[en] The time resolution capabilities of prototype microchannel plate and static crossed-field photomultipliers have been investigated. Measurements were made of electron transit time, rise time, time response, single phtoelectron time spread and multiphotoelectron time spread for LEP HR350 proximity focused high gain curved microchannel plate and VPM-154A/1.6L static crossed-field photomultipliers. The experimental data have been compared with results obtained with conventionally designed high speed photomultipliers. Descriptions are given of both the measuring techniques and the measuring systems. 16 refs

[en] The multiple-time nature of quantum systems becomes most apparent when a particle is subjected to multiple-time measurements - measurements that involve the sum (or difference, product, and so on) of the value of one observable associated with the system at one time and the value of another observable associated with the system at a different time. Many surprising regularities emerge when such measurements are performed. For example, under certain circumstances, the behavior of a system within a given interval is completely determined by the outcome of multiple-time measurements (specially, two-time measurements) conducted at the boundaries of the interval; it is completely independent of the outcome of any single-time measurements (such as measurements to determine the state of the system) conducted before or after the interval. This result and many others indicate that quantum systems subjected to multiple time measurements behave as though they are in multiple-time states that are eigenstates of so-called multiple-time operators

[en] The ARGO-YBJ experiment is a full-coverage array of Resistive Plate Chambers (RPCs) covering a surface of 74 × 78 m² surrounded by a guard ring. It has been running almost uninterruptedly with its complete layout since November 2007. However, the work to optimize the stability of the experimental setup is still going on. The recorded daily and seasonal changes of temperature and barometric pressure affect the behaviour of the detector, in particular the time resolution and somehow the efficiency. Here a procedure is described for the equalization and the stabilization of the detector response.

No abstract available

[en] A theoretical study shows that it is possible to produce a drum rotating at a peripheral speed of 500m/s. A prototype has actually reached this speed and confirmed the feasibility of the system. It is driven by an electric motor and is made of titanium covered with boron fibres. The main performances to be expected of cameras (whole-image, slit or spectrographic) using such a drum is described

[en] Time resolution of 32 specimens of the photomultiplier FEhU-36 was measured. 4 specimens had the best approximately 200 ps resolution. The method of resolution measurement is described. It is shown that the FEhU-36 application in precision timing spectrometers of 300-400 ps resolution is possible at their precise selection

[en] Fluctuations of signal propagation time (jitter) for the FEU-36 and the FEU-37 (95 and 37 samples, respectively) are measured by recording spectrum of photomultiplier signal lag from eight emitting diode. Total jitter estimates for the FEU-36 are approximation to zero amplitude of a pulse, actuating LED. Possibility of obtaining better time resolutions increases with photocathode sensitivity growth. Selection of the FEU-36 ensures reproducible time resolution of position lifetime spectrometers at about 250-300 ps under routine experimental conditions

[en] The time resolution capabilities of prototype microchannel plate and static crossed-field high gain photon detectors have been investigated. The devices studied included the LEP HR350 and PM 137-proximity focused high gain microchannel plate and VPM-154A/1.6L static crossed-field photomultipliers. Measurements were made of electron transit time, rise time, time resonse, single photoelectron time spread and multiphotoelectron time spread. The experimental data have been compared with results obtained with conventionally designed RCA 8850 and C31024 high speed photomultipliers. Descriptions are given of the measuring techniques

[en] A systematic investigation to obtain good time resolutions with proper shape of the resolution curve in fast-slow coincidence systems is described. Measuring the output time-walk as a function of the input signal amplitude for fast timing discriminators, it was possible to choose an input signal amplitude range resulting in small time uncertainty and thus to achieve a good time resolution almost independent of the dynamic range. With an additional fast gating line a more gaussian shape of the resolution curve with less pronounced tails on both sides could be obtained

[en] The facility for measuring the time spread in the PMT single-electron pulses is described. Cherenkov radiation induced by electrons in a radiator is detected by two PMTs, one of which generates a trigger and the other one is tested and operates in the Cherenkov single-electron mode