[en] Various preconceptual designs of the molten lead-bismuth target of 1 5-MW power as well as a basic detailed engineering design of 1-MW power for the conditions of the LANSCE accelerator were performed. The following topics are discussed: some designs of molten lead-bismuth targets; problems of development of molten lead-bismuth targets (the window problem, windowless target); radiation safety and the activity of polonium; coolant technology; accelerator beam trips; residual energy deposition; emergency situations; scientific aspects of molten lead-bismuth target substantiation; and lead and mercury as alternative coolants. (P.A.)

[en] This report outlines the main design approaches and some calculation results on justification of conceptual design of lead-bismuth target complex developed in 2000 within the framework of the ISTC Project 1762, task B. The complex was designed for operation in demonstration ADS with 200 kW proton beam (E_p = 600 MeV, I_p = 0.33 mA)

[en] A modular liquid argon (LAr) Time Projection Chamber (TPC) with pixelated charge readout is considered as a part of the near-detector for the Deep Underground Neutrino Experiment (DUNE) [1]. Such a TPC is being developed by the ArgonCube collaboration [2]. To provide a trigger for the data acquisition (DAQ) of a neutrino event the LAr scintillation light detection is proposed. The light is a vacuum ultraviolet (UV) with 128 nm wavelength, thus, it is a challenge to register it. The main requirements imposed on the light detection system are a good performance at cryogenic temperatures, non-conductive materials, compact dimensions, and a detection efficiency at a level of percent. A Light Collection Module (LCM) as a candidate for the system has been developed at Joint Institute for Nuclear Research (JINR) in Dubna, Russia. The LCM is based on the wavelength-shifting (WLS) fibers that are coated with Tetraphenyl Butadiene (TPB) and read out by silicon photomultipliers (SiPM). Also at JINR, a full readout chain for the light detection system has been developed, consisting of the front-end electronics, power-supply for the SiPMs, and the DAQ. A cryogenic test setup has been built at JINR to study the performance of the LCM in LAr. A similar study was carried out in the laboratory for high energy physics of Bern University with highly purified LAr. These studies have shown that the photon detection efficiency (PDE) of the LCM for the LAr scintillation light is about 1–2%. Further tests in the ArgonCube prototype TPC will provide the real performance of the LCM system with a full readout chain.

[en] By methods of optic and transmission electron diffraction microscopy the structure-phase states evolution of surface layers’ head of differentially hardened rails to the depth up to 10 mm along the fillet after the passed tonnage of 691.8 mln. t. brutto was examined. (paper)