Optical transition radiation used in the diagnostic of low energy and low current electron beams in particle accelerators - Silva, Tiago Fiorini da; Bonini, Alfredo Luíz; Lima, Roberto da Rocha; Maidana, Nora Lia; Malafronte, Alexandre Almeida; Pascholati, Paulo Reginaldo; Vanin, Vito Roberto; Martins, Marcos Nogueira (Review of Scientific Instruments, 2012)