of high brightness electron beams

Miglietta, P.; Cultrera, L.; Cojanu, C.; Papadopoulou, Evie L.; Perrone, A.

doi:10.1016/j.apsusc.2008.07.131

Cited by 4 publications

(1 citation statement)

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“…Detailed studies were also carried out to deduce the influence of laser pulse duration on the thin film quality of Mg and Y. Morphological analyses performed by scanning electron microscopy (SEM) revealed that the density and mean size of droplets on Mg film surfaces decreases as the pulse laser duration diminishes [28]. Therefore sub-ps lasers should be used for this metal even if the ablation and deposition rates are quite small.…”

Section: Resultsmentioning

confidence: 99%

Highlights on photocathodes based on thin films prepared by pulsed laser deposition

Lorusso

Gontad

Perrone

et al. 2011

Phys. Rev. ST Accel. Beams

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We review the current status of metallic photocathodes based on thin films prepared by pulsed laser deposition (PLD) and we explore ways to improve the performance of these devices. PLD seems to be a very efficient and suitable technique for producing adherent and uniform thin films. Time-resolved mass spectrometric investigations definitively suggest that the deposition of high-purity metallic thin films should be carried out in ultrahigh vacuum systems and after a deep and careful laser cleaning of the target surface. Moreover, the laser cleaning of the target surface is highly recommended not only to remove the first contaminated layers but also to improve the quality of the vacuum by reducing the partial pressure of reactive chemical species as H 2 O, H 2 , and O 2 molecules. The challenge to realize high-purity Mg and Y thin films is very interesting for the photocathode R&D due to the good photoemission properties of these metals. Photocathodes based on Mg and Y thin films have been characterized by scanning electron microscopy and x-ray diffraction techniques to derive the morphological and structural features, respectively. They were also tested in a photodiode cell to deduce the photoelectron properties. The quantum efficiency of such photocathodes was systematically improved by in situ laser cleaning treatments of the surface in order to remove the contaminated layers reaching, in this way, the quantum efficiency of the corresponding bulk materials.

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Section: Resultsmentioning

confidence: 99%