G.A. Cheremukhina

X-ray detectors for structure investigations constructed at JINR

Abstract The performance characteristics of a few high resolution position-sensitive detectors constructed at JINR are presented. The detectors supplied with original software operate with an IBM PC/AT. One of these devices has been succesfully applied for protein molecule structure investigations and the other for studies of the structure-forming process during combustion. The preliminary parameters of the high count rate MWPC with parallel electronics and the testing results of the microstrip detector are given.

Test results of the parallax-free X-ray area detector SD-1000 in the diffractometer CARD-7

Abstract A parallax-free X-ray area detector with a spherical Be-window has been tested in a diffractometer. The detector provides a DQE of ∼80% (8–17 keV), a parallax-free solid angle of 50°, and accuracies of 1% for the intensity and of 0.025° for the angle.

Time-Projection Chamber for the MPD NICA project

The Time-Projection Chamber (TPC) is the main device for tracking and identification of charged particles in the MPD experiment at the NICA collider. The article presents the design consideration of this detector for registration of central Au-Au collisions at energies up to 11 Gev/c and NICA event rate of 5 kHz. The status of the TPC construction and features of its main parts (field cage, read-out chambers, front end electronics, gas and cooling systems, laser-calibration) are described.

Parallax-free X-ray area detector with high spatial resolution

The new parallax-free X-ray 2D detector (SD-1000) with the pixel array of 1024 × 1024 has been designed and tested. This detector is the basic element of the X-ray diffractometer which is constructed for the investigation of biological macromolecules, viruses, liquid crystals and powders. The first test results are presented.

The development and utilization of multiwire coordinate detectors for an express-analysis of labelled compounds in thin layer chromatography

Abstract Characteristics of multiwire position sensitive chambers for an express-analysis of labelled compounds in thin layer chromatography are described. The analysis is characterized by a relatively high detection sensitivity, good data reproducibility and high spatial resolution.

Readout system of TPC/MPD NICA project

The time-projection chamber (TPC) is the main tracking detector in the MPD/NICA. The information on charge-particle tracks in the TPC is registered by the MWPG with cathode pad readout. The frontend electronics (FEE) are developed with use of modern technologies such as application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), and data transfer to a concentrator via a fast optical interface. The main parameters of the FEE are as follows: total number of channels, ~95 000; data stream from the whole TPC, 5 GB/s; low power consumption, less than 100 mW/ch; signal to noise ratio (S/N), 30; equivalent noise charge (ENC), <1000e– (Cin = 10–20 pF); and zero suppression (pad signal rejection ~90%). The article presents the status of the readout chamber construction and the data acquisition system. The results of testing FEE prototypes are presented.

MWPC-Based Automatic Systems for Electronic Autoradiography

Several systems based on multiwire proportional chambers (MWPC) used to study protein mixtures labelled with 3H, 14C, 32P, 35S and 125I are described. The detector operates on-line with a computer. Autoradiography imaging is presented on a colour TV-monitor. The spatial resolution of the systems is 1 … 2 mm, and the sensitivity is about 10 pCi/cm2. The systems make it possible to reduce the analysis time by a factor of 100 as compared to the conventional radiography of protein mixtures without destroying the sample. The high sensitivity of the systems allows the required amount of protein to be decreased by two orders of magnitude.

A high resolution gamma camera based on a multiwire position-sensitive detector

Abstract Information is presented on parameters of a gamma camera for γ-ray detection over a range of 50–100 keV. A multiwire proportional chamber used as a detector is filled with a 90% xenon-10% methane mixture at a pressure of 5 atm. The data are read out by means of electromagnetic delay lines. The efficiency of the detector for this energy range is 25–40%. The intrinsic spatial resolution is no worse than 1.5 mm for 60 keV photons and the central field of view. The sensitive area is 270 × 270 mm 2 , the central field of view 240 × 240 mm 2 . Results of testing the gamma camera are presented. The work has been performed at the High Energy Laboratory, JINR.

TPC status for MPD experiment of NICA project

In a frame of the JINR scientific program on study of hot and dense baryonic matter a new accelerator complex Ion Collider fAcility (NICA) based on the Nuclotron-M is under realization. It will operate at luminosity up to 1027 cm−2s−1 for Au79+ ions. Two interaction points are foreseen at NICA for two detectors which will operate simultaneously. One of these detectors, the Multi-Purpose Detector (MPD), is optimized for investigations of heavy-ion collisions. The Time-Projection Chamber (TPC) is the main tracking detector of the MPD central barrel. It is a well-known detector for 3-dimensional tracking and particle identification for high multiplicity events. The conceptual layout of MPD and detailed description of the design and main working parameters of TPC, the readout system based on MWPC and readout electronics as well as the TPC subsystems and tooling for assembling and integration TPC into MPD are presented.

Readout Electronics for the TPC Detector in the MPD/NICA Project

The article is aimed at describing the development status, design features and advanced version of the TPC data readout system.