Author Index: A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z

Pedersoli, E.

Paper Title Page
THPP046 Monte Carlo Transverse Emittance Study on Cs2Te 572
 
  • F. Banfi, G. Ferrini, P.G. Galimberti, C. Giannetti, S. Pagliara, F. Parmigiani, E. Pedersoli
    Universita Cattolica-Brescia, Brescia
  • J.N. Corlett, S.M. Lidia
    LBNL, Berkeley, California
  • B. Ressel
    ELETTRA, Basovizza, Trieste
  
 

Funding: U.S. DOE, Office of Science, under Contract No. DE-AC03-76SF00098

A Monte Carlo study of electron transport in Cs2Te films is performed to investigate the transverse emittance epsilon at the cathode surface. We find the photoemitted electron angular distribution and explain the physical mechanism involved in the process, a mechanism hindered by the statistical nature of the Monte Carlo method. The effects of electron-phonon scattering are discussed. The transverse emittance is calculated for different radiation wavelengths and a laser spot size of 1.5*10(-3) m. For a laser radiation at 265 nm we find epsilon = 0.56 mm-mrad. The dependence of epsilon and the quantum yield on the electron affinity Ea is also investigated. The data shows the importance of aging/contamination on the material.

  
   
THPP047 Quantum Efficiency Measurements of Femtosecond Vectorial Photoemission on Cu Photocathodes
 
  • F. Banfi, G. Ferrini, P.G. Galimberti, C. Giannetti, S. Pagliara, F. Parmigiani, E. Pedersoli
    Universita Cattolica-Brescia, Brescia
  • J.N. Corlett, S.M. Lidia
    LBNL, Berkeley, California
  • B. Ressel
    ELETTRA, Basovizza, Trieste
  
 

Funding: U.S Department of Energy, Office of Science under Contract No. DE-AC03-76SF00098.

Quantum Efficiency (QE) measurements of single photon photoemission from a Cu(111) single crystal and a Cu polycrystal photocathodes, irradiated by 150~fs-6.28~eV laser pulses, are reported over a broad range of incidence angle in both s and p polarizations. The maximum value of QE for the Cu polycrystal sample is Y~4*10(-4), obtained with p polarization at an angle of incidence theta=65°. Our data confirm the vectorial photoemission model. Issues concerning surface roughness and symmetry considerations are addressed. An explanation in terms of non local conductivity tensor is proposed. Advantages of a 6.28~eV photon as compared to the standard 4.71~eV photon in use with Cu photocathodes are discussed.