[en] Three sets of experiments carried out at different times and in different laboratories on measuring the material parameter for uranium-graphite lattices using natural and slightly enriched uranium are analyzed. Comparison with the calculations by the TRIFOGR and MCU (the Monte Carlo method) codes reveals resonable agreement between the calculation and experiment (of the order of 0.4% in K_eff). 17 refs.; 3 tabs

[en] The experience in designing the system for preliminary events selection for experiments on the SIGMA and GAMS spectrometers has been generalized. A unit-structure of the system allows one to use it efficiently in different experiments. Some real examples are given to illustrate the operation of the main units of the system. Some of the most typical circuit solutions are given. The main principle,he system based on, is synchronization of counter signals and strob-pulse, their state storage in triggers and subsequent analysis to take a decision on the event recording. To eliminate time synchronization the system in intermediate points is built according to the pulse-potential scheme. Natural is subdivision into three basic units-strob-pulse selection unit (strob-unit), detector signal recording units (recorders) and making decision units. The above division permits to use once constructed strob-unit and recorders in various experiments which reduces the time for designing the new system for preliminary events selection and costs for its design. The subdivision of the recording unit into few-functionally identical recorder-units allows one to synchronize various counter groups and provides the system with the required flexibility. The only unit constructed specially for the above concrete experiment is the making decisions units

[en] The LED system providing for monitoring the 1024-channel scintillation hodoscope operation, is described. It allows to check not only individual detection channel, but to check the operation of all electronics. 3 refs.; 6 figs

[en] Main parameters of the MECL RAM-based delay and detection module DD-00 for nanosecond pulses is described and its main parameters are considered. Such modules can be used for PMs' signal detection and for digitization of the data from proportional and drift detectors

[en] The authors report on experience in creating a system for preselection of events for experiments on Sigma and GAMS spectrometers. The modular structure of the system allows it to be used effectively in various experiments. The operation of the main units of the system is examined by specific examples and some of the more typical circuits are given

[en] A light-emitting-diode system is described which allows one to test both individual channels and the entire electronic system of 1024-channel scintillation hodoscope. 3 refs., 6 figs

[en] This paper justifies the choice of the photomultiplier tube and describes the structure of the photomultiplier's voltage divider and the hodoscope power-supply system. A feature of the divider is that the limiting amplifier which has a sensitivity threshold of 80 μA, is mounted on the same board

[en] The DD-OO module for delay and recording of nanosecond pulses is described, which is based on integrated circuit (100-MHz) random-access memories. These modules can be used for recording of photomultiplier signals and digitization of data from proportional and drift detectors

[en] Experience in development of the system for preliminary selection of events for experiments on the ''Sigma'' and the GAMS spectrometers is generalized. The unit structure of the system permits to effectively use it in different experiments. Selection of events is carried out at two levels in the described syste. Signals from a small number (<=12) of detectors are analyzed at the first level during extremely short time period, only simplest algorithms are used for this purpose. Time synchronization signal (strobe-pulse) and blocking signal are generated in case of positive solution. At the second level signals from detectors are remembed by trigger strobe pulse, then these data are analyzed aiming at recording of the given event. The considered system is under operation since 1974 at the IHEP accelerator and it appeared convinient and reliable in operation

[en] Flow diagram of voltage divider for photomultiplier used in scintillation multichannel hodoscope is described. The suggested diagram of the divider allows to optimize potential distribution at the innput chamber (photocathode - modulator - first dynode) and in the tail segment of the divider (the nineth dynode-anode). Adjustment of high voltage is conducted using multirotational potentiometer switched in series with the divider. Amplifier-limiter with 80 mkA threshold set at voltage comparator is placed at divide plate. Threshold of its sensitivity constitutes 80 mkA. Hodoscope supply system consists of supply sources of comparators (+-6V) four sources of auxiliary supply sources of the last dynodes of photomultipliers and high-voltage source. Current consumption constitutes 25 A by - 6V, 23 A by + 6 V for the whole hodoscope and up to 200 mA from high-voltage source for one plane. Additional charging sources have constant consumption equal to ∼ 20 mA