A Monte Carlo study of photoelectron extraction efficiency from CsI photocathodes into XeCH4 and NeCH4 mixtures

J Escada (1) , T H V T Dias (1) , P.J.B.M. Rachinhas (1) , F P Santos (1) , J a M Lopes (1) , L C C Coelho (1) , C a N Conde (1) , a D Stauffer (2)

1 DFC - Departamento de Física [Coimbra]
2 Department of Physics and Astronomy [Toronto]

The extraction efficiency f for the photoelectrons emitted from a CsI photocathode into gaseous Xe-CH 4 and Ne-CH 4 mixtures is investigated by Monte Carlo simulation. The results are compared with earlier calculations in Ar-CH 4 mixtures and in the pure gases Xe, Ar, Ne and CH 4. The calculations examine the dependence of f on the density-reduced electric field E/N in the 0.1-40 Td range, on the incident photon energy E ph in the 6.8-9.8 eV (183-127 nm) VUV range and on the mixture composition. Results calculated for irradiation of the photocathode with a Hg(Ar) lamp are compared with experimental measurements for this lamp. To test the electron scattering cross-sections used in the simulations, electron drift parameters in Xe, Ne and their mixtures with CH 4 are also presented and compared with available experimental data.

Mots clés: 85.60.Gz; 51.10.+y; 29.40.Cs

J Escada, T H V T Dias, P.J.B.M. Rachinhas, F P Santos, J a M Lopes, et al.. A Monte Carlo study of photoelectron extraction efficiency from CsI photocathodes into XeCH4 and NeCH4 mixtures. Journal of Physics D: Applied Physics, 2010, 43 (6), pp.65502. ⟨10.1088/0022-3727/43/6/065502⟩. ⟨hal-00569761⟩