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The new streak image tube PIF -01V.P.Degtyareva, Yu.V.Kulikov, M.A.Monastyrski, V.N.Platonov, V.E.Postovalov,A.M.Prokhorov, V.N.Ulasyuk, V.K.Ushakov, M.Ya.SchelevGeneral Physics Institute, USSR Academy of Sciences, 38 Vavilov street, 117942,Moscow, USSRAbstractA new, small -size image -converter tube type PIF -01 has been developed for recording ofvarious high speed phenomena with subpicosecond time resolution. The designing goal of thenew image- converter tube having four electrodes geometry (photocathode, acceleration mesh,focusing electrode, anode diaphragm) and incorporating with a modern deflection system, wasto simultaneously improve temporal resolution and dynamic range.Preliminary experimental re-sults confirm the efficiency of the software developed for pico- femtosecond streak tube com-putation and optimization.IntroductionFurther advance in femtosecond streak tube construction is tightly connected with theprogress in the following directions: 1. Creation of various computer models and mathemati-cal software for calculation of new electron -optical configurations having nonstationaryfield distribution. 2. Solving of some technological and metrological problems occured inphotocathodes manufacturing. 3. Adaptation of radiation sources emitting femtosecond pulsesin wide spectral range including infrared and X -ray bands. 4. Construction of read -out sys-tems featuring high sensitivity and large dynamic range.The subject of this paper is to investigate the practical approaches in simultaneousimprovement of streak tube temporal resolution and dynamic range. We introduce here a newtype PIF -01 four -electrodes, small -size streak tube having photocathode, accelerating assem-bly focusing electrode and anode diaphragm. The main technical performances of this tubesucn as temporal resolution along the input slit, temporal distortion and dynamic range havebeen evaluated theoretically. In the course of these estimations we assumed 0.3 eV FWHMinitial photoelectron energy distribution and cosinusoidal distribution for initial electronvelocities. The obtained results will be compared with the well known data for PV -001 streakimage tube. In conclusion some recommendation for designing of five electrodes PIF -02 streaktube will be mentioned.Description of PIF -01 streak tubeGeneral view of PIF -01 streak tube is shown in Figure 1, and its electron -optical geo-metry is presented in Figure 2. The electron -optical system of this tube consists of photo-