Instruments and Experimental Techniques

Korotkov, S.

doi: 10.1023/A:1019774100453pmid: N/A

The results of studies of reverse switched-on dynistors (RSDs) intended for use in high-power pulse and converting devices are generalized. The basic principles of designing high-power RSD switches are analyzed. The main circuit designs of pulse and high-frequency RSD-based devices are described. The results of tests of high-voltage microsecond and submicrosecond pulse RSD generators with a pulse power of 108–1010 W and high-frequency RSD inverters with a mean power of 104–105 W are presented.

Kaschuck, Yu.; Frunze, V.; Sevast'yanov, V.; Egorov, E.

doi: 10.1023/A:1019726217291pmid: N/A

Experimental results of neutron spectrum and neutron flux measurements in a dry vertical channel of the IR-8 research nuclear reactor at the Kurchatov Institute Russian Research Center are presented. The data were obtained using five sets of various activation detectors. The spectrum was reconstructed using the KASKAD computational program used in the method of integral neutron detectors. The results obtained make it possible to optimally plan the experiments on the irradiation and study of the radiation stability of various elements of the diagnostic systems of the International Thermonuclear Experimental Reactor (ITER) in the new irradiation channel of the IR-8 research reactor.

Afonin, A.; Biryukov, V.; Galyaev, N.; Gres', V.; Grishina, S.; Zapol'skii, V.; Zelenov, B.; Kotov, V.; Maisheev, V.; Medvedev, V.; Minchenko, A.; Terekhov, V.; Troyanov, E.; Fedotov, Yu.; Chesnokov, Yu.

Ermakov, A.; Ermakov, D.; Ishkhanov, B.; Novikov, G.; Chepurnov, A.; Shvedunov, V.; Yailiyan, V.; Trower, W.; Milovanov, O.; Sobenin, N.; Karev, A.; Vorob'ev, M.; Kokorev, N.; Nevskii, P.; Titov, A.; Freidovich, I.; Skachkov, V.;

Lobanov, N.; Zinov'ev, O.

doi: 10.1023/A:1019782302270pmid: N/A

New detectors intended to record absorbed doses of neutron, gamma and X-radiation in a range of 0–1500 Mrad are described. One of these detectors is based on dibutylphthalate (DP), another is based on epoxy resin, and a СД 5-40 detector is a mixture of dibutylphthalate and epoxy resin. Experimental methods of detector calibration and for the interpretation of measured absorbed doses are given for these detectors. All three detectors cover a measured dose range of 0–30 000 Mrad. The measurement accuracy is ±10% and, in fact, does not depend on the radiation dose rate within 20–2000 rad/s at temperatures of 20–80°C. The detectors can be applied in the atomic industry, radiation biotechnology, medicine (for object radicidation), the food industry for radiation handling of foodstuffs, radiation processing of paper (for example, mail radiation processing), etc.

Akimov, V.; Akindinov, A.; Boyarinov, S.; Voloshin, K.; Vorobyev, L.; Grishuk, Yu.; Zagreev, B.; Kats, M.; Kiselev, S.; Kuleshov, S.; Martemiyanov, A.; Mikhailov, K.; Polozov, P.; Pozdnyakov, S.; Serov, V.; Smirnitsky, A.; Surin, V.;

Talanov, V.

doi: 10.1023/A:1019786403179pmid: N/A

The formation of the secondary-radiation field in the central region of the future LHCb experiment at LHC (CERN) was numerically simulated. The specific features of the field characteristics were revealed for different configurations of detectors in the experiment. The radiation loads governing the detector operation in a given radiation environment were evaluated. Methods for optimizing the design of the detectors and the accelerator vacuum chamber were proposed.

Azhgirei, I.; Talanov, V.

doi: 10.1023/A:1019738520017pmid: N/A

The forward radiation shielding of the CMS detector is developed for the LHC by the Institute for High-Energy Physics. The efficiency of this shielding is analyzed on the basis of the results of numerical simulation. The computed particle-flux densities are compared to those of the ideal model of the shielding. The secondary-radiation field near the detector is investigated with different configurations of the shielding. Measures for reinforcing the shielding of the detector's experimental zone are proposed. The possibilities of improving the shielding structure and the composition of its materials are discussed.

Sorokin, A.

doi: 10.1023/A:1019790504088pmid: N/A

Most modern PCs have an enhanced parallel port (EPP), which allows data exchange between the PC and laboratory instruments at a rate of several hundreds of kilobytes per second with minimal additional efforts. The operation of a parallel port in this mode is considered here. An 8-bit controller circuit for interfacing with a PC using an EPP and for automation of relatively simple experiments is presented. Software examples are given

Shkelev, E.; Yastrebov, I.; Shuleshov, A.

doi: 10.1023/A:1019742620926pmid: N/A

The digital analyzer is a part of a multichannel modulation-type radiometric detector intended for studying radiation lines of impurity gases in the Earth's atmosphere in a frequency range of 96–110 GHz. The signal passing through one of the radiospectrometer's analog filtering channels is digitized at an intermediate frequency of 30 MHz. A digital filtering algorithm based on the quadrature conversion is described. Software implementing this algorithm was developed. The structure of the input system and the interface between the analog-to-digital converter and the control computer are described. A distinct feature of the interface is its 32-Kbyte buffer memory. The test results are presented.