Publication Details:

Established in 2008

Journal or Publication Title:

Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես

ISSN:

1829-1171

Official URL:

Coverage:

113-123

Abstract:

Experimental investigations of photoelectron emission from a multialkali photocathode in the 400–700 nm wavelength range were performed using a prototype Radio Frequency Photomultiplier Tube (RFPMT) manufactured by Photek Ltd. Measurements of the spatial distributions of photoelectrons revealed a pronounced wavelength dependence, with the transverse spreading of emitted electrons decreasing significantly toward the red spectral regions. The experimental results were reproduced using simulations performed with the SIMION software package. By comparing the simulated and measured distributions, the maximum photoelectron emission energies were determined as a function of photon wavelength. The obtained results demonstrate that the maximum photoelectron energies are substantially smaller than expected from a simple excess energy photoemission model and for red photons does not exceed ∼0.1 eV. Based on the experimentally determined emission parameters, the timing performance of RFPMTs with different geometries was evaluated by using SIMION software package. The results obtained show that with the help of the RFPMT prototype, it will be possible to record photons of 400-700 nm with a temporal resolution of several ps. It was also demonstrated that simplified, compact RFPMT configurations can achieve single photon timing resolution below 15 ps, while optimized detector geometries may approach the sub-10 picosecond regime for red photons.

Format:

pdf

Identifier:

oai:arar.sci.am:439304

Location of original object:

ՀՀ ԳԱԱ Հիմնարար գիտական գրադարան