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

Paola Miglietta 1Luca Cultrera 2Alessio Perrone 1Camelia Cojanu 3Evie L. Papadopoulou 4

1. University of Lecce, Physics Department, Lecce 73100, Italy
2. °Laboratori Nazionali Frascati INFN (INFN), Via E. Fermi 40, Frascati 00044, Italy
3. National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Bucharest- Magurele 077125, Romania
4. IESL, FORTH, P.O. Box 1527, Vassilika Vouton, Heraklion 71110, Greece

Abstract

Mg-based photocathodes are attractive for the production of high brightness electron beams for future FELs, plasma acceleration experiments and high brillance linear colliders due to their respectable quantum efficiency.
The aim of this paper is to investigate the photoelectron performances and the surface morphology of Mg-based thin films prepared by pulsed laser deposition (PLD) using excimer lasers with different pulse duration: ns, ps and fs.
XeCl excimer laser (λ=308 nm) with pulse duration of 30 ns and KrF excimer laser (λ=248 nm) with 5 ps and 450 fs pulse duration were used for growing Mg films onto Si and Cu substrates in ultrahigh vacuum of 10-5 Pa at room temperature.
The photoelectron performances were tested in a DC photodiode cell. In order to increase the quantum efficiency, in situ laser cleaning treatments were applied to samples surface in order to remove oxidized or polluted layers.
Sacnning Electron Microscope (SEM) was used to characterize the morphology of the films deposited and the oxidation level of Mg was studied by Energy Dispersive X-Ray spectroscopy (EDX).
Comparison among Mg-based photocathodes prepared by ns, ps and fs PLD for the production of high brightness electron beams will be presented and discussed

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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium B, by Paola Miglietta
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-01-16 16:25
Revised:   2009-06-07 00:48
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